Measuremet Uncertainty Analysis - Instrument Accuracy Test D
Keysight E4416A/E4417A Power Meters Service Guide 165
The distributions are all normal.
3458A DMM Uncertainty:
The uncertainty of the voltage measured by the 3458A is:
Error = (ppm of reading + ppm of range) + (factory traceability) + (temperature
coefficient)
Conditions: 1 Year Calibration and temperature variance +/
−5 °C with ACAL on
dc volts.
Reference: 3458A Operating Manual Appendix A
Factory Traceability: From 6 ppm to 0.5 ppm Standard Uncertainty depending on
range.
Table D-1 Standard Uncertainty Results
Power Level Standard Deviation of 30 Readings Conversion to Linear Units
Standard Uncertainty
u(X(−25)) 3.162 μW
0.0132 dB
0.0097
μW
u(
X(−20)) 10 μW
0.0038 dB
0.009
μW
u(
X(−15)) 31.62 μW
0.0013 dB
0.0095
μW
u(X(−10)) 100 μW
0.0015 dB
0.035
μW
u(X(−5)) 316.2 μW
0.0004 dB
0.03
μW
u(X(0)) 1 mW 0.0003 dB 0.00007 mW
u(X(5)) 3.16227 mW 0.0003 dB 0.00022 mW
u(X(10)) 10 mW 0.0003 dB 0.000690 mW
u(X(15) 31.62277 mW 0.0003 dB 0.0022 mW
u(X(20)) 100 mW 0.0004 dB 0.0092 mW
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