C Measurement Uncertainty Analysis - Power Reference Level Test; Measurement Introduction; Define The Measurand; Define The Measurement Equation - Agilent Technologies E4416A Service Manual

C Measurement Uncertainty Analysis - Power Reference Level Test

Measurement Introduction

In the Power Reference Level Test, the output from the DUT's 1mW Power Ref
connector is measured.
A Agilent 432A Power Meter and an 8478B H01 Power Sensor are required for
this test. Also the H01 power sensor's calibration factor uncertainty at 50 MHz
must be no greater than ±0.2%.
A Agilent 3458A DMM is required to read the V
Agilent 432A. This is preferred to estimating an inaccurate visual reading from
the Agilent 432A front panel.

Define the Measurand

The measurand is the output power of the 1mW reference in the DUT.

Define the Measurement Equation

P
meas
where,
V is the voltage measured between V
0
example, the reference switched off and after the Agilent 432A has been
zeroed.
V is the voltage measured between V
1
example, the reference switched on.
V
comp
ground with power applied.
R is mount resistance of the 432A meter.
C-136
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⋅ ⋅ ( )
2 V V – V
comp 1 0
= -------------------------------------------------------------------------------- -
⋅ ⋅ ⋅
4 R CF
is the voltage between the 432A V
and V
ref comp
2 2
+ V – V
0 1
M
s
and V with no power applied, for
comp ref
and V with power applied, for
comp ref
rear connector and chassis
comp
E4416A/E4417A Power Meters Service Guide
outputs of the