Agilent Technologies e4418b, e4419b manual Uncertainty Equation, u2MA = CTSE ⋅ uTSE 2 + CMV ⋅ u MV

Measurement Uncertainty Analysis – Instrument Accuracy Test

Measurement Introduction

Hence: Measurement Accuracy = f(MV , TSE)

The Measurement Uncertainty is not calculated from different sensor and power meter combinations, rather it is taken care of in the Customer Limit specification setting. Hence using the same power meter and making measurements a number of times will give us the uncertainty of the test station, without the uncertainty associated with the meter itself. By taking n samples of the same meter/DUT in effect we are averaging out the error associated with the DUT’s measurement capability leaving us with a raw test station uncertainty which is made up from TSE and the DMM error, for example, the Measured Voltage (MV).

The method that is used to calculate the Measurement Uncertainty of our test station is a combination of Type A and Type B analysis in line with the ISO Expression of Measurement Uncertainty Guide.

Uncertainty Equation

u2(MA ) = [CTSE ⋅ u(TSE )]2 + [CMV ⋅ u( MV) ]2

TSE

The Measurement Uncertainty of the Measurement Accuracy is calculated from testing the same DUT at 5dB step power level from –25dBm to +20dBm.

A-4 Agilent E4416A/E4417A Service Guide