12
|
ni.com
|
NI PXI-4110 Calibration Procedure
Verifying Current Measurement Accuracy
Note
Program the NI 4110 in DC Voltage mode for this test.
Note
Set the Current Limit and the Current Limit Range to the values in the
Current Range
column of Table 8.
To verify current measurement accuracy, compare a set of voltage setpoints as measured by an
external DMM to the measured voltage reported by the NI 4110. Connect an NI APS-4100
auxiliary power supply for this verification procedure. Refer to the following figure for the
necessary connections.
Figure 3.
Current Measurement Connection Diagram
2
-16
20 mA
1
*
25,000
0.000400
±0.000060
2
2,000
0.005000
±0.000068
3
1,000
0.010000
±0.000075
4
670
0.015000
±0.000083
5
500
0.020000
±0.000090
*
Wait 15 s for the output of the NI 4110 to settle.
Table 7.
NI 4110 Output Parameters and Test Limits for Current
Programming Accuracy Verification (Continued)
Channel(s)
Output
(V)
Current
Range
Iteration
Equivalent
Resistance
(
Ω
)
Output
(A)
Test Limit
(A)
Lo
a
d
+
–
NI PXI-4110
HI
LO
DMM
C
u
rrent
Mode
+
–
A
u
xili
a
ry Power
Su
pply
NI AP
S
-4100
+
–
AUX IN +
AUX IN –
