Agilent Technologies 8753ES Option 011 Service Manual page 259

Figure 7-25 Stable HI OUT Signal in FRACN TUNE Mode
A7 Pulse Generator Check with Oscilloscope
Perform this check if a spectrum analyzer is not available.
1. Remove the A4-to-A11 SMB cable from the A4 (R) sampler/mixer output. Connect the
oscilloscope to the A4 output (1st IF).
2. Activate the FRACN TUNE service mode and tune the fractional-N to 50 MHz. Press
SERVICE MENU
System
3. Activate the SRC service mode of the analyzer and tune the source to 50 MHz. Press
SRC ADJUST MENU SRC TUNE ON
4. Set the SRC TUNE frequency to those listed in
waveforms. They should appear similar to
• If the signals observed are proper, continue with
page 7-28.
• If the signals observed are questionable, use a spectrum analyzer to perform the
"A7 Pulse Generator Check with Spectrum Analyzer" on page
Table 7-7 1st IF Waveform Settings
SRC TUNE FRACN
50 MHz 50 MHz
250 MHz 50 MHz
2550 MHz 50 MHz
Chapter 7
SERVICE MODES
SRC TUNE FREQ
Table 7-7
Figure 7-26.
Harmonic 1st IF
1 1 to 6 MHz
5 1 to 6 MHz
51 1 to 6 MHz
Source Troubleshooting
FRACN TUNE ON
50 M/µ
and observe the 1st IF
"A11 Phase Lock Check" on
7-25.
Phase Lock Error
.
50 M/µ
.
7-27