NI PXI-4130 Calibration Procedure
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© National Instruments
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19
Figure 5.
Accuracy Derating versus Load Current
Verifying Load Regulation
Complete the load regulation test to verify that the output voltage falls within specified limits
when the load current changes, or that the output current falls within specified limits when the
load voltage changes. Each test requires an external load to vary the load voltage or current. Load
Regulation Verification results are dependent upon voltage and current measurement accuracy.
Any failure of the Voltage Measurement Verification or Current Measurement Verification
steps may result in a failure of the Load Regulation Verification steps.
Connect the NI APS-4100 to the Aux Power Input connections for load regulation tests.
1
2 A
20 V
0
1
0.5 A
0.12% + 200
μ
A
1
20
2
0.5 A
3
1.0 A
4
1.5 A
5
2.0 A
-20 V
6
0.5 A
7
1.0 A
8
1.5 A
9
2.0 A
1
For currents
≥
500 mA, refer to the additional derating information in Figure 5,
Accuracy Derating versus Load Current
Table 8.
NI 4130 Output Parameters and Test Limits for Current Measurement
Accuracy Verification (Continued)
Channel(s)
Current
Limit
Range
Voltage
Level
Range
(V)
Voltage
Level
(V)
Iteration
Output
Test Limit ±
(% of r
offset)
0
0
0.5
1.0
1.5
2.0
O
u
tp
u
t C
u
rrent (A)
Addition
a
l Error (%)
0.25
0.2
0.15
0.1
0.05
Ch
a
nnel 0
Ch
a
nnel 1