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Manual Agilent Technologies U1251A

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  • Agilent Technologies U1251A - page 1

    Agilent T echnologies Agilent U1251A and U1252A Handheld Digital Multimeter User’ s and Service Guide ...

  • Agilent Technologies U1251A - page 2

    II Agilent U1251A/ U1252A User’s an d Service Guide Notices © Agilent T echnologies, Inc. 2006 – 2012 N o p a r t o f t h i s m a n u a l m a y b e r e p r o d u c e d i n any form or by any means (including elec- tronic storage and retrieval or translation into a foreign language) without prior agree- ment and written consen t from Agilent T ...

  • Agilent Technologies U1251A - page 3

    Agilent U1251A/U 1252A User’s and Service Guide III Safety Symbols The following symbol s on the instrument and i n the docu mentation in dicate precautions which must be taken to maintain safe operation of the instrume nt. Category III 1000 V overvolt age protection Category IV 600 V overvoltage protection Equipment prot ected through out by dou ...

  • Agilent Technologies U1251A - page 4

    IV Agilent U1251A/U1252A Us er’s and Service Guide Safety Information This meter is safety-certified in compliance with EN/IEC 61010-1:2001, UL 6101 0-1 Second Edition and CAN/CSA 22.2 61010-1 Second Edition, CA T III 1000 V/ CA T IV 600 V Overvoltage Protection, Po llution Degree II. Use with standard or compatible test probes. General Safety In ...

  • Agilent Technologies U1251A - page 5

    Agilent U1251A/U 1252A User’s and Service Guide V W ARNING • When working above 7 0 VDC, 33 VAC RMS or 46.7 V peak, exercise caution – such range pose a shock hazard. • Do not measure more th an the rated volt age (as marked on the meter) between terminals, or between te rminal and earth ground. • Double-check the meter’ s operation by ...

  • Agilent Technologies U1251A - page 6

    VI Agilent U1251A/U1252A Us er’s and Service Guide CAUTION • T urn off the circuit power and discharge all hi gh- volta ge capacitors in th e circuit be fore you perform resistance, continuity , diodes, or capacitance tests. • Use the correct termi nals, function, and range for your measureme nts. • Never measure voltage wh en current measu ...

  • Agilent Technologies U1251A - page 7

    Agilent U1251A/U 1252A User’s and Service Guide VII Regulatory Markings The CE mark is a registered trademark of the European Community. This CE mark shows that the product compl ies with all the re levant Europ ean Legal Directives. The C-tick mark is a regi stered trademar k of the Sp ectrum Management Agency of Australia. This signifies c ompl ...

  • Agilent Technologies U1251A - page 8

    VIII Agilent U1251A /U1252A User’s and Service Guide W aste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This af fixed produ ct label indicate s that you must not discard this electrical/ele ctronic produc t in domestic household waste. Product C ...

  • Agilent Technologies U1251A - page 9

    Agilent U1251A/U 1252A User’s and Service Guide IX In This Guide… 1G e t t i n g S t a r t e d This chapter contains information on the Agilent U1251A and U1252A handheld multimete r front panel, rotar y switch, keypad, disp lay , ter minals and rear panel. 2 Making Measurements This chapter contains information on h ow to make measurements usi ...

  • Agilent Technologies U1251A - page 10

    X Agilent U1251A/U1252A Us er’s and Service Guide Declaration of Conformity (DoC) The Declaration of C onformity (DoC) for this instrument is available on the W e b site. Y ou can search the DoC by its product model or description. http://regulations.corp orate .agilent.com/DoC/search.htm NOTE If you are unable to search for the re spective DoC, ...

  • Agilent Technologies U1251A - page 11

    III Abbreviated Book Title Variab le (Edit this) XIII Contents 1 Getting Started Introducing the U12521A/U1252A Handheld Digital Multimeter 2 Check the shipment 3 Adjusting the tilt-stand 4 The rear panel at a glance 7 The keypad at a glance 9 The display at a glance 11 Selecting display with the Hz but ton 16 Selecting display with the Dual button ...

  • Agilent Technologies U1251A - page 12

    XIV Abbreviated Book Title Variab le (Edit this) III Overload alert 47 Input warning 47 Charge terminal alert 48 3 Functions and Features Dynamic Recording 50 Data Hold (T rigger Hold) 52 Refresh Hold 53 Null (Relative) 55 Decibel Display 57 1 ms Peak Hold 59 Data Logging 61 Manual logging 61 Interval logging 63 Reviewing logged data 65 Square W av ...

  • Agilent Technologies U1251A - page 13

    III Abbreviated Book Title Variab le (Edit this) XV Setting Beep Frequency 87 Setting Backlight Timer 88 Setting Baud Rate 89 Setting Pari ty Check 90 Setting Data Bit 91 Setting Echo Mode 92 Setting Print Mode 93 Returning to Default Factory Settings 94 5 Maintenance Introduction 96 General maintenance 96 Battery replacement 96 Storage considerati ...

  • Agilent Technologies U1251A - page 14

    XVI Abbreviated Book Title Variab le (Edit this) III T esting the display 115 Current terminal test 116 Charge terminal alert test 117 T est Considerations 118 Calibration Security 119 Performance V erification T ests 120 Unsecuring the instrument for calibration 128 Calibration process 131 Using the front panel for adjustments 132 Adjustments Cons ...

  • Agilent Technologies U1251A - page 15

    III Abbreviated Book Title Variab le (Edit this) XVII Peak Hold Specifications 159 Frequency Counter Spec ifications for U1252A 160 Square W ave Output for U1252A 161 Operating Specifications 162 Display update rate (approximate) 16 2 Input impedance 163 ...

  • Agilent Technologies U1251A - page 16

    XVIII Abbreviated Book Title Variab le (Edit this) III ...

  • Agilent Technologies U1251A - page 17

    Abbreviated Book Title Variab le (Edit this) IX List of Figures Figure 1-1 Tilt-stand at 60° 4 Figure 1-2 Tilt-stand at 30° 4 Figure 1-3 Tilt-stand at hanging position 5 Figure 1-4 U1252A front panel 6 Figure 1-5 Rear panel 7 Figure 1-6 Rotary switch 8 Figure 1-7 U1252A keypad 9 Figure 1-8 Display symbols 11 Figure 1-9 U1252A connector terminals ...

  • Agilent Technologies U1251A - page 18

    X Abbreviated Book Title Variab le (Edit this) Figure 3-8 Full Log 62 Figure 3-9 Interval (Automatic) logging mode operation 64 Figure 3-10 Log review mode operation 66 Figure 3-11 Frequency adjustment for square wave output 68 Figure 3-12 Pulse width adjustment for square wave output 69 Figure 3-13 Duty cycle adjustment for Square Wave 70 Figure 3 ...

  • Agilent Technologies U1251A - page 19

    II Abbreviated Book Title Variab le (Edit this) XI List of T ables Ta b l e 1 - 1 Rotary switch description and functions 8 Ta b l e 1 - 2 Keypad desciption and functions 9 Ta b l e 1 - 3 General display symbols 12 Ta b l e 1 - 4 Priamry display symbols 13 Ta b l e 1 - 5 Secondary display symbols 14 Ta b l e 1 - 6 Analog bar range and counts 15 Ta ...

  • Agilent Technologies U1251A - page 20

    XII Abbreviated Book Title Variab le (Edit this) II Ta b l e 7 - 7 U1252A true RMS ac+dc current specifications 155 Ta b l e 7 - 8 Capacitance specifications 156 Ta b l e 7 - 9 Temperature specifications 156 Ta b l e 7 - 1 0 Frequency specifications 157 Ta b l e 7 - 1 1 Duty cycle and pulse width specifications 157 Ta b l e 7 - 1 2 Frequency sensit ...

  • Agilent Technologies U1251A - page 21

    1 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 1 Getting Started Introducing the U12521A/U1252A Hand held Digital Multimeter 2 Check the shipment 3 Adjusting the ti lt-stand 4 The front panel at a gl ance 6 The rear panel a t a glance 7 The rotary switc h at a glance 8 The keypad at a gl an ...

  • Agilent Technologies U1251A - page 22

    2 Agilent U1251A/U1252 A User’s and Service Guide 1 Getting Start ed Tutorial Introducing the U12521A/U1252A Handheld Digital Multimeter K ey features of this dig it al multimet er: • DC, A C, and A C + DC (U1252A only) v olt age and cur rent measurements. • Tr ue- RMS measurement for both A C v o ltage and current • Rechargeable Ni- MH bat ...

  • Agilent Technologies U1251A - page 23

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 3 Check the shipment V erify that you ha ve receiv ed the follo wing items with your multimeter : • 9 V alkaline batter y (f or U1251A only) • Soft car r ying case • 4 mm probes • Te s t l e a d s • Alligator clips • SMT grabbers • Fine tips test probes • ...

  • Agilent Technologies U1251A - page 24

    4 Agilent U1251A/U1252 A User’s and Service Guide 1 Getting Start ed Tutorial Adjusting the tilt-stand T o adj ust the meter to a 60 ° standin g position, pull t he tilt- stand outwards to its maximum reach. Figure 1-1 Ti lt-stand at 60 ° T o adj ust th e meter to a 30 ° standing position, bend the tip of the stand so tha t it i s para llel to ...

  • Agilent Technologies U1251A - page 25

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 5 T o ad just the m eter to a h ang ing p osit ion fo llo w the ste ps sho wn in Figu re 1- 3 below . Figure 1-3 Ti lt-stand at hanging position 3. Flip the tilt-stand over until this sid e of the stand is facing the device instea d of facing you. 2. Deta ch the tilt -sta ...

  • Agilent Technologies U1251A - page 26

    6 Agilent U1251A/U1252 A User’s and Service Guide 1 Getting Start ed Tutorial The front panel at a glance Figure 1-4 U1252A front panel Display Keypad Rotary switch Te r m i n a l Connectors ...

  • Agilent Technologies U1251A - page 27

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 7 The rear panel at a glance Figure 1-5 Rear panel IR communication port Battery access cover Te s t p r o b e holders Til t -s t a nd ...

  • Agilent Technologies U1251A - page 28

    8 Agilent U1251A/U1252 A User’s and Service Guide 1 Getting Start ed Tutorial The rotary switch at a glance Figure 1-6 Rotary swi tch Ta b l e 1 - 1 Rotary swi tch descrip tion and f unctions No. Description/Function 1C h a r g e m o d e ( U1252A only) or OFF 2 AC voltage 3 AC voltage, DC voltage or DC+AC voltage ( U1252A only) 4 DC mV , AC mV , ...

  • Agilent Technologies U1251A - page 29

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 9 The keypad at a glance The operation of each ke y is sho w n belo w . Pressin g a k ey illuminates a related symbol on t he display and em its a beep fr om the multi meter . Turn ing the rotary sw itch to ano ther position resets the cur rent operation of the key. Fig u ...

  • Agilent Technologies U1251A - page 30

    10 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Button Function when pressed for less than 1 second Function when pressed for more than 1 second 4 scrolls through the measurin g function(s) at a particular rotary switch positi on. enters Log Review mode. Press to switch to manual or interval logging data. Press or t ...

  • Agilent Technologies U1251A - page 31

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 11 The display at a glance T o view the full display (wit h all segments illuminated), press and hold the button while turning t he rotar y switch from OFF to any non- OFF posi tion. Af t er you ha ve finished viewing the full display , pr ess any button to resume normal ...

  • Agilent Technologies U1251A - page 32

    12 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Ta b l e 1 - 3 General display symbols LCD symbol Description Remote control Thermocouple types: (K-type) (J-type) NULL Null math function Diode / Audi ble continuity Audible continuity for resistanc e View mode for checking logged data Data logging indication Square w ...

  • Agilent Technologies U1251A - page 33

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 13 The primar y display signs are explained belo w . Ta b l e 1 - 4 Priamry display symbols LCD symbol Description Auto range AC + DC DC AC Polarity , digits, an d decimal points for pri mary display dBm Decibel unit relative to 1 mW dBV Decibel unit relative to 1 V MkHz ...

  • Agilent Technologies U1251A - page 34

    14 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial The secondar y display signs are explained belo w . The analog bar emulates the need le on an analog multimeter , without dis playing the o vershoot. When measuring peak or null adjustments and vie wing fast- changing inputs, the bar graph pro vides a useful ind icatio ...

  • Agilent Technologies U1251A - page 35

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 15 The “+” or “–” sign is indicated when the positive or negative value has been measured or calc ulated. Each segment represents 2500 or 50 0 counts depending on t he range indicat ed on t he peak b ar g raph. See t he Table 1- 6 belo w . Ta b l e 1 - 6 Analog ...

  • Agilent Technologies U1251A - page 36

    16 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Selecting display with the Hz button The frequency measureme nt fe ature helps to det ect the presence of harm onic cur rents in neutral conduct ors and deter mines whet her the se neutral curre nts are the result of unbalanced phases or non- linear loads. Press to acc ...

  • Agilent Technologies U1251A - page 37

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 17 (AC + DC voltage) [for U1252A] Frequency (Hz) AC + DC mV Pulse width (ms) Duty cycle (%) (AC Current) Frequency (Hz) AC µA Pulse width (ms) Duty cycle (%) (DC current) Frequency (Hz) DC µA Pulse width (ms) Duty cycle (%) (AC + DC current) [for U1252A] Frequency (Hz) ...

  • Agilent Technologies U1251A - page 38

    18 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Selecting display with the Dual button Press to select dif ferent combinations of dual display. Normal sing le display resumes after you press and hold f or more than 1 second. See Table 1- 8 belo w . Ta b l e 1 - 8 Selecting disp lay with the Du al button Rotary switc ...

  • Agilent Technologies U1251A - page 39

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 19 (AC + DC voltag e) AC + DC mV Hz (AC coupling) dBm or dBV AC + DC mV AC + DC mV AC mV AC + DC mV DC mV AC + DC mV Ambient t emperatur e ° C or ° F (DC current) DC μ A Hz (DC co upling) DC μ AA C μ A DC μ A Ambient t emperature ° C or ° F (AC curren t) AC μ A H ...

  • Agilent Technologies U1251A - page 40

    20 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial Selection display with the Shift button The table below sho ws selection of primar y display , wit h respect to measuring function (r otar y switch position), using the SHIFT butt on. (AC + DC current) [for U1252A] AC + DC A Hz (A C coupling) AC + DC A AC A AC + DC A D ...

  • Agilent Technologies U1251A - page 41

    Getting Started Tutorial 1 Agilent U125 1A/U1252A User ’s and Service Guide 21 for U1252A (AC + DC V oltage) DC mV AC mV AC + DC mV Ω (Resistance) Ω Ω nS (Diode T est and Frequency) Diode Hz / TEMP (Capacitance and T emperature) Capacitance T e mperature (AC Current) DC μ A AC μ A AC + DC μ A [for U1252A] (DC Current) DC mA AC mA AC + DC mA ...

  • Agilent Technologies U1251A - page 42

    22 Agilent U1251A/U1252A Us er’s and Service Guide 1 Getting Start ed Tutorial The terminals at a glance Figure 1-9 U1252A connector terminals W ARNING T o avoid damaging the multimeter , do not exceed the input limit. T able 1-10 T erminal connections for diff erent measuring fu nctions Rotary switch position Input terminal s Overload protection ...

  • Agilent Technologies U1251A - page 43

    23 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 2 Making Measurements Understanding The Measu rement Instructions 24 Measurin g V oltage 24 Measurin g AC v oltage 25 Measuring DC voltage 26 Measuring Current 27 µA & mA measurement 27 Percentage scale of 4 mA to 20 mA 29 A (ampere) meas ...

  • Agilent Technologies U1251A - page 44

    24 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Understanding The Measurement Instructions When making measurements, f ollow the numerical steps labelled in the diag rams. Refer to Table 2- 1 belo w for a description of the steps. Measuring V oltage The U1251A and U1252A offer true- RMS readings f or A C measurements that ...

  • Agilent Technologies U1251A - page 45

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 25 Measuring AC voltage Set up the multimeter t o measure A C voltage as sho wn in Fig ure 2- 1 . Pr obe the te st poi nts and re ad the d ispl a y. Figure 2-1 Measurin g AC v oltage Red Lead Black Lead NOTE Press to display frequency on secondary displa y . See Ta b l e 1 - 8 ...

  • Agilent Technologies U1251A - page 46

    26 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Measuring DC voltage Set up the multimeter to measure DC v olt age as sho wn in Fig ure 2- 2 . Pr obe the te st poi nts and re ad the d ispl a y. Figure 2-2 Measuring DC voltage Red Lead Black Lead MAX ...

  • Agilent Technologies U1251A - page 47

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 27 Measuring Current µA & mA measurement Set up the multim eter to measure μ A & mA as sho wn in Fig ure 2- 3 . Pr obe the te st poi nts and re ad the d ispl a y. NOTE • Press if necessary to ensure is shown on the display. • For μ A measurement, set the rotary s ...

  • Agilent Technologies U1251A - page 48

    28 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-3 Measuring μ A and mA current Red Lead Black Lead ...

  • Agilent Technologies U1251A - page 49

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 29 Percentage scale of 4 mA to 20 mA Set up the multimeter to measure per centage scale as sho wn in Fig ure 2- 4 . Pr obe the te st p oin ts an d read the d isp lay . The percentage scale for 4 mA to 20 mA or 0 mA to 20 mA is set to two ranges as follo ws: NOTE • Press to se ...

  • Agilent Technologies U1251A - page 50

    30 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-4 Measuring scale of 4-20 mA Red Lead Black Lead ...

  • Agilent Technologies U1251A - page 51

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 31 A (ampere) measurement Set up the multimet er to measure A (ampere) as sho wn in Fig ure 2- 5 . Pr obe the te st poi nts and re ad the d ispl a y. Figure 2-5 A (ampere) current measuremen t NOTE Connect the red and black test le ads to the 10 A input terminal A and COM respe ...

  • Agilent Technologies U1251A - page 52

    32 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Frequency Counter Set up t he multimet er to measure freque ncy as shown in Fig ure 2- 6 . Pr obe the te st poi nts and re ad the d ispl a y. W ARNING • Use the frequency counter for low vo ltage applications onl y . Never use the frequency counter for line power system. ? ...

  • Agilent Technologies U1251A - page 53

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 33 Figure 2-6 Measuring frequency Hz Red Lead Black Lead ...

  • Agilent Technologies U1251A - page 54

    34 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Measuring Resistance, Conductance and T esting Continuity Set up the multimeter t o measure resistance as shown in Fig ure 2- 7 . Then probe the test points (by shunting the resistor) and read t he displa y. Figure 2-7 Measuring resistance CAUTION Disconnect th e circuit pow ...

  • Agilent Technologies U1251A - page 55

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 35 Press t o scroll through audible continuity , conductance and resistance t ests as sho wn in Table 2- 8 . Figure 2-8 Audible con tinuity , conductance, and resistance tes t. MAX Press SHIFT Press SHIFT Audible continuity Press ...

  • Agilent Technologies U1251A - page 56

    36 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Audible contin uity In the range of 0–500 Ω , the beeper will sound if the resistance value falls below 10 Ω . F or ot her ranges, t he beeper will sound if t he resi st ance falls belo w t he typical values indicated in Table 2- 3 belo w . Conductance Set up the m ultim ...

  • Agilent Technologies U1251A - page 57

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 37 Figure 2-9 Conducta nce measure ment Ω nS Red Lead Black Lead MAX ...

  • Agilent Technologies U1251A - page 58

    38 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Te s t i n g D i o d e s T o tes t a di ode, tu rn the po we r o ff to th e cir cui t an d rem o ve the diode from t he circuit. Set up the multim eter as shown in Figure 2- 10 , then use the red probe lead on the positiv e term inal (anode) and use th e black probe le ad on ...

  • Agilent Technologies U1251A - page 59

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 39 Figure 2-10 Measuring forward bias of diode Red Lead Black Lead Hz ...

  • Agilent Technologies U1251A - page 60

    40 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-11 Measuring revers e bias of diode Red Lead Black Lead Hz ...

  • Agilent Technologies U1251A - page 61

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 41 Measuring Capacitance The meter measures capaci tanc e by charging the capacit or with a known current f or a period of time, measuring the v oltage and then calculating the capacitance. The larger the capacitor , t he longer t he charge time. Below are some tips for measuri ...

  • Agilent Technologies U1251A - page 62

    42 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-12 Capacitance measurements Red Lead Black Lead TEMP ...

  • Agilent Technologies U1251A - page 63

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 43 Measuring T emperature The bead type thermocouple probe is suitable for making temperature measurements betw een –20 °C to 200 °C in PTFE compatible envir onments. Do not use the bead- type t hermocouple probe be yond the recommended operating temperature range . Do not ...

  • Agilent Technologies U1251A - page 64

    44 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements 8 F or a quick measurement, use the 0 °C compe nsation adapter to see t he temperature variation of the thermocouple sensor . The 0 °C compensation adapter assists in measuring the relative temperature immediately. Figure 2-13 Connecting the the rmal probe into the non -co ...

  • Agilent Technologies U1251A - page 65

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 45 If y ou are w orking in a const antly var ying environment, where ambient t emperatures are not constant, do t he fo l l owi n g: 1 Press to select 0 °C compensation. This giv e s a quick measurement of the relativ e t emperature. 2 A void cont act between the ther moco upl ...

  • Agilent Technologies U1251A - page 66

    46 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Figure 2-15 Surface temperature measurement TEMP ...

  • Agilent Technologies U1251A - page 67

    Making Measurements 2 Agilent U1251A/U 1252A User’s and Service Guide 47 Alerts and W arning During Measurement Overload alert The meter pro vides an ov erload aler t for v oltage measurements in both auto and manual range modes. The meter beeps periodically once the measuring voltage exceeds 1010 V . F or y o ur safety , please be aware of this ...

  • Agilent Technologies U1251A - page 68

    48 Agilent U1251A/U1252A Us er’s and Service Guide 2 Making Measurements Charge terminal alert The meter sounds an aler t beep when t he termina l detects a voltage lev el of more than 5 V and the rotar y switch is not set t o the cor responding location. The primar y display indicates a f lashing “ Ch.Err ” until t he lead is remov ed from t ...

  • Agilent Technologies U1251A - page 69

    49 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 3 Functions and Features Dynamic Recording 50 Data Hold (T rigger Hold) 52 Refresh Hold 53 Null (Relativ e) 55 Decibel Display 57 1 ms Peak Hold 59 Data Logging 61 Manual log ging 61 Interval logging 63 Reviewing logged data 65 Square W ave Ou ...

  • Agilent Technologies U1251A - page 70

    50 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Dynamic Recording The Dynamic Recor d ing mode can be used to detect inter mittent tur n- on or turn- of f voltage, current sur ges or to verify mea surement per f ormance without you being present during th e process. While the re adings are being recorded, you are free ...

  • Agilent Technologies U1251A - page 71

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 51 Figure 3-1 Dynamic recording mode operation Press Max Min for > 1 sec or press for > 1 sec Press Max Min for > 1 sec or press for > 1 sec Press Max Min for > 1 sec or press for > 1 sec Press Max Min for > 1 sec Press Max Min Press Max Min Press Max Mi ...

  • Agilent Technologies U1251A - page 72

    52 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Data Hold (T rigger Hold) The data ho ld fu nctio n all ow s the u ser to fre eze th e display ed digit al value. 1 Press to freeze th e display ed valu e and to ent er th e manual trigger mode. TR IG is display ed. 2 Press agai n to freeze the next value being measured. ...

  • Agilent Technologies U1251A - page 73

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 53 Refresh Hold The Refresh Hold function allo ws you to fre eze the disp la ye d value. The bar - g raph is not held and will continue to ref lect the inst ant aneous measured value. Y ou can u se the Setup mode to enable Refresh Hold mode when you are working with f luctua ...

  • Agilent Technologies U1251A - page 74

    54 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-3 Refresh hold mode operat ion The HOLD sign flashes until the measured value is stable and updated Press V ariation counts > setting Measurement is updated Press to return NOTE • For voltage and curr ent measureme nts, the holding va lue will not be updated ...

  • Agilent Technologies U1251A - page 75

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 55 Null (Relative) The Null function subtracts a stored value from the present measurement and displays the dif ference between the two. 1 Press to store the display ed reading as the reference value to be subtracted from subsequent mea sure ments an d to set the di spla y t ...

  • Agilent Technologies U1251A - page 76

    56 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-4 Null (relative) mode operati on Press Press Press ...

  • Agilent Technologies U1251A - page 77

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 57 Decibel Display The dBm operatio n calculate s th e pow er delivered to a reference resistance relative to 1 mW and can be applied to D C V , A C V , a n d A C + D C V m e a s u r e m e n t s f o r d e c i b e l conversion. The voltage measurement is conver ted t o dBm by ...

  • Agilent Technologies U1251A - page 78

    58 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-5 dBm/dBV display mode operation Press Press Press Press Press Press Pres s Press Press Press ...

  • Agilent Technologies U1251A - page 79

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 59 1 ms Peak Hold The P eak Hold function allo ws the measurement of peak v oltage for analysis of components such as po wer distribution transformers and pow er fact or correction capacitors. The peak voltage ob tai ned can be used t o deter- mine the crest fact or: Crest f ...

  • Agilent Technologies U1251A - page 80

    60 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-6 1 ms peak hold mode operation Press Press Press Press Press Press ...

  • Agilent Technologies U1251A - page 81

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 61 Data Logging The data logging function pro vides the convenience of recording test data for future revie w or analysis. Since data is stored in nonvolatile memor y , t he dat a remains sav ed even if the multimeter is tur ned OFF or the batt er y is changed. The tw o opti ...

  • Agilent Technologies U1251A - page 82

    62 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-7 Hand (Manual) logging mode operation Figure 3-8 Full Log Press Press NOTE The maximum data that ca n be stored is 100 entries. When the 100 entrie s are filled, the secon dary display in dicates “ FULL ”, as shown in Figure 3-8 . Press ...

  • Agilent Technologies U1251A - page 83

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 63 Interval logging Firstly , ensure t hat inte rval (time) logg ing is specif ied in Setup mode. 1 Press f or more than 1 second to store t he present value and func tion on the primar y displa y int o the non- v olatile memor y . The and the logging index will be indicated ...

  • Agilent Technologies U1251A - page 84

    64 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-9 Interval (Autom atic) logging mode operation Press Press Press ...

  • Agilent Technologies U1251A - page 85

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 65 Reviewing logged data 1 Press for more than 1 second to ente r the Log Review mode. The last recor ded en tr y and the last logging index are dis pla yed . 2 Press to switch between hand (manual) and interval (automatic ) logging review mode. 3 Pre ss to asc end o r to de ...

  • Agilent Technologies U1251A - page 86

    66 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-10 Log review mode operation Press Press Press Press Press Press Press Press Press Press Pres s Press Press Press Press Press Press Press Press ...

  • Agilent Technologies U1251A - page 87

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 67 Square W ave Output (for U1252A) The square wav e output function can be used to generat e a PWM (pulse width modulation) output or provide a synchro- nous clock sour ce (baud rate generator). Y ou can also use this f unction to check and calib rate f low- met er displays ...

  • Agilent Technologies U1251A - page 88

    68 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-11 Frequency adjustment for square wave output 5 Press t o select the pulse width (ms) on the primar y display. 6 Press or to adjust the pulse width. The pulse width can be set for 256 steps and each step is 1/ (256 x Frequency). The display range automatically a ...

  • Agilent Technologies U1251A - page 89

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 69 Figure 3-12 Pulse width adjustment for square wave output Press Press Press Press Press Press Press Press ...

  • Agilent Technologies U1251A - page 90

    70 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions Figure 3-13 Duty cycle adjustment for Square W ave ...

  • Agilent Technologies U1251A - page 91

    Features and Functions 3 Agilent U1251A/U 1252A User’s and Service Guide 71 Remote Communication The meter has a bi- directional (full duplex) communication ca pab ilit y tha t spee ds data stor ing fr om th e me ter to the PC. T o use this feature, y ou are required to use the optional IR- USB cable with t he application sof tware included in t ...

  • Agilent Technologies U1251A - page 92

    72 Agilent U1251A/U1252A Us er’s and Service Guide 3 Features and Functions ...

  • Agilent Technologies U1251A - page 93

    73 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 4 Changing The Default Setting Selecting Setup Mode 74 Setting Data Logging Mode 78 Setting Thermocouple T ypes (U1252A only) 79 Setting Reference Impeda nce for dBm Measurement 80 Setting Minimum Freque ncy Measurement 81 Setting T emperature ...

  • Agilent Technologies U1251A - page 94

    74 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Selecting Setup Mode T o ent er t he Setup mode , per form th e follo wing st eps: 1 Turn the meter OFF . 2 From the OFF position, press and hold while turning t he rotar y swit ch to any non- OFF position. T o change a menu it em setting in Setup mode, pe r form th ...

  • Agilent Technologies U1251A - page 95

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 75 T able 4-1 A v ailable settin g options in S etup mode Menu Item Available s etting options Default factor y setting Display Description Disp lay Description rHoLd [ 1 ] Refresh Hold OFF Enables Data Hold (manual trigger) 500 100–1000 Sets the variation count that ...

  • Agilent Technologies U1251A - page 96

    76 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting t.CoUP [ 3 ] Thermocouple tYPE K Sets the thermocouple type to K-type tYPE K tYPE J Sets the thermocouple type to J-type d-LoG Data logging Hand Enables manual data logging Hand 1–9999 s [ 2 ] Sets the interval for automatic data logging tEMP [ 4 ] Te m p e r a t ...

  • Agilent Technologies U1251A - page 97

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 77 Setting Data Hold/Refresh Hold Mode 1. Set OFF to en able the Dat a Hold mode (manual tr igger by k ey o r b us v ia the remo te co ntr ol). 2. Set the variation count wit hin the 100 to 1000 range to enable th e Refresh Hold mode (au to trigger). Wh en the variation ...

  • Agilent Technologies U1251A - page 98

    78 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Data Logging Mode 1 Set to “Hand” t o enable the manual dat a logging mode. 2 Set the inte rval within 0001 to 9999 seconds to enable interval (automatic) dat a logging mode. 3 Press and hold or for more than 1 second to swit ch between manual and interv ...

  • Agilent Technologies U1251A - page 99

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 79 Setting Thermocouple T ypes (U1252A only) The ther mocouple sensor types t hat can be selected ar e type- K (default) or type- J. Press or to switch betw een the J and the K type. Figure 4-3 Thermocouple type setup Press ...

  • Agilent Technologies U1251A - page 100

    80 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Reference Impedance for dBm Measurement The reference im pedance ca n be set from 1 to 9999 W . The default value is 50 W . Figure 4-4 Reference impedance for dBm measurement setup Press Press Press Press ...

  • Agilent Technologies U1251A - page 101

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 81 Setting Minimum Frequency Measurement The minimum fre quency setup inf luences the measuring rates for frequency , duty cycle, an d pulse width. The typical measuring rate defined at t he general specification is based on the minimum fre quency of 1 Hz. Figure 4-5 Mi ...

  • Agilent Technologies U1251A - page 102

    82 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting T emperature Unit F our combination displays are a vailable: • Celsius only ( ° C on primary display) single display setting • Celsius- Fahrenheit (d- CF) an d F a h r e n h e i t -C e l s i u s ( d -F C ) dual display setting. • Fahrenheit only ( ° ...

  • Agilent Technologies U1251A - page 103

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 83 Figure 4-6 T emp erature u nit setup Press Press Press Press Press ...

  • Agilent Technologies U1251A - page 104

    84 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Auto Power Saving Mode • The timer f or APF (Auto P ow er OFF) can be set for the range of 1 to 99 minutes. • T o act ivate the met er a f ter i t has “a uto p ow ered- off”, t urn the ro t ary swi t ch to the OFF p ositi on. T hen tu rn it b ack on ...

  • Agilent Technologies U1251A - page 105

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 85 Figure 4-7 Auto power saving set up Press Press Press Press Press ...

  • Agilent Technologies U1251A - page 106

    86 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Percentage (%) Scale Readout This setting converts the DC cur rent measuring display to percentage (%) scale readout — 4—20 mA or 0—20 mA as proportional to 0~100%. The 25% scale readout represents DC 8 mA at 4—20 mA and DC 5 mA at 0—20 mA. Figure ...

  • Agilent Technologies U1251A - page 107

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 87 Setting Beep Frequency The driving frequency can be set to 2400, 1200, 600, or 300Hz. “OFF” di sables the beep. Figure 4-9 Beep frequency setup Press Press Press Press Press Press ...

  • Agilent Technologies U1251A - page 108

    88 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Backlight T imer • The timer can be set to 1 to 99 seconds. The backlight will turn of f automatically aft er the set period. • “0FF” disables turning of f backlit automatically. Figure 4-10 Backlit timer setup Press Press Press Press Press ...

  • Agilent Technologies U1251A - page 109

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 89 Setting Baud Rate Select the baud rate for remote control. The a vailable settings are 2400, 4800, 9600, and 19200 Hz. Figure 4-11 Baud rate setup remote control Press Press Press Press Press ...

  • Agilent Technologies U1251A - page 110

    90 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Parity Check Select the parity check for remote contr ol. It can be set to none, even, or odd bit. Figure 4-12 Parity check setup Press Press Press Press ...

  • Agilent Technologies U1251A - page 111

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 91 Setting Data Bit Select the dat a bit for remote control. It can be set to eit her 8 or 7 bits. Figure 4-13 Data bit setup for remote control Press ...

  • Agilent Technologies U1251A - page 112

    92 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Setting Echo Mode • Ec ho O N enab les th e ret urn o f cha racter s to the PC in remote communication. • Ec ho O FF di sable s the r eturn o f cha racter s to the PC. Figure 4-14 Echo mode setup for remote control Press ...

  • Agilent Technologies U1251A - page 113

    Changing The Default Setting 4 Agilent U1251A/U1252A User’s and Service Guide 93 Setting Print Mode Print ON enables the printing of measured data t o the PC when the measuri ng cycle is completed. In t his mode , the meter auto matically sends the newest data t o the host continuously but does not accept an y commands from the host. f lashes dur ...

  • Agilent Technologies U1251A - page 114

    94 Agilent U1251A/U1252A Us er’s and Service Guide 4 Changing The Default Setting Returning to Default Factory Settings • Press fo r more than 1 second t o reset to t he default factor y settings all menu options ex cept the T emperature setting. • The Reset menu item aut omatically rev er ts t o Refresh Hold menu item af t er reset has taken ...

  • Agilent Technologies U1251A - page 115

    95 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 5 Maintenance Introduction 96 General mainte nance 96 Battery replacement 96 Storage consid erations 98 Charging the battery 98 Fuse checking proced ure 105 Replacing the fuse 106 T roubleshooting 108 Replaceable Pa rts 109 T o order replaceab ...

  • Agilent Technologies U1251A - page 116

    96 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance Introduction General maintenance Bes ides the a bo v e ha zard , dirt, or mo istu re in th e term ina ls can distor t readings. The steps for cleaning are as f ollows: 1 Turn the meter off and remo v e th e tes t lea ds. 2 Tur n the met er o ver and shak e out an y dir t that may ha ...

  • Agilent Technologies U1251A - page 117

    Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 97 Figure 5-1 9 V rectangular battery 1 At the rear panel, turn t he screw on the batt er y cover from the LOCK to t he OPEN position (counterclockwise). 2 Slide down the batter y c o ver . 3 Lift t he batter y co ver up. 4 Replace the spec if ied batter y. 5 Reve rse th e abov e st ep ...

  • Agilent Technologies U1251A - page 118

    98 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance Storage considerations Aft er the f irst charge, it is recommended that you fully charge the batter y periodically , ev en when it is not in use. This is because the Ni- MH rechargeable batter y pack may drain with time. Charging the battery CAUTION T o avoid instrument damage from ...

  • Agilent Technologies U1251A - page 119

    Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 99 Use the sp ecifie d 2 4 V DC ada ptor to char ge th e batt er y. Rem embe r ne ve r to tu rn the r otar y s wi tch o f the m eter when the batt er y is being charged. Use t he follo win g steps t o charge the battery: 1 Di sco nnec t the test leads fro m the mete r . 2 Tur n t he ro ...

  • Agilent Technologies U1251A - page 120

    100 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance Figure 5-2 Battery capacit y display a s trickle 5 Aft er pressing Shif t or when t he self- test st ar ts, t he mete r performs a self- test to check if the batter y in t he meter is the rechargeable type. The self- test t akes about 2 to 3 minutes. A void pressing an y bu tton du ...

  • Agilent Technologies U1251A - page 121

    Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 101 Ta b l e 5 - 2 Error messages Error Error message OL 1 No battery inside 2 Faulty battery 3 Battery is fully charged C-Err 1 If charging battery more than 12 V or less than 5 V 2 In 3 minutes, if the b attery voltag e does not go upwards then charge error ...

  • Agilent Technologies U1251A - page 122

    102 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance 6 The smar t charging mode will star t if t he meter passes the self- test. The charging ti m e is limited to not more than 220 minutes. The secondar y display will count do wn the charging time. During charging, no buttons can be pressed. The er ror message may appear during charg ...

  • Agilent Technologies U1251A - page 123

    Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 103 7 The charge end message (C–End) appears on the secondar y display once charging is completed. The trickle charging current is provided to maintain t he batter y capacity. The f las hing sig ns of and appear to sho w t he trickle st ate. 8 Remo ve the DC adapter when the C–End ...

  • Agilent Technologies U1251A - page 124

    104 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance Figure 5-6 Battery charging procedure Press ...

  • Agilent Technologies U1251A - page 125

    Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 105 Fuse checking procedure It is recommended t hat you check the fuses of the multimeter before using it. Follo w th e instr uctions below to test t he fuses inside t he multimeter . Refer to Figure 5- 8 for the respective positions of F use 1 and F use 2. 1 Set the r otar y sw itch t ...

  • Agilent Technologies U1251A - page 126

    106 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance 4 T o tes t Fuse 2 , pla ce and touch the ti p of the tes t pr obe on the r ight hal f of i npu t termi nal . En sure that the pr obe t ip touc hes the metal in sid e the in put termi nal . 5 Observe the reading on the instr ument's display. Ref er to Table 5- 3 f or t he poss ...

  • Agilent Technologies U1251A - page 127

    Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 107 6 Gently remov e t he defective fuse by pryi ng one end of t he fuse loose and removing it out of the fuse brack et. 7 Replace with a new fuse of the same size and rating. Make sure the new fuse is cent ered in the fuse holder . 8 Ens ure th at the ro t ary swi tch on the top c ase ...

  • Agilent Technologies U1251A - page 128

    108 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance T roubleshooting If the instr ument f ails to operat e, check t he batt er y and t he test leads. Replace t hem if necessar y. And if t he instru ment still does not function, check the operating procedures in this manu al. When servicing, use only specified replacement parts. Tabl ...

  • Agilent Technologies U1251A - page 129

    Maintenance 5 Agilent U1251A/U 1252A User’s and Service Guide 109 Replaceable Parts This section contains informat ion for or dering replacement parts for your instrument. you can find the instr ument suppor t part list at A gilent’s Test & Measurement P ar ts Catalog at: http://www .agilent.com/f ind/par ts The parts lists in clude a brief ...

  • Agilent Technologies U1251A - page 130

    110 Agilent U1251A/U1252A User’s an d Service Guide 5 Maintenance ...

  • Agilent Technologies U1251A - page 131

    111 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 6 Performance T ests and Calibration Calibration Overview 11 2 Closed-case elect ronic calibrat ion 112 Agilent T echnologies calibration services 112 Calibration in terval 113 Adjustment is recommended 113 Recommended T est Equipment 114 Bas ...

  • Agilent Technologies U1251A - page 132

    112 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Calibration Overview This manual contains procedures to verify the instr ument’s performance and adjustment (calibration). The performanc e test procedures allow y ou t o verify that the handheld digital multimeter is operating within its publishe d specifi ...

  • Agilent Technologies U1251A - page 133

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 113 Calibration interval A 1- year interval is adequate for most applications. A ccuracy specifications are war ranted on ly if adjustme nt is made at regular calibration int ervals. Accuracy specifications are not warrant ed bey o nd the 1- year calibration inte ...

  • Agilent Technologies U1251A - page 134

    114 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Recommended T est Equipment The test equipment recomm ended for the per formance v e r i f i c a t i o n a n d a d j u s t m e n t p r o c e d u r e s i s l i s t e d b e l o w . I f t h e exact instr ument is not available, substitute calibration standards o ...

  • Agilent Technologies U1251A - page 135

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 115 Basic Operating T est The Basic Operating Test is to test t he basic operability of the instr ume nt. Repair is required if t he instr ument fails t he Basic Operating T est. Backlit test Press the Bat button t o test t he backlight. It will moment arily togg ...

  • Agilent Technologies U1251A - page 136

    116 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Current terminal test This test dete rmines if the input warning of the cur rent termi nal tes t is fu ncti oning prop erl y. The meter sounds an aler t beep when the test lead is inser ted int o t he A ter minal but t he rot ar y swit ch is not set to mA.A f ...

  • Agilent Technologies U1251A - page 137

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 117 Charge terminal alert test This test det erm ines if t he charge t erminal ale r t is operating properly. The meter sounds an aler t when the terminal detects a voltage lev el of more than 5 V and the rotar y switch is not set t o the position. The meter soun ...

  • Agilent Technologies U1251A - page 138

    118 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration T est Considerations Long test leads can also act as antennas which may pick up A C signals. F or optimum per formance, all procedures should compl y with t he follo wing recommendations: • Ensure that t he calibration ambient t emperature is stable and is ...

  • Agilent Technologies U1251A - page 139

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 119 Calibration Security The calibration security code prevents accidental or unauthorized adjustments t o the instr ument. When you first receiv e your instrument, it is secu red. Bef ore you can adjust the instr ument, you must unsecure it b y ente ring the co ...

  • Agilent Technologies U1251A - page 140

    120 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Performance V erification T ests Us e th e P er f orman ce V erific ati on T ests to v er ify th e measurement performance of th e instrument. The performance verif ication tests use t he instrumen t’s specifications listed in t he U1251A/U1252A Data Sheet. ...

  • Agilent Technologies U1251A - page 141

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 121 Ta b l e 6 - 2 Performance ve rification test steps Step Te s t F u n c t i o n Range 5520A Output Error from nominal 1 year U1251A U1252A 1 T urn the rotar y switch to th e V position [ 1 ] 5 V 5 V , 1 kHz ± 32.5 mV ± 22.5 mV 5 V , 10 kHz ± 52.5 mV ± 22. ...

  • Agilent Technologies U1251A - page 142

    122 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Step Te s t F u n c t i o n Range 5520A Output Error from nominal 1 year U1251A U1252A 4 T urn the rotary switch to V position (for model U1252A), to V position (for model U12 51 A) 5 V 5 V ± 2 mV ± 1.75 mV 50 V 50 V ± 20 mV ± 17.5 mV 500 V 500 V ± 200 m ...

  • Agilent Technologies U1251A - page 143

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 123 Step T est Function Range 5520A Output Error from nominal 1 year U1251A U1252A 6 T urn the rot ary switch to the mV position 50 mV 50 mV ± 75 μ V [ 2 ] ± 75 μ V [ 2 ] 500 mV 500 mV ± 0.2 mV ± 0.175 mV – 500 mV ± 0.2 mV ± 0.175 mV 1000 mV 10 00 mV ± ...

  • Agilent Technologies U1251A - page 144

    124 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Step T est Function Range 5520A Output Error from nominal 1 year U1251A U1252A 8 T urn the rot ary switch to the W position 500 W 500 W ± 500 m W [ 3 ] ± 350 m W [ 3 ] 5 k W 5 k W ± 4.5 W [ 3 ] ± 3 W [ 3 ] 50 k W 50 k W ± 45 W ± 30 W 500 k W 500 k W ± ...

  • Agilent Technologies U1251A - page 145

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 125 Step T est Function Range 5520A Output Error from nominal 1 year U1251A U1252A 100.00 μ F 100 .00 μ F ± 1.05 μ F ± 1.05 μ F 1000.0 μ F 100 0.0 μ F± 1 0 . 5 μ F± 1 0 . 5 μ F 10.00 mF 10.00 mF ± 0.105 mF ± 0.105 mF 100.00 mF 10.00 mF ± 0.4 mF ± ...

  • Agilent Technologies U1251A - page 146

    126 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Notes for verificati on test: 1 The additional error to be added as fr equency > 20 kHz and sign al input < 10 % of range: 300 counts of LSD per kHz. 2 The accuracy could be 0.05% + 10 , always use r elative function to zero thermal effect (short test l ...

  • Agilent Technologies U1251A - page 147

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 127 11 The current can be measuring from 2.5 A to 10 A continuous, and the a dditional of 0.5% to spec ified accuracy as me asure the signal greater than 10 A~20 A for 30 seconds maximum. After measured current for > 10 A, to cool down the meter for 2 times of ...

  • Agilent Technologies U1251A - page 148

    128 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Unsecuring the instrument for calibration Bef ore y ou can adjust the instr ument, you must unsecure it by entering the cor rect security code. The security code is set to 1234 when the instr ument is shipped from the factor y. The security code is stored in ...

  • Agilent Technologies U1251A - page 149

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 129 T o change the instrument calibrat ion security code from the front panel 1 When th e multimet er is in t he unse cured mode, pre ss f or mo re tha n 1 secon d to en ter the Calib rati on Security Code setting mode. 2 The factor y default calibration security ...

  • Agilent Technologies U1251A - page 150

    130 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration T o unsecure the instrument without the security code T o unsecure t he instr ument without the cor rect security code, f ollo w t he steps below . 1 Record the last 4 digits of t he multi meter’s serial nu mber . 2 Turn the rotary sw itch to . 3 Press and ...

  • Agilent Technologies U1251A - page 151

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 131 No w you can use 1234 as the security code. If y ou want to enter a new security code, see “T o change the instr ument calibration security c ode from the front panel” on page 129. Make sure y ou record the new security code. Calibration process T o compl ...

  • Agilent Technologies U1251A - page 152

    132 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Using the front panel for adjustments This section describes t he procedures to per form adjustments from the front panel. Selecting the Adjustment Mode T o unsecure t he instr ument, see “U nsecuring t he instr ument fo r c a l i b r a t i o n ” on page ...

  • Agilent Technologies U1251A - page 153

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 133 Adjustments Consideration Y ou will need a test input ca ble, a connectors set, and a Shorting Plug to adjust t he instrument. A djustments f or each functi on should b e performed onl y in the o rd er sh ow n belo w . 1 Allo w t he instrument t o warm up and ...

  • Agilent Technologies U1251A - page 154

    134 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration V alid adjustment input values Adjustment can be accomplished using the follo wing input values belo w . Ta b l e 6 - 3 V alid adjustment input values Function Range V alid Amplitude Input V alues 5 V , 50 V , 500 V , 100 0 V 0.9 to 1.1 x Full Scal e V (for U ...

  • Agilent Technologies U1251A - page 155

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 135 Adjustment procedure Review the sections “Test Considerations” on page 118 and “Adjustments Consideration” on page 133 bef ore proceeding with t his procedure. 1 Tur n t he rotar y switch t o “Test Function” position as sho wn in t he adjustment t ...

  • Agilent Technologies U1251A - page 156

    136 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration 8 Press t o st ar t the adjustment. The CAL f lashes in the s econ dary di spla y to i nd ica te that th e cal ibr ation is in progress. F or an adjustment t hat is successful, the secondar y displa y will brief ly sho w P ASS. An adjustment failure is indica ...

  • Agilent Technologies U1251A - page 157

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 137 Ta b l e 6 - 4 Adjustment table Step T est Function Cal Range Input Cal Item U1251A U1252A 1 T urn the rot ary switch to the V positi on 5 V 0.3 V ,1 kHz 0.3000 V 0.3000 V 3 V , 1 kHz 3.0000 V 3.0000 V 3 V , 50 kHz N/A 3.0000 V 50 V 3 V , 1 kHz 03.00 0 V 03.0 ...

  • Agilent Technologies U1251A - page 158

    138 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Step T est Function Cal Range Input Cal Item U1251A U125 2A 3 Press button to go to the V mode 5 V 0.3 V , 1 kHz N/A 0.3000 V 3 V , 1 kHz N/A 3.0000 V 3 V , 50 kHz N/A 3.0000 V 50 V 3 V , 1 kHz N/A 03.000 V 30 V , 1 kHz N/A 30.000 V 30 V , 50 kHz N/A 30.000 V ...

  • Agilent Technologies U1251A - page 159

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 139 Step Te s t F u n c t i o n Cal Range Inpu t Cal Item U1251A U1252A 5 Press button to go to the mV mode 50 mV 3 mV , 1 kHz 03.00 0 mV 03.000 mV 30 mV , 1 kHz 30.000 mV 30.000 mV 30 mV , 50 kHz N/A 30.000 mV 500 mV 30 mV , 1 kHz 030.00 mV 030.00 mV 300 mV , 1 ...

  • Agilent Technologies U1251A - page 160

    140 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Step T est Function Cal Range Input Cal Item U1251A U1252A 7 T urn the rot ary switch to the TEMP/ position Open Input terminal open (Remove any test leads an d Short Plugs from the input terminal) oPEn oPEn 10 nF 3 nF 03.000 nF 03.000 nF 10 nF 10.000 nF 10.0 ...

  • Agilent Technologies U1251A - page 161

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 141 10 Press button to go to 500 μ A3 0 μ A,1 kHz 030.00 μ A 030.00 μ A m A mode 300 μ A,1 kHz 300.0 0 μ A 300.00 μ A 5000 μ A3 0 0 μ A,1 kHz 0300.0 μ A 0300.0 μ A 3000 μ A, 1 kHz 3000.0 μ A 3000.0 μ A 11 T urn the Rotar y Switch to th e mA.A positi ...

  • Agilent Technologies U1251A - page 162

    142 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration Finishing the adjustment 1 Remo ve all the shor ting plugs and connectors from the instrument. 2 Record the new Calibration Count. 3 Press and simult aneously to exit t he Adjustment Mode. P ow er off and on again. The instru ment will then be secured. T o re ...

  • Agilent Technologies U1251A - page 163

    Performance Tests and Calib ration 7 Agilent U1251A/U 1252A User’s and Service Guide 143 Calibration errors The follo wing errors indicate failures that may occur during a calibration. Number Recommended Accuracy Requirements 200 Calibration error: calibration mode is secured 002 Calibration error: secure code invalid 003 Calibration e rror: seri ...

  • Agilent Technologies U1251A - page 164

    144 Agilent U1251A/U1252A Us er’s an d Service Guide 7 Performance Tests and Calibration ...

  • Agilent Technologies U1251A - page 165

    145 Agilent T echnologies Agilent U1251A and U1252A Ha ndheld Digital Multimeter User’s and Service Guide 7 Specifications Product Characteristics 146 Measurement Category 149 Measurement category definition 149 Specificati on Assump tions 150 Electrical Specifications 151 DC Specifications 151 AC Specifica tions 153 AC+DC Specifications for U125 ...

  • Agilent Technologies U1251A - page 166

    146 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Product Characteristics POWER SUPPL Y Battery type: • 9 V size Ni-MH rechargeabl e battery , 7.2 V nominal voltage • 9 V size Ni-MH rechargeabl e battery , 8.4 V nominal voltage • 9 V Alkaline batt ery (ANSI/NEDA 16 04A or IEC 6LR61) • 9 V Carbon-zinc battery (ANS I/NED ...

  • Agilent Technologies U1251A - page 167

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 147 SAFETY COMPLIANCE • EN/IEC 61010- 1:2001 • ANSI/UL 6101 0-1:2004 • CAN/CSA-C22.2 No. 61010-1-04 MEASUREMENT CA TEGORY CA T III 1000 V/CA T IV 60 0 V Overvoltage Protection EMC COMPLIANCE • Certified to I EC61326-1:2 005 / EN61326-1 :2006 • CISPR 11:200 3 / EN 55011:20 ...

  • Agilent Technologies U1251A - page 168

    148 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications W ARRANTY Please refer to http://www.agilent. com/go/warranty_terms • Three years for the product • Three months for the product's stan dard accessories, unless otherwise specified Please take note that for the produc t, the warranty does not cover: • Damage from con ...

  • Agilent Technologies U1251A - page 169

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 149 Measurement Category The Agilent U1251A and U1252A Handheld Digital Multimeter has a saf ety rating of CA T III 1000 V/ CA T IV , 600 V . Measurement category definition Measurement CA T I are measurements perf ormed on circuits which are not directly connected to the A C mains. ...

  • Agilent Technologies U1251A - page 170

    150 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Specification Assumptions • The DC specifications are defined for measurements which are taken after at least 1 minute of war m- up time. • The A C and A C+DC specif ications are def ined for measurements of sine wav e and are ta ke n aft er at least 1 minute of warm- up ti ...

  • Agilent Technologies U1251A - page 171

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 151 Electrical Specifications DC Specifications Ta b l e 7 - 1 DC Accuracy ± (% of reading + Number of Least Significant Digi t) Function Range Resolution T est Current/ Burden V oltage Accuracy U1251A U1252A Vo l t a g e [ 1 ] 50.000 mV 0.001 mV - 0.05 + 50 [ 2 ] 0.05 + 50 [ 2 ] 5 ...

  • Agilent Technologies U1251A - page 172

    152 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Function Range Resolution T est Current/ Burden V oltage Accuracy U1251A U1252A Current 500.00 µA 0.01 µA 0.06 V 0.1 + 5 [ 6 ] 0.05 + 5 [ 6 ] 5000.0 µA 0. 1 µA 0.6 V 0.1 + 5 [ 6 ] 0.05 + 5 [ 6 ] 50.000 mA 0.001 mA 0.09 V 0.2 + 5 [ 6 ] 0.15 + 5 [ 6 ] 440.00 mA 0.01 mA 0.9 V ...

  • Agilent Technologies U1251A - page 173

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 153 AC Specifications AC specifications for U1251A Ta b l e 7 - 2 U1251A accuracy specifications ± (% of reading + number of LS D ) for true RMS AC voltage Function Range Resolution Frequency 30 Hz to 45 Hz 45 Hz to 1 kHz 1 kHz to 10 kHz 10 kHz to 30 kHz Vo l t a g e [ 1 ] 50.000 m ...

  • Agilent Technologies U1251A - page 174

    154 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications AC specifications for U1252A Ta b l e 7 - 4 U1252A accuracy specifications ± (% of reading + number of LS D ) for true RMS AC voltage Function Range Resolution Frequency 20 Hz – 45 Hz 45 Hz – 1 kHz 1 kHz – 10 kHz 10 kHz – 20 kHz 20 kHz – 100 kHz [ 1 ] Vo l t a g e [ ...

  • Agilent Technologies U1251A - page 175

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 155 AC+DC Specifications for U1252A Ta b l e 7 - 6 U1252A true RMS ac+dc voltage specifications Function Range Resolution Frequency 30 Hz – 45 Hz 45 Hz – 1 kHz 1 kHz – 10 kHz 10 kHz – 20 kHz 20kHz – 100kHz [ 1 ] Vo l t a g e [ 2 ] 50.000 mV 0.001 mV 1.5 + 80 0.4 + 60 0.7 + ...

  • Agilent Technologies U1251A - page 176

    156 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Capacitance Specifications T emperature Specifications Ta b l e 7 - 8 Capacitance specifications Function Range Resolution Accuracy ± (% of reading + Offset Erro r) Display update rate (approx) Capacitance 10.000 nF 0.001 nF 1 % + 8 4 times/sec. 100.00 nF 0.01 nF 1 % + 5 1000. ...

  • Agilent Technologies U1251A - page 177

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 157 Frequency Specifications Duty Cycle and Pulse Width Specifications T able 7-10 Frequency specifications Range Resolution Accuracy ± (% of reading + No. of Least Significant D igit) Min. Input Frequency 99.999 Hz 0.001 Hz 0.02% + 3 < 600 kHz 1 Hz 999.99 Hz 0.01 Hz 9.9999 kHz ...

  • Agilent Technologies U1251A - page 178

    158 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Frequency Sensitivity Specifications For voltage measu rements T able 7-12 Frequency se nsitivity and tr igger leve l specificatio ns for voltag e measurement s Input range [ 1 ] Minimum sensitivit y (RMS sine wave) T rigger level for DC coupling Model Numbe r U1251A U1252A U12 ...

  • Agilent Technologies U1251A - page 179

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 159 For current measu rements Peak Hold Specifications T able 7-13 Frequency se nsitivity specif ications fo r current measu rements Input Range Minimum Sensitivity (R.M.S. sine wave) 20 Hz – 20 kHz 500.00 µA 100 µA 5000.0 µA 250 µA 50.000 mA 10 mA 440.00 mA 25 mA 5.0000 A 1 A ...

  • Agilent Technologies U1251A - page 180

    160 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Frequency Counter Specifications for U1252A T able 7-15 Frequency cou nter (div ide by 1) specific ations Range Resolution Accuracy ± (% of reading + No. of Least Significant Digit) Sensitivity Min. Input Frequency 99.999 Hz 0.001 Hz 0.02% + 3 [ 1 ] 100 mV R.M.S. 0.5 Hz 999.99 ...

  • Agilent Technologies U1251A - page 181

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 161 Square W ave Output for U1252A T able 7-17 Square wave output specifications Output [ 1 ] Range Accuracy Frequency 0.5, 1, 2, 5, 1 0, 15, 20, 2 5, 30, 40, 5 0, 60, 75, 80, 100, 120, 150, 20 0, 240, 300, 400, 480, 60 0, 800, 1200 , 1600, 2400, 4800 Hz 0.005% x output freque ncy + ...

  • Agilent Technologies U1251A - page 182

    162 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications Operating Specifications Display update rate (approximate) T able 7-18 Display update ra te (approximate) Function T imes/second AC V 7 AC V + dB 7 DC V (V or mV) 7 AC V (V or mV ) 7 AC+DC V (V or mV) 2 Ω / n S 14 Diode 14 Capacitance 4 (< 100 µF) DC A ( µA, mA, o r A) 7 ...

  • Agilent Technologies U1251A - page 183

    Specifications 8 Agilent U1251A/U 1252A User’s and Service Guide 163 Input impedance T able 7-19 Input Impedanc e Function Range Input Impedance DC V oltage [ 1 ] 50.000 mV 10.00 M Ω 500.00 mV 10.00 M Ω 1000.0 mV 10.00 M Ω 5.0000 V 11.10 M Ω 50.000 V 10.10 M Ω 500.00 V 10.01 M Ω 1000.0 V 10.001 M Ω AC V oltage [ 2 ] 50.000 mV 10.00 M Ω 50 ...

  • Agilent Technologies U1251A - page 184

    164 Agilent U1251A/U1252A Us er’s an d Service Guide 8 Specifications ...

  • Agilent Technologies U1251A - page 185

    © Agilent T e chnologies, Inc. 2006 – 2012 Printed in Malaysia T enth Editi on, May 4, 20 12 U1251-900 03 www .agilent.com Agilent T echnologies Contact us T o obtain service, warranty or technical support assistance, contact us at the following phone numbers: United States: (tel) 800 829 4444 (fax) 800 829 4433 Canada: (tel) 877 894 4414 (fax) ...

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