NI PXI-4130 Calibration Procedure | © National Instruments | 35
Adjusting Voltage Measurement Accuracy
To adjust voltage measurement, compare a set of voltage output points as measured by an
external DMM to the measured voltage reported by the NI 4130. Configure the voltage level
using the Output value for the iteration of channel x in Table 19. Refer to the figure below for
the necessary connections.
To ensure the system has had adequate time to settle, wait one second after requesting a new
voltage before taking a measurement with the DMM. Set the Samples to Average property
to
300.
Use the niDCPower Cal Adjust Voltage Measurement VI (niDCPower_
CalAdjustVoltageMeasurement
function) to calculate the new calibration coefficients.
Pass the voltage values reported by the NI 410 to the Reported Outputs input of the VI, and pass
the voltage values measured by the DMM to the Measured Outputs input of the VI. Call this VI
or function once per range.
Figure 13. Voltage Adjustment Connection Diagram
Table 19. NI 4130 Output Parameters for Voltage Measurement Accuracy Adjustment
Channel Iteration
Voltage Level
Range (V)
Output (V)
Current Limit
(A)
0 1 6 0 0.5
2 3
3 6
1 1 20 -20
2 0
3 20
NI 4130
+
–
LO Sense
HI Sense
HI
LO
DMM
Voltage
Mode
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