Measurement Uncertainty Analysis – Instrument Accuracy Test
Measurement Introduction
By using the DMM Uncertainties calculated previously the worst case voltage and corresponding power errors can be calculated.
Power Setting |
| DMM Error on | Worst Case | Worst Case | |
Applied Volts | Range Standard | Voltage Error on | Power Error on | ||
(mW) | |||||
| Uncertainty (uV) | Range (%) | Range | ||
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0.001 | 0.14493mV | <1.371uV | 0.946% | 0.00946uW | |
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0.01 | 1.4493mV | <1.371uV | 0.0946% | 0.00946uW | |
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0.1 | 14.493mV | 1.371uV | 0.00946% | 0.00946uW | |
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1 | 144.93mV | 6.09uV | 0.00420% | 0.042uW | |
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10 | 1.4588V | 56.8uV | 0.00389% | 0.389uW | |
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100 | 15.6V | 148.8uV | 0.00095% | 0.95uW | |
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Sensitivity Coefficients Ci:
The partial derivatives of the measurement equation Y = f(MV, TSE) equal 1.
TSE is derived from a number of readings taken by the test station to characterize the cabling, connectors noise and so forth. Therefore no measurement equation exists to differentiate. It is a measured value of magnitude.
Hence:
d
CTSE = dTSETSE = 1
The DMM Measured Voltage also has a sensitivity coefficient equal to 1. As with the TSE the Measured Voltage is not computed from an equation. Is it a real value that the DMM actually measures.
Hence:
d
CMV = dMVMV = 1
Agilent E4416A/E4417A Service Guide |
