NI PXI-4110 Calibration Procedure
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© National Instruments
|
15
Voltage Load Regulation
To verify voltage load regulation, use the NI 4110 in constant voltage mode and confirm that the
output voltage change falls within calculated limits while varying the load current using different
resistors. Table 10 lists the resistance values and measurements needed to complete verification.
Refer to Figure 4 for the necessary connections.
Figure 4.
Voltage Load Regulation Verification Connection Diagram
Complete the following steps to verify voltage load regulation:
1.
For each test, connect the first specified resistance (
R
1
) to the specified channel of the
NI 4110.
2.
While taking a current measurement with the NI 4110 (
I
1
), use the DMM to measure the
voltage across the output of the NI 4110 (
V
1
).
3.
Change the load from
R
1
to
R
2
and repeat the previous step.
4.
Record the voltage and current measurements for both resistances.
5.
Calculate the
Voltage Change Limit
using the formulas in the following table, where the
current is in mA.
6.
Subtract the two voltage measurements
V
1
-
V
2
to calculate the
Voltage Change
. The test
passes if the
Voltage Change
falls within the calculated
Voltage Change Limit
.
Table 9.
NI 4110 Voltage Load Regulation Voltage Change Limit Formulas
Channels
Voltage Change Limit
0
± (
I
1
-
I
2
) × 2.52 × 10
-5
1 and 2
± (
I
1
-
I
2
) × 2.00 × 10
-5
NI PXI-4110
Lo
a
d
+
–
+
–
HI
LO
DMM
Volt
a
ge
Mode
A
u
xili
a
ry Power
Su
pply
+
–
AUX IN +
AUX IN –
NI AP
S
-4100
