©
National Instruments Corporation
45
SCC-SG Series Strain-Gauge Modules User Guide
Offset error
............................................. ±
5
µ
V (post calibration)
1
Offset-error temperature coefficient
...... ±
0.6
µ
V/
°
C
2
Offset-nulling adjustment range
............. ±
2.5 mV (RTI)
Nonlinearity ........................................... 10 ppm of full-scale range
Recommended warm-up time ................ 5 minutes
Amplifier Characteristics
Common-mode rejection ratio
(CMRR) ................................................. 110 dB min
Output range
........................................... ±
10 VDC max
Excitation
Number of channels ............................... 1
Level....................................................... +2.5 VDC,
±
0.4%
Current drive .......................................... 42 mA
2
Drift ........................................................ 13 mV/
°
C
Strain-Gauge Bridge Completions
Quarter-bridge ........................................ One 120
Ω
1/4 W, 0.1%
tolerance, 10 ppm/
°
C
or
One 350
Ω
1/4 W, 0.1%
tolerance, 10 ppm/
°
C
Half-bridge ............................................. Two 10 k
Ω
,
±
0.02% ratio
tolerance,
±
2 ppm/
°
C tracking
temperature coefficient of
resistance resistors
Completion Accuracy
Half-bridge completion reference .......... 1.25 VDC,
±
0.4%
1
Excitation current drive assumes two full-bridge 120
Ω
configurations.
2
Temperature range is 0 to 50 °C.
