Performance Tests
Output Standing Wave Ratio (SWR) Test
Agilent E4418B/E4419B Service Guide 2-25
Equipment
• Test power meter: Agilent 432A.
• Thermistor mount: Agilent 478A option H75 or H76.
• Digital voltmeter (DVM): Agilent 3458A.
Test Setup
Figure 2-7: Output Standing Wave Ratio Test Setup
Procedure
Use the following procedure to perform the test:
Note Steps 1 to 7 of this procedure require pre-requisite knowledge of some
Agilent 432A and 478A parameters. Refer to Appendix A for further
information.
1. Record the input VRC magnitude of the thermistor mount at 50 MHz
with the Agilent 432A power meter set to 200Ω:
•|R
1
| ___________
2. Record the input VRC magnitude of the thermistor mount at 50 MHz
with the Agilent 432A power meter set to 100Ω:
•|R
2
| ___________
3. Set the Agilent 432A mount resistance switch to 200Ω.
4. Set the DVM to measure resistance:
Connect the DVM between the VRF connector on the rear panel of the
Agilent 432A and pin 1 on the thermistor mount end of the sensor
cable. Verify that no power is applied to the Agilent 432A.
Power Meter
V
RF
V
comp
Thermistor
mount
Digital Voltmeter
Power
ref
+ input
Test Power Meter
- input
4402serv.book Page 25 Tuesday, October 14, 2003 3:18 PM
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