Anritsu 680 C Series, Maintenance Manual

Page: 114 / 317

Alternate
Reference
Oscillator
Calibration
This 100 MHz Reference Oscillator calibration pro-
cedure is an alternate to Step 6 of the Preliminary
Calibration procedure (page 4-15).
NOTE
If this procedure is used as a substitute for
Step 6 of the Preliminary Calibration pro-
cedure, you must still perform Steps 7, 8, 9,
and 10 to complete preliminary calibration
of the 690XXB/691XXB.
6a. Calibrate the 100 MHz Reference Oscillator as
follows:
a. If Option 16 (High Stability Time Base) is in-
stalled, disconnect the cable at A3J6.
b. Connect the Frequency Reference 10 MHz
OUTPUT to the
10 MHz REF IN
connector on
the 690XXB/691XXB rear panel.
c. On the 690XXB/691XXB, press the
SYSTEM
main menu key. At the System Menu display,
press
Cal Menu
to go to the Calibration Menu.
d. Press
Refrnce Cal
to begin calibration. The
Calibration Status Menu is displayed.
e. Press
Proceed
to start the calibration. The
date parameter opens for data entry.
690XXB/691XXB MM 4-17
6 9 0 X X B / 6 9 1 X X B
F r e q u e n c y C o u n t e r
1 0 M H z
E X T I N
1 0 M H z
R E F I N
I n p u t 1
R F O U T
1 P P S
1 . 5 M H z
1 0 M H z
A B S O L U T E T I M E
M o d e l 3 0 0 F r e q u e n c y R e f e r e n c e
E S C
1 2 3
4 5
6
-
D E L
7 8 9
. 0
E N T E R M O D
F r e q u e n c y R e f e r e n c e
1 0 M H z
O U T P U T
( P a t h f o r S t a n d a r d U n i t )
( P a t h f o r U n i t
w / O p t i o n 1 6 )
( U s e w i t h O p t i o n 1 6 )
Figure 4-2a. Equipment Setup for 100 MHz Reference Oscillator Calibration (Alternate Method)
PRELIMINARY
CALIBRATION CALIBRATION