19. 10 MHz Reference Adjustment (Option 003)
2.
Set the frequency counter controls as follows:
3.
4.
FUNCTION/DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FREQ A
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A:
X10
ATTN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF (DC coupled)
5002
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF (1 MR input impedance)
AUTO TRIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON
100 kHz FILTER A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
INT/EXT
switch (rear panel)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EXT
On the HP
5334A/B
Frequency Counter, select a 1 second gate time by pressing
IGATE
(iJ
[GATE).
Offset th
1 e
rsp
ayed frequency by -10.0 MHz by pressing
d’
MATH
[SELECT/ENTER)
[CHX/EEX)
Ilo)
ICHS/EEX)
@
(SELECT/ENTER)
(SELECT/ENTER).
The
frequency counter should now display the difference between the frequency of the INPUT A
signal and 10.0 MHz with a displayed resolution of 0.010 Hz (10
mHz).
Locate the FREQ ADJ control on the HP 8560A. This control is accessible through the
center deck of the spectrum analyzer. See Figure 2-22.
5.
6.
Remove the dust cap screw.
Use a nonconductive adjustment tool to adjust the FREQ ADJ control on the A21 OCXO
for a frequency counter indication of 0.00 Hz.
7.
8.
9.
On the HP
5334A/B
Frequency Counter, select a 10 second gate time by pressing
(GATE]
Ilo]
(GATE].
The frequency counter should now display the difference
between the frequency of the INPUT A signal and 10.0 MHz with a resolution of 0.001 Hz
(1
mHz).
Wait at least 2 gate periods for the frequency counter to stabilize, and then adjust the
FREQ ADJ control on the A21 OCXO for a stable frequency counter indication of 0.000
fO.O1O Hz.
Replace the dust cap screw on the A21 OCXO.
2-70 Adjustment Procedures
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