Procedure - Agilent Technologies 8564EC Service Manual

Manual Adjustment Procedures
7. 10 MHz Reference Adjustment — OCXO

Procedure

Failure to allow a 24 hour minimum warmup time for OCXO frequency
NOTE
and temperature stabilization may result in oscillator misadjustment.
1. Connect equipment as shown in
If the reference is set to
NOTE
warmup for the OCXO before continuing. When the 10 MHz reference
is set to
2. Set the frequency counter controls as follows:
3. Select a 1 second gate time on the 5334A/B frequency counter by
4. To offset the displayed frequency by −10.0 MHz, press MATH,
5. Locate the FREQ ADJ control on the spectrum analyzer. This control
6. Remove the dust-cap screw.
138
a. Press to turn the spectrum analyzer on. After the automatic
LINE
power-on adjustment sequence is complete, press
ensure that the frequency reference is set to internal.
b. Allow the spectrum analyzer to remain powered on continuously
for at least 24 hours to ensure that the A21 OCXO temperature
and frequency stabilize.
, the OCXO is not operating or warmed up.
10 MHz EXT
c. Connect the frequency standard to the frequency counter rear
panel TIMEBASE IN/OUT connector.
d. Connect a BNC cable between the spectrum analyzer rear panel
10 MHz REF IN/OUT connector and INPUT A on the frequency
counter.
Function/data .............................................................. FREQ A
Input ........................................................................................ A
×10 Attenuator ................................................................. OFF
AC ............................................................... OFF (DC coupled)
50ΩZ . ..................................... ..OFF (1 MΩ input impedance)
Auto Trigger ......................................................................... ON
100 kHz filter A .................................................................. OFF
INT/EXT switch (rear panel) ............................................. EXT
pressing , 1,
GATE TIME
,
SELECT/ENTER CHX/EEX
. The frequency counter should now display the
SELECT/ENTER
difference between the frequency of the INPUT A signal and
10.0 MHz with a displayed resolution of 0.010 Hz (10 MHz).
is accessible through the center deck of the spectrum analyzer. See
Figure 3-16 on page
Figure 3-16 on page 137
, press
10 MHz EXT 10 MHz INT
.
GATE TIME
, 10, , 6,
CHS/EEX
137.
as follows:
to
PRESET
. Allow the 24 hour
,
SELECT/ENTER
Chapter 3