Agilent Technologies 8564EC Service Manual page 422

Synthesizer Section
Unlocked YTO PLL
Figure 11-7 Troubleshooting an Unlocked YTO PLL
5. Calculate the YTO frequency error by subtracting the frequency
recorded in step 3 from the frequency recorded in step 4. Record the
result below:
YTO Frequency Error = _______________________MHz
YTO frequency error = YTO frequency
frequency
6. On the spectrum analyzer, press
DIAGNOSE
below:
Fractional N frequency = _______________________MHz
7. If the YTO frequency error recorded in step 5 is greater than
20 MHz, do the following:
• Check the YTO adjustments using the automated adjustment in
554
(CALCULATED)
, and
FRAC N FREQ
Chapter 2 or the manual adjustment in Chapter 3.
(MEASURED)
,
MORE 1 OF 2 FREQ
. Record the fractional N frequency
−YTO
Chapter 11