National Instruments NI PXIe-4139, Процедура калибровки

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6. Compare a DMM current measurement to the current measurement test limits.
a)
Take a current measurement using the DMM.
b) Calculate the lower and upper current measurement test limits using the following
formula:
Current Measurement Test Limits = Test Point ± (| Test Point | * % of Current +
Offset )
c) Verify the DMM measurement falls within the test limits.
7. If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the PXIe-4139 up to this step.
8. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Verifying 1 A and 3 A Current Measurement and
Output
Compare a set of currents measured by a DMM to the current test points requested by the
PXIe-4139.
Refer to the following table as you complete the following steps.
Complete this procedure only after successfully completing all previous verification
procedures. Verify ranges in the order listed in the table.
Table 9. 1 A and 3 A Current Output and Measurement Verification
Level
Range
Limit
Range
and Limit
Shunt Test
Point
As-Found
Measurement Test
Limit (% of Current
+ Offset)
As-Left
Measurement Test
Limit (% of Current
+ Offset)
1 A 6 V 1 Ω -1 A 0.027% + 20 μA 0.013% + 15 μA
1 A
3 A 6 V 333 mΩ -3 A 0.083% + 600 μA 0.045% + 500 μA
3 A
1. Make the necessary connections for this procedure, as shown in the following figure:
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