NI PXIe-4154, Manual

Page: 15 / 32

NI PXIe-4154 Calibration Procedure | © National Instruments Corporation | 15
Complete the following steps to calculate the output resistance for each test point.
1.
Ensure that Remote Sense is ON .
1. Set the electronic load for 100 mA constant current.
2. Record the DMM voltage at the and Output - terminals of Channel 0 of the
NI PXIe-4154
( V
1
).
3. Calculate the current ( I
1
). Divide the voltage measured across the 100 m Ω precision shunt
by the characterized value of the 100 m Ω precision shunt.
4. Increase the electronic load to 1 A constant current.
5. Record the DMM voltage at the and Output - terminals of Channel 0 of the
NI PXIe-4154
( V
2
).
6. Calculate the current ( I
2
). Divide the voltage measured across the 100 m Ω precision shunt
by the characterized value of the 100 m Ω precision shunt.
7. Calculate the output resistance using the following formula:
Output Resistance ( Ω ) = ( V
1
- V
2
) / ( I
2
- I
1
)
Note Output resistance is requested by the NI DCPower Output Resistance
Property Node.