Agilent Technologies e4419b, e4418b manual Calibration factor, Sensor Calibration Factor Drift

Measurement Uncertainty Analysis – Power Reference Level Test

Measurement Introduction

So u(Ms) from the equation above equals:

( ) ±(0.0244 ) ⋅ (0.0244)

u Ms = ---------------------------------------------------- = 0.00042

2

Mismatch Uncertainty U(Ms) worst case

UMs = 2PsPd = 2 2 ⋅ u( Ms) = 0.0012

Calibration factor

The calibration factors supplied with the power sensor take into account the performance of the sensor with respect to frequency. This value is of secondary importance when calculating the overall uncertainty of the 1mW reference.

The information that is appropriate is the Uncertainty of the Calibration Factor. The power sensor must be calibrated such that:

Uncertainty of Calibration Factor < 0.2%

Therefore,

U(CF) = 0.002

Sensor Calibration Factor Drift

The Agilent Standards Laboratory at South Queensferry has determined the following average sensor drift value.

Average Sensor Drift < 0.06% per year

Therefore

U(Drift) = 0.0006

Note This value is only valid for 8478B sensors calibrated to 0.2% accuracy.

Agilent E4416A/E4417A Service Guide B-7