Instruction/ maintenance manual of the product SCC-LP03 National Instruments
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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.
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.
© 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 w.
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.
© 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.
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 .
© 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 .
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 .
© 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) .
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.
© 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.
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.
© 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.
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.
© 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.
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.
© 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.
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An important point after buying a device National Instruments SCC-LP03 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought National Instruments SCC-LP03 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data National Instruments SCC-LP03 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, National Instruments SCC-LP03 you will learn all the available features of the product, as well as information on its operation. The information that you get National Instruments SCC-LP03 will certainly help you make a decision on the purchase.
If you already are a holder of National Instruments SCC-LP03, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime National Instruments SCC-LP03.
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