2 Performance Tests
62 Keysight E4416A/E4417A Power Meters Service Guide
This cannot be directly solved for because it is a complex quantity. In order to
solve for additional values of load reflection coefficient are required with a
phase difference of approximately 120
o
. However an approximate solution using
two values of can give adequately accurate results provided the phase angle
of the source is within ±40
o
of 0
o
or ±180
o
.
Equipment
– Test power meter: Keysight 432A.
– Thermistor mount: Keysight 478A Option H75 or H76.
– Digital voltmeter (DVM): Keysight 3458A.
Test Setup
Procedure
Use the following procedure to perform the test:
Figure 2-10 Output Standing Wave Ratio Test Setup
Power Meter
Test Power Meter
V
RF
V
comp
Thermistor
mount
Power ref
Digital Voltmeter
+ input
− input
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