HP 436A - Page 55

Operation
Model
436A
3-34
POWER
SENSOR MISMATCH VERSUS
MEASUREMENT
ACCURACY
(50 OHM SYSTEM)
Instrument Calibration
Indicated
and Measurement
Power Resolution
Uncertainty
Uncertainty
Total
Uncertainty
I
+3.63
dBm
I
I
2.31
mW
POWER
SENSOR
NO.
1
I
SWR
1
=1.5
+0.56
dB
POWER
SOURCE
SWR
5
=
2.0
+13.8%
I
I
I
+3.0
dBm
+0.07
dB;
+1.7%
ACTUAL
LEVEL
OF
POWER
-0.07
dB;
-1.7%
I
SOURCE
MAY
BE
ANYWHERE
2.00
mW
IN
THIS
BAND
I
-0.60
dB
I
I
-13.0%
I
I
I
+2.33
dBm
I
I
1.71
mW
I
I
I
I
+3.38
dBm
POWER
SENSOR
NO.
2
SWR
2
=
1.25
I
2.18
mW
POWER
SOURCE
+0.31
dB
SWR
5
=
2.0
+7.3%
I
I
+3.0
dBm
+0.07
dB;
+1.7%
I
ACTUAL
LEVEL
OF
POWER
SOURCE
MAY
BE
ANYWHERE
2.00mW
-0.07
dB;
-1.7%
I
IN
THIS
BAND
-0.32
dB
-7.2%
I
I
+2.62
dBm
1.82
mW
Figure
3-10.
The
Effect
of
Power
Sensor
Mismatch
on
Measurement
Accuracy
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