NI PXIe-4154, Manual

Page: 14 / 32

14 | ni.com | NI PXIe-4154 Calibration Procedure
Output Resistance Verification (Channel 0 Only)
To verify the output resistance of an NI PXIe-4154, compare a range of requested resistance test
points to measurements of the actual resistance at output. Calculate using two external DMMs
and a 100 m
Ω precision shunt. Refer to Figure 7 for a connection diagram.
Figure 7.
Output Resistance and Load Regulation Verification
Connection Diagram with 100 m Ω Precision Shunt
Note
Use twisted-pair cables for connections from and Output - to the
electronic load. Refer to Figure 1 for a connection diagram. Use short wires to jumper
Sense + to , and Sense - to Output -.
Refer to Table 6 for a list of output resistance test points that you must request and measure with
two external DMMs to complete verification. For example, program the verification application
to separately request -0.04
Ω , 0 Ω , 0.25 Ω , 0.5 Ω , 0.75 Ω , and 1 Ω outputs from the
NI PXIe-4154. Configure the NI PXIe-4154 to output 4 V with a current limit of 3 A.
Note
After requesting a new output resistance, wait one second to take a
measurement with the external DMMs to ensure the system has adequate time to
settle.
NI PXIe-4154
Sense –
Sense +
Output –
DMM
Voltage
Mode
+
–
DMM
Voltage
Mode
+
–
Precision
100 m
Ω
Shunt
I
2
S
2
I
1
S
1
Electronic
Load
+
–