[time-nuts] FRSC problem
cdelect at juno.com
Sat Oct 18 00:24:56 UTC 2008
Use a 50 ohm termination on the counters input and use a 1 second gate
Power up from a cold start (off at least 1/2 hour) and watch the
frequency or the control voltage. The frequency should vary about 50 hz
or more as the control voltage sweeps about 15 volts. As it warms up it
should start sweeping across the center frequency of 10Mhz. If it stops
sweeping after 8 or so minutes it is most likely locking.
Depending on how the lock pin is configured it could be open collector
(useing a DVM on the ohms semiconductor position with the + lead on the
lock pin and the other to ground, will read open until locked and then
read a low value when locked.) or it could be wired to give a TTL level
output when locked. Lamp voltage shopuld be > 8VDC. Hope this helps.
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