Manual National Instruments SCC-LP01

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  • National Instruments SCC-LP01 - page 1

    USER GUIDE SCC-LP Series Lowpass Filter Modules The SCC-LP Series lowpass filter mod ules contain fourth-order Butterworth filter circ uitry. They accept two di fferential input signals within a ± 10 V range. A differential ampl ifier attenuates each signal by a factor of two. The output of the amplifier passes through a fourth-order Butterworth f ...

  • National Instruments SCC-LP01 - page 2

    SCC-LP Series Lowpass Filter Module s User Guide 2 ni.com When symbol is marked on a product, it denotes a warning advising you to take precautions to av oid electrical shock. When symbol is marked on a product, it denotes a component that may be hot. T ouching this component may result in bodily injury . bold Bold text denotes items that you must ...

  • National Instruments SCC-LP01 - page 3

    © National Instruments Cor poration 3 SCC-LP Series Lowpass Filter Modul es User Guide What Y ou Need to Get Started To set up and use the SCC-LP XX , you need the following items: ❑ SC-2345/2350 with one o f the following: – SCC-PWR01 – SCC-PWR02 and the PS01 power supply – SCC-PWR03—requires a 7 to 42 VDC power supply (not included) ? ...

  • National Instruments SCC-LP01 - page 4

    SCC-LP Series Lowpass Filter Module s User Guide 4 ni.com Device Specific Information Note For general SCC module installation and signal connection information, and information about the SC-2350 carrier , refer to the SCC Quick Start Guide , av ailable for do wnload at ni.com/manuals . Installing the Module Caution Refer to the Read Me First: Safe ...

  • National Instruments SCC-LP01 - page 5

    © National Instruments Cor poration 5 SCC-LP Series Lowpass Filter Modul es User Guide The signal source can be floating or ground -referenced. The SCC-LP XX input circuitry includ es high-impedance bias resistors t ypically required for floating sources. Therefore, floati ng si gnal sources do not requir e external bias resistors connected to gro ...

  • National Instruments SCC-LP01 - page 6

    SCC-LP Series Lowpass Filter Module s User Guide 6 ni.com Using the SCC-LP XX when Scaling V oltage Measurements If you configur ed the SCC-LP XX u sing Measurement & Automation Explorer (MAX) and you are u sing NI -DAQ , the voltage reading you get from the E Series DAQ device accounts fo r the voltage scaling effect of the SCC-LP XX . O therw ...

  • National Instruments SCC-LP01 - page 7

    © National Instruments Cor poration 7 SCC-LP Series Lowpass Filter Modul es User Guide Input bias current .............. .............. ....... ± 2 nA typ ± 5 nA max 1 Nonlinearity ... ................. ................ ....... 0.004% of full scale Filter Characteristics Filter type ......... ................. ......... ........ .... Fourth-orde ...

  • National Instruments SCC-LP01 - page 8

    SCC-LP Series Lowpass Filter Module s User Guide 8 ni.com Stability Gain temperature coefficient .............. ....10 ppm/°C typ 20 ppm/°C m ax Offset-voltage temperature coefficient . ... .............. .........3.4 µ V/°C typ (RTI) 27 µ V/°C max Power Requirement Analog power SCC-LP01, SCC-LP02 ........... .........135 mW max +15 V ....... ...

  • National Instruments SCC-LP01 - page 9

    © National Instruments Cor poration 9 SCC-LP Series Lowpass Filter Modul es User Guide Humidity ............. ................. .............. .... 10 to 90% RH, noncondensing Maximum altitude ................... ............... 2,000 m Pollution Degree (indoor use only) ........ 2 Safety The SCC-LP XX meets the requirements of the follo wing stan ...

  • National Instruments SCC-LP01 - page 10

    SCC-LP Series Lowpass Filter Module s User Guide 10 ni.com Theor y of Operation SCC-LP XX Performance The SCC-LP XX uses a Butterworth filter, which is characterized by maximal flatness in the passband with very sharp monotonic rol loff. It has a nonlinear phase response, the delay is not constant, and the st ep response exhibits a moderate amount ...

  • National Instruments SCC-LP01 - page 11

    © National Instruments Corpor ation 11 SCC-LP Series Lowpass Filter Modul es User Guide Figure 3. T ypical SCC-LP02 Response Curve Figure 4. T ypical SCC-LP03 Response Curve F requency (Hz) Amplitude (dB) – 25.0 1 2 3 4 5 10 20 25 50 100 – 20.0 – 15.0 – 10.0 – 5.0 0.0 F requency (Hz) Amplitude (dB) – 25.0 1 2 3 4 5 10 20 25 50 300 – ...

  • National Instruments SCC-LP01 - page 12

    SCC-LP Series Lowpass Filter Module s User Guide 12 ni.com Figure 5. T ypical SCC-LP04 Response Curve 1 2 3 4 5 10 20 50 1000 2000 –25.0 –20.0 –15.0 –10.0 –5.0 0.0 2.5 F requency (Hz) Amplitude (dB) ...

  • National Instruments SCC-LP01 - page 13

    © National Instruments Corpor ation 13 SCC-LP Series Lowpass Filter Modul es User Guide Figure 6 shows the theoretical transf er characteristics of the SCC-LP XX . Figure 6. Theoretical T r ansfer Characte ristics a. Frequency Response 0 0.1 0.15 0.5 Normalized F requency (f/fc) Amplitude (dB) 1 1.5 5 10 –20 –40 –60 –80 –100 b . Group De ...

  • National Instruments SCC-LP01 - page 14

    SCC-LP Series Lowpass Filter Module s User Guide 14 ni.com The horizontal axes of the first tw o plots are normali zed to the SCC-LP XX cutof f frequency . W hen the input freq uency (f ) equals the cuto ff fr equenc y (fc), the normalized frequency has a v alue of 1. The vertical axis of the third plot is normalized to the magnitude of the step in ...

  • National Instruments SCC-LP01 - page 15

    © National Instruments Corpor ation 15 SCC-LP Series Lowpass Filter Modul es User Guide Using the SCC-LP XX as an Antialiasing Filter Aliasing, a phenomenon of voltage-sampling systems, causes a high-fre quency signal to take on th e identity of a low-frequency signal. Figure 7. Aliasing of an Input Signal Freque ncy of 0.8 T imes the Sampling Rat ...

  • National Instruments SCC-LP01 - page 16

    SCC-LP Series Lowpass Filter Module s User Guide 16 ni.com Calibrating Gain Errors The SCC-LP XX is calibrated at the facto ry before shipment. If you want to calibrate the SCC-LP XX in your system, you need a vol tage source capable of providing a D C voltage up to ± 10 V that is several times more accu rate than the SCC itself. T o calibra te th ...

  • National Instruments SCC-LP01 - page 17

    © National Instruments Corpor ation 17 SCC-LP Series Lowpass Filter Modul es User Guide SCC-LP XX Module Pin Assignments Figure 8 shows the I/O connector pin s on the bottom of the modul e. Figure 8. SCC Module Bottom View 1P i n 1 2P i n 2 3P W B K e y 4 Pin 19 5P i n 2 0 5 4 2 1 3 ...

  • National Instruments SCC-LP01 - page 18

    National Instruments™, NI™, ni.com ™, and NI-D AQ™ are trademarks of National Inst ruments Corporation. Product and com pany names mentioned herein are trademarks or trade names of their respective companies. Fo r patents covering National Instruments products, refer to the appropriate location: Help»Patents in you r software, th e patents ...

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All of them are important, but the most important information from the point of view of use of the device are in the user manual National Instruments SCC-LP01.

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A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use National Instruments SCC-LP01 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of National Instruments SCC-LP01.

A complete National Instruments manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual National Instruments SCC-LP01 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the National Instruments SCC-LP01, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the National Instruments SCC-LP01, that we can find in the current document
3. Tips how to use the basic functions of the device National Instruments SCC-LP01 - which should help us in our first steps of using National Instruments SCC-LP01
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5. FAQ - Frequently Asked Questions
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