C Measurement Uncertainty Analysis - Power Reference Level Test
148 Keysight E4416A/E4417A Power Meters Service Guide
Measurement Introduction
In the Power Reference Level Test, the output from the DUT's 1mW Power Ref
connector is measured.
A Keysight 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 Keysight 3458A DMM is required to read the V
ref
and V
comp
outputs of the
Keysight 432A. This is preferred to estimating an inaccurate visual reading from
the Keysight 432A front panel.
Define the Measurand
The measurand is the output power of the 1mW reference in the DUT.
Define the Measurement Equation
where,
V
0
is the voltage measured between V
comp
and V
ref
with no power applied, for
example, the reference switched off and after the Keysight 432A has been zeroed.
V
1
is the voltage measured between V
comp
and V
ref
with power applied, for
example, the reference switched on.
V
comp
is the voltage between the 432A V
comp
rear connector and chassis ground
with power applied.
R is mount resistance of the 432A meter.
P
meas
2 V
comp
V
1
V
0
–()⋅ V
0
2
V
1
2
–+⋅
4 RCFM
s
⋅⋅ ⋅
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