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Table of contents for the manual
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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[...]
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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 [...]
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© 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) ?[...]
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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[...]
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© 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[...]
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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[...]
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© 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[...]
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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 .......[...]
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© 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[...]
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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 [...]
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© 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 – [...]
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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)[...]
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© 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[...]
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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[...]
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© 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[...]
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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[...]
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© 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[...]
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