National Instruments PXI-4110 User Manual

NI PXI-4110 Calibration Procedure | © National Instruments | 17
Current Load Regulation
To verify current load regulation, use the NI 4110 in Constant Current mode and confirm that
the output current change falls within calculated limits while varying the load voltage using
different resistors. Table 12 lists the resistance values and measurements needed to complete
verification. Refer to Figure 5 for the necessary connections.
Figure 5. Current Load Regulation Verification Connection Diagram
Complete the following steps to verify current 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 voltage measurement with the NI 4110 (V
1
), use the DMM in series to
measure the output current (I
1
).
3. Change the load from R
1
to R
2
and repeat the previous step.
4. For each test, the units for all current measurements and calculations should be the same as
the I Range unit. Record the current and voltage measurements for both resistances.
5. Calculate the Current Change Limit using the formulas shown in the following tables:
6. Subtract the two current measurements I
1
- I
2
to calculate the Current Change. The test
passes if the Current Change falls within the calculated Current Change Limit.
Table 11. NI 4110 Current Load Regulation Current Change Limit Formulas
Channels Current Range Current Change Limit
0 1A ±2.00 × 10
-4
× (V
1
- V
2
)
1 and 2 20 mA ±6.00 × 10
-7
× (V
1
- V
2
)
1 and 2 1A ±7.00 × 10
-5
× (V
1
- V
2
)
Load
+
–
NI PXI-4110
HI
LO
DMM
Current
Mode
+
–
Auxiliary Power
Supply
NI APS-4100
+
–
AUX IN +
AUX IN –

National Instruments PXI-4110 Specifications

General

Brand	National Instruments
Model	PXI-4110
Category	Power Supply
Language	English