Chapter 5 Calibration
SCXI-1120/D User Manual 5-2 www.natinst.com
6. Connect the amplifier output to the DMM. Make sure that the DMM
can achieve the accuracy and resolution you need.
7. Adjust the output potentiometer of the desired channel until the output
is 0 ± 3 mV.
8. Set the DMM range to the smallest range that can measure ±6 mV.
9. Set the amplifier gain to 1,000.
10. Adjust the input potentiometer of the desired channel until the output
is 0 ± 6 mV.
11. Go to the next channel.
You may seal the potentiometers after calibration with antisabotage lacquer
to avoid tampering with the calibration.
Table 5-1 lists the potentiometer reference designators that correspond to
each channel.
Table 5-1. Calibration Potentiometers Reference Designators
Input
Channel
Number
Amplifier Channel
Input Null Output Null
0 R08 R24
1 R10 R25
2 R12 R26
3 R14 R27
4 R16 R28
5 R18 R29
6 R20 R30
7 R21 R31
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