2Performance Tests
52 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: Agilent 432A.
• Thermistor mount: Agilent 478A Option H75 or H76.
• Digital voltmeter (DVM): Agilent 3458A.
Test S et up
Procedure
Use the following procedure to perform the test:
Figure 2-10 Output Standing Wave Ratio Test Setup
Power Meter
Tes t Powe r Mete r
V
RF
V
comp
Thermistor
mount
Power ref
Digital Voltmeter
+ input
− input
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