National Instruments NI PXIe-4139 Calibration Procedure

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National Instruments NI PXIe-4139 Calibration Procedure Manual pdf 16 page image

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 followingformula: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 eachtest 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 valuesspecified in each level range.Verifying 1 A and 3 A Current Measurement andOutputCompare a set of currents measured by a DMM to the current test points requested by thePXIe-4139.Refer to the following table as you complete the following steps.Complete this procedure only after successfully completing all previous verificationprocedures. Verify ranges in the order listed in the table.Table 9. 1 A and 3 A Current Output and Measurement VerificationLevelRangeLimitRangeand LimitShunt TestPointAs-FoundMeasurement TestLimit (% of Current+ Offset)As-LeftMeasurement TestLimit (% of Current+ Offset)1 A 6 V 1 Ω -1 A 0.027% + 20 μA 0.013% + 15 μA1 A3 A 6 V 333 mΩ -3 A 0.083% + 600 μA 0.045% + 500 μA3 A1. Make the necessary connections for this procedure, as shown in the following figure:16 | ni.com | NI PXIe-4139 Calibration Procedure