NI PXI-4130 Calibration Procedure
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© National Instruments
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25
Verifying Line Regulation
Complete the line regulation test to verify that the output voltage falls within specified limits
when the line voltage coming from the auxiliary power supply changes or that the output current
falls within specified limits when the line voltage changes. Each test requires a variable auxiliary
power to vary the line voltage or current. An NI APS-4100 is not sufficient for verifying line
regulation because the output voltage is fixed.
Note
Run this test only after the verifying the voltage measurement accuracy and
current measurement accuracy tests have passed.
Refer to the
Verifying Voltage Measurement Accuracy
section and the
section for instructions about running these measurement accuracy
tests.
Voltage Line Regulation
To verify voltage line regulation, use the NI PXI-4130 in constant voltage mode and confirm
that the output voltage change falls within calculated limits while varying the line voltage using
a variable power supply. Table 14 lists the voltage values and measurements needed to complete
verification. Refer to Figure 8 for the necessary connections.
Figure 8.
Voltage Line Regulation Verification Connection Diagram
Complete the following steps to verify voltage load regulation:
1.
For each test, adjust the external variable power supply to the specified voltage (
V
ext
) listed
in Table 14.
2.
Set the NI 4130 to output the voltage specified in Table 14.
3.
Use the DMM to measure the voltage across the output of the specified channel of the
NI 4130 (
V
1
).
4.
Change the external variable power supply voltage from
V
ext1
to
V
ext2
and repeat the
previous step.
NI 41
3
0
+
–
LO
S
en
s
e
HI
S
en
s
e
HI
LO
DMM
Volt
a
ge
Mode
V
a
ri
ab
le Power
Su
pply
+
–
AUX IN
+
AUX IN
–