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DC Compliance
Current Measurements
DC Short Circuit
Current Measurements
Current Output
Measurements
Test Accuracy
Ratio (TAR)
44 Verification Tests
The 100 V range is used for the compliance current test. (The compliance
current is inferred from the voltage developed across the resistor).
M.U. = (0.035% of reading + 0.0006% of range)
M.U. = (0.00042 + 0.0006) = 0.00102 V
The 100 mA range is used for the short circuit current measurement.
M.U. = (0.030% of reading + 0.005% of range)
M.U. = (0.000018 + 0.000005) = 0.000023 A
The 100 mA range is used for the current output measurements.
M.U. = (0.030% of reading + 0.005% of range)
HP E1418A
% of reading
Output
+ 0.020 A
0.000006 A
+ 0.015 A
0.0000045 A
+ 0.010 A
0.000003 A
+ 0.005 A
0.0000015 A
0.000 A
0.00000 A
– 0.005 A
0.0000015 A
– 0.010 A
0.000003 A
– 0.015 A
0.0000045 A
– 0.020 A
0.000006 A
The Test Accuracy Ratio (TAR) is defined as:
Maximum Allowed Input
TAR
Measurement Uncertainty
Where Maximum Allowed, Input, and Measurement Uncertainty are all in
Vdc or Amps.
The TAR is listed in table 4-1.
% of range
Measurement
Uncertainty
0.000005 A
0.000011 A
0.000005 A
0.0000095 A
0.000005 A
0.000008 A
0.000005 A
0.0000065 A
0.000005 A
0.000005 A
0.000005 A
0.0000065 A
0.000005 A
0.000008 A
0.000005 A
0.0000095 A
0.000005 A
0.000011 A
Chapter 4
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