Equipment; Test Setup; Procedure - Agilent Technologies E4418B Service Manual

Equipment

• Test power meter: Agilent 432A.
• Thermistor mount: Agilent 478A option H75 or H76.
• Digital voltmeter (DVM): Agilent 3458A.

Test Setup

Power Meter

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
2. Record the input VRC magnitude of the thermistor mount at 50 MHz
3. Set the Agilent 432A mount resistance switch to 200Ω.
4. Set the DVM to measure resistance:
Agilent E4418B/E4419B Service Guide
Test Power Meter
Power
ref
Thermistor
mount
Figure 2-7: Output Standing Wave Ratio Test Setup
with the Agilent 432A power meter set to 200Ω:
• |R | ___________
1
with the Agilent 432A power meter set to 100Ω:
• |R | ___________
2
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.
Output Standing Wave Ratio (SWR) Test
Digital Voltmeter
V
RF
V
comp
Performance Tests
+ input
- input
2-25