Verifying Current Remote Sense Accuracy
Use the NI 4141 in constant current mode with a test circuit to simulate the voltage drop
between the device and a load.
Measure all of the specified resistors using the DMM before you connect equipment. Record
the values.
Refer to the following table as you complete the following steps.
Table 5. Current Remote Sense Output Verification
Level Range
Limit Range and
Limit
Test Point DMM Range Load
1
Load
2
Base Limit
10 µA
10 V
-10 µA
10 µA
100 kΩ 100 kΩ
3.3 nA
0 µA
10 µA
10 µA
10 µA
100 μA
10 V
-100 μA
100 µA
10 kΩ
10 kΩ
33 nA
0 μA
100 µA
100 μA
100 µA
1 mA
10 V
-1 mA
1 mA
1 kΩ
1 kΩ
330 nA
0 mA
1 mA
1 mA
1 mA
10 mA
10 V
-10 mA
10 mA
100 Ω
100 Ω
3.3 μA
0 mA
10 mA
10 mA
10 mA
100 mA
10 V
-100 mA
100 mA
10 Ω
10 Ω
33 μA
0 mA
100 mA
100 mA
100 mA
1.
Set the first specified level range, limit range, and limit on the NI 4141.
2.
Set the level on the NI 4141 to the first specified test point.
3.
Calculate the total lead drop using the following steps.
a)
Take a current measurement using the DMM. Record the value.
b)
Calculate the voltage across
Load1
using the following formula:
DMM Measured
Current
*
Load1
. Record as
Lead Drop 1
.
c)
Calculate the voltage across
Load2
using the following formula:
DMM Measured
Current
*
Load2
. Record as
Lead Drop 2
.
12
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NI PXIe-4141 Calibration Procedure
