512 Chapter10
Synthesizer Section
Synthesizer Troubleshooting Section
Frequency standard EXT
Power level −5dBm
23.Set the HP 8560E/EC to the following settings:
Span .................................................................................0Hz
Trigger .......................................................................... Single
24.Set the HP 8560E/EC and HP 8340A/B frequencies to the
combinations listed in Table 10-2 on page 513 and press
SGL SWP on
the spectrum analyzer.
Figure 10-2 Sampler and Sampling Oscillator Test Setup
25.At each combination, the frequency counter should measure a
sampler IF as shown in Table 10-2 on page 513. (The sampling
oscillator of the offset PLL tunes to the frequencies listed in the
table.) If the frequency counter does not read the indicated sampler
IF ±10 kHz, suspect the A15 RF assembly.
26.Reconnect W34 to A15U100J1 and W32 to A15J101.
27.The 1ST LO OUTPUT, located on the front panel, must be
terminated in 50 Ω. If the YTO unlocks only with certain center
frequency and span combinations, check that the termination is in
place.
28.Set the HP 8560E/EC
CENTER FREQ and SPAN to generate the
unlock conditions.
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