HP 8560A, Service Manual

Page: 373 / 450

22. Place jumper in the NORMAL position and reconnect W34 to
23. Set the HP 8560A to the following settings:
CENTER FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24. Place jumper A14J23 in the TEST position.
25. Disconnect W32 from Monitor the Sampler IF output SAMPLER
IF) with a synthesized spectrum analyzer such as an HP or HP
26. The Sampler IF should measure between 74 MHz and 114 MHz at -15 to
If the signal frequency or amplitude is incorrect, refer to “Unlocked Offset PLL” in this
chapter.
27. Set jumper A14J23 in the NORMAL position. Reconnect W32 to
Note
The All YTO has an initial pretune accuracy of MHz. However,
when the Roller Oscillator frequency is MHz, this is changed to
MHz. If the Roller Oscillator is MHz, the accuracy is changed
to MHz. This is done by changing the Main Coil Coarse DAC to
keep the Sampler IF within the acquisition range of the YTO Loop. When
dealing with the Sampler IF and an unlocked YTO, the same frequency
differences apply to the Sampler IF.
28. Set the HP 8560A to the following settings:
CENTER FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29. Connect an RF signal-generator’s output to Set the signal generator to the
following settings:
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...84 MHz
Amplitude
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..OdBm
30. Monitor pin 1 with a DVM or oscilloscope.
31. As the signal generator’s frequency is increased to 104 MHz, the voltage at pin 1
should change from f8.2 to -8.2 Vdc V.
32. Set the signal generator to the following settings and repeat step 23.
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...84 MHz
Amplitude
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -15
Synthesizer Section O-29