National Instruments SCXI-1102B Voltage Input Module

The SCXI-1102B (Part Number: 776572-02B) has a three-pole lowpass filter with a 200 Hz cutoff frequency, 32 differential channels, and DC input coupling. This module also has a cold-junction compensation sensor for temperature measurements. The inputs on this module can be multiplexed to one output, which in turn drives one DAQ device channel.

The SCXI 1102B has a differential input signal range of ±10 V when utilizing a gain of 1 or ±0.1 V when utilizing a gain of 100. The differential input range is the greatest measurable voltage variance between the positive and negative channel inputs. The common-mode input signal range of the NI SCXI-1102B Voltage Input Module is ±10 V. The common-mode input range for positive or negative channel input is the greatest input voltage that leads to an accurate measurement. Every channel on the SCXI-1102B module comes with input protection circuitry to endure the unintentional application of voltages to ±42 VAC peak or 60 VDC maximum. The user should keep in mind that going above the differential or common-mode input channel ranges will lead to an inaccurate signal measurement. It can also result in an increased settling time prerequisite of the linked E/M Series DAQ instrument.

The input signals on the NI SCXI-1102B Voltage Input Module can be ground-referenced or floating. Prior to linking the thermocouple or another signal, the user must confirm if it is ground-referenced or floating. Floating signals must be ground-referenced by linking the negative channel input to chassis ground via a bias resistor. The second option is to utilize the bias resistors included with certain terminal blocks, such as the SCXI-1303.

SCXI-1102B Obsolete Status has been announced by National Instruments, but the module will still be available for purchase and repairs by Apex Waves.