Chapter 7 7-9
Source Troubleshooting
Phase Lock Error
NOTE If the analyzer failed internal test 48, default pretune correction constants
were stored which may result in a constant offset of several MHz. Regardless,
continue with this procedure.
NOTE Use a spectrum analyzer for problems above 100 MHz.
1. Connect the oscilloscope or spectrum analyzer as shown in Figure 7-1. (Set the
oscilloscope input impedance to 50 ohms.)
2. Press
to activate the source tune (SRC TUNE) service
mode.
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.
NOTE In SRC TUNE mode, the source output frequency changes in 1 to 2 MHz
increments and should be 1 to 6 MHz above the indicated output frequency.
4. Check for the frequencies indicated by Table 7-1.
5. The signal observed on an oscilloscope should be as solid as the signal in Figure 7-4.
Figure 7-4 Waveform Integrity in SRC Tune Mode
Table 7-1 Output Frequency in SRC Tune Mode
Setting Observed Frequency
300 kHz 1.3 to 6.3 MHz
30 MHz 31 to 36 MHz
40 MHz 41 to 46 MHz
Preset System
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