Portable, Modular Signal Conditioning Modules
NI SCC-FV01 Frequency Input Module
NI SCC-CI20 Current Input
Model
Channel
Description
Part Number
Model
Channel
Description
Part Number
SCC-FV01
2
Frequency-to-voltage conversion (0 to 100 Hz)
777459-32
SCC-CI20
2
0 to 20 mA current input
777459-05
The National Instruments SCC-FV01 is a dual-channel frequency-to-
voltage conversion module that accepts ±10 V signals up to 100 Hz. The
output scales linearly with the input frequency, and goes to 0 V with a
DC input signal. Each channel triggers on the incoming signal using a
threshold of 0 V and a hysteresis of 200 mV. For isolated solutions,
consider using the SCC-AI03 cascaded with the NI SCC-FV01.
The National Instruments SCC-CI20 is a dual-channel module that
accepts two 0 to 20 mA or 4 to 20 mA current loop inputs. Each
independent channel of the NI SCC-CI20 includes a precision 249 Ω
current conversion resistor that converts a 0 to 20 mA signal into a
0 to 5 V signal. Each channel includes a differential instrumentation
amplifier with low-impedance outputs for maximum scanning rates by
the multifunction DAQ device, and bias resistors for handling both
floating and ground-referenced current sources. The SCC-CI20 also
includes two spare 249 Ω resistors.
Specifications
SCC-FV01
When you install the SCC-CI20 in the SC-2345, the carrier routes the
two output voltages to two input channels of the DAQ device, channels x
and x+8, where x is 0 through 7. For example, if you install the module in
the J1 socket of the SC-2345, the output voltages are routed to input
channels 0 and 8 of the DAQ device.
Input Characteristics
Number of input channels .................. 2 referenced single ended
Input range.......................................... 200 mV1 to 10 V
Input coupling ..................................... DC
Minimum input frequency................... 0 Hz
Minimum input pulse width
(5 V pulse train) .............................. 1.5 µs
Overvoltage protection ....................... ±40 VAC + DC (powered on
or off)
Specifications
SCC-CI20
Input impedance
Input Characteristics
Signal > threshold .......................... 400 kΩ
Signal < threshold .......................... 10 MΩ
Threshold............................................. Zero crossing
Hysteresis............................................ 200 mV
Number of channels............................ 2 differential
Input range.......................................... 0 to 20 mA
Output range ....................................... 0 to 5 V
Gain error ............................................ ±0.1ꢀ of reading maximum
Offset error.......................................... ±0.± mV maximum
Input resistor....................................... 249 Ω, 0.05ꢀ, 0.25 W
Full power bandwidth......................... 10 kHz
Transfer Characteristics
Rise/fall time ...................................... 80 ms (0 to +±3ꢀ)
Step response ..................................... 220 ms at 90ꢀ; 3±0 ms at 99ꢀ
Output offset....................................... 5 mV max
Output offset temperature
coefficient....................................... 10 ppm/°C
Gain error temperature coefficient..... 100 ppm/°C
Nonlinearity......................................... 0.015ꢀ full scale
Output ripple ....................................... 30 mVpp at 10 Hz
Output range ....................................... 0 to +10 V
Recommended warm-up time............. 5 minutes
Power Requirements
Analog................................................. 100 mW
Power Requirements
Analog................................................. 100 mW
1Recommended; minimum 100 mV.
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NI [ National Instruments ]
