Agilent Technologies 8719ET Service Manual page 229

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
7. Press
DAC NUM HIGH BAND
the front panel knob to get a signal of about 10 MHz displayed on the spectrum
analyzer.
8. Reconnect the network analyzer's PORT 1 to spectrum analyzer input.
9. On the spectrum analyzer, set these parameters:
8719ET/ES and 8720ET/ES models:
• center frequency = 4.45 GHz
• span = 200 MHz
8722ET/ES models:
• center frequency = 23.4 GHz
• span = 200 MHz
You should see a signal near the center frequency.
• If the signals appeared for both the low band and high band, you can assume that all
the assemblies are working correctly, with the exception of the A11 phase-lock
assembly.
• If the high band signal didn't appear, there could be a faulty A68 attenuator,
A25 switch (8722ET/ES only), A5 (source switch), A6 (source switch), or the
associated cables.
• If the low band signal didn't appear, there could be a faulty A57 fixed oscillator, A53
mixer/amp, A25 switch (8722ET/ES only), A5 (source switch), A6 (source switch), or
the associated cables.
• If neither low band or high band signal appears, there could be a faulty A54 YIG
oscillator (8722ET/ES only), A55 YIG oscillator, A11 phase-lock, A58 M/A/D/S, or the
associated cables.
Service Guide
on the network analyzer, and slowly turn
4000 x1
Source Troubleshooting
Broadband Phase Lock Problems
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