Source And 11 Phase Lock Check - HP 8753D Option 011 Service Manual

A3 Source and A Phase Lock Check
This procedure checks the source and part of the phase lock assembly. It opens the
phase-locked loop and exercises the source by varying the source output frequency with the
11 pretune D C.
If the analyzer failed internal test 48, default pretune correction constants
Note
were stored which may result in a constant o set of several MHz. Regardless,
continue with this procedure.
Use a spectrum analyzer for problems above 100 MHz.
Note
1. Connect the oscilloscope or spectrum analyzer as shown in Figure 7-1. (Set the oscilloscope
input impedance to 50 ohms.)
2. Press
RESET SYSTEM
5
to activate the source tune (SRC TUNE) service mode.
RC TUNE FREQ
3. Use the front panel knob or front panel keys to set the pretune frequency to 300 kHz, 30
MHz, and 40 MHz. Verify the signal frequency on the oscilloscope.
In SRC TUNE mode, the source output frequency changes in 1 to 2 MHz
Note
increments and should be 1 to 6 MHz above the indicated output frequency.
4. Check for the frequencies indicated by Table 7-1.
etting
00 kHz
0 MHz
40 MHz
RAFT
3/21/106 15:13
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
ERVICE MENU ERVICE MODE
5
Table 7-1. Output Frequency in SRC Tune Mode
RC ADJU T MENU
Observed Frequency
1. to 6. MHz
1 to 6 MHz
41 to 46 MHz
Source Troubleshooting 7-7
RC TUNE ON