Agilent Technologies 8564EC Service Manual page 105

Manual Adjustment Procedures
4. Sampling Oscillator Adjustment
Sampler Match Adjustment
1. Connect the negative DVM test lead to A15J400 pin 6, and the
2. Press
3. Adjust A15C100 SMPL MATCH to peak the voltage displayed on the
4. Record the displayed voltage in
5. Press
6. If the difference between the maximum and minimum voltages is
7. Locate the center frequency at which the voltage is lowest. Use the
8. Readjust SMPL MATCH to set the displayed voltage to 0.8 ±0.1 Vdc.
9. Set the spectrum analyzer center frequency to 2302.3 MHz and
10.Move the positive DVM test lead to A15J400 pin 3. Check that the
11.Disconnect the DVM probes from A15J400.
Table 3-9 Sampling Adjustments
Center Sampling
Frequency Oscillator
(MHz) (MHz)
2156.3 285.000
2176.3 286.364
2230.3 288.462
2263.3 290.000
2302.3 291.667
2158.3 293.478
128
positive DVM test lead to A15J400 pin 1.
and set the spectrum analyzer center frequency
FREQUENCY
to 2302.3 MHz. This sets the sampling oscillator to 291.667 MHz.
DVM.
displayed voltage for the sampling oscillator frequency of
291.667 MHz.
on the spectrum analyzer. Use the keypad to set
FREQUENCY
the spectrum analyzer center frequency to the frequencies listed in
Table 3-9 on page 128. At each listed frequency, record the displayed
voltage in the table.
less than 0.50 V, and all voltage readings are between +0.5 and
+2.5 Vdc, proceed to step 15.
keypad to set the spectrum analyzer to this frequency.
repeat steps 9 through 13.
measured voltage is the negative of the voltage at pin 1, within
±0.1 Vdc.
1st Trial
Table 3-9 on page 128
Displayed Voltage (Vdc)
2nd Trial 3rd Trial
as the
4th Trial 5th Trial
Chapter 3