NI SCC-SG03

NI SCC-SG03 is an SCC Series strain-gage input module for half-bridge measurements in the NI SCC platform. NI distinguishes this model from other SCC-SG variants: SCC-SG01 is quarter-bridge 120 Ω, SCC-SG02 is quarter-bridge 350 Ω, SCC-SG03 is half-bridge, SCC-SG04 is full-bridge, and SCC-SG24 is full-bridge for at least 350 Ω. The official NI configuration worksheet and EOL listing identify SCC-SG03 with part number 777459-15 as a 2-channel half-bridge module.

The module provides two differential strain-gage channels with a ±100 mV input range and fixed gain of 100 on each channel. NI specifies 1.6 kHz bandwidth with a single-pole RC filter, 1 µVrms input noise, gain error of ±0.8% of reading maximum, and post-calibration offset error of ±5 µV. Additional published performance values include 110 dB minimum CMRR, ±2.5 mV RTI offset-nulling adjustment range, and a maximum output range of ±10 VDC.

For bridge excitation and completion, NI specifies one excitation source at +2.5 VDC ±0.4% with 42 mA current drive. The SCC-SG03 half-bridge completion network uses two 10 kΩ resistors with ±0.02% ratio tolerance and ±2 ppm/°C tracking TCR, and NI lists the half-bridge completion reference accuracy as 1.25 VDC ±0.4%. The user guide documents Half-Bridge Type I and Half-Bridge Type II wiring, and also notes a quarter-bridge type II arrangement that uses SCC-SG03 half-bridge completion.