OPERATOR MAINTENANCE AND ADJUSTMENTS
5.5.1 OSCILLATOR ADJUSTMENT (Routine Adjustment)
The following paragraphs are to be used in the adjustment of the various oscillators, which may
be used in the TymMachine:
A. STANDARD TCXO OSCILLATOR ADJUSTMENT (location Y2 if
applicable):
a. If the generator isn’t running, start it. From the Versatile Display function
menu select GENERATOR/OPERATE/START.
b. Sync one channel of an oscilloscope with a pulse rate output from the unit
(preferably 1KPPS found in rear panel connector J3 pin 1.)
c. Connect a stable oscillator of known frequency to the other input channel
of the oscilloscope. Note that the stability and accuracy of the External
Oscillator must be better that that of the Internal Oscillator.
d. Make sure that the Sync Gen is disabled. From the Generator control
menu (the menu containing Stop, Start etc. as in Step c above) select
SYNC/SYNC-GEN/DISABLE.
e. Adjust the COARSE oscillator adjustment (with an insulated tuning tool)
for the most stable display possible. It should not drift either left or right.
B. OPTIONAL OVEN OSCILLATOR ADJUSTMENT (location Y3 if
applicable):
a. If the generator isn’t running, start it. From the Versatile Display function
menu select GENERATOR/OPERATE/START.
b. Remove the dust cap screw from the side of oscillator.
c. Sync one channel of an oscilloscope with a pulse rate output from the unit
(preferably 1KPPS found in rear panel connector J3 pin 1.)
d. Connect a stable oscillator of known frequency to the other input of the
oscilloscope. Note that the stability and accuracy of the external oscillator
must be better than that of the internal oscillator.
e. Make sure that the Sync Gen is disabled. From the Generator control
menu (the menu containing Stop, Start etc. as in Step c above) select
SYNC/SYNC-GEN/DISABLE.
f. Adjust the COARSE oscillator adjustment (with an insulated tuning tool)
for the most stable display possible. It should not drift either left or right.
Symmetricom, Inc. TM7000 TymMachine TCG/T (Rev D) 5-9
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