[time-nuts] Z3801A OCXO manual trimming
nova at npgcable.com
Mon Mar 5 11:21:33 EST 2018
Thank you, Hal, for these links and to others for your comments.
Setting the oven temperature on a turning point appears tedious. Perhaps there
is enough range in the frequency adjustment to put the oscillator back on
frequency - or close enough for the EFC to be effective. If not, I may have to
adjust the temperature, but time is limited.
Some measurements with the EFC disconnected and a calibrated frequency counter:
9999.815 KHz at Z3801A turn on
9999.9984 KHz highest frequency seen (temperature overshoot)
9999.9947 KHz approximate final frequency
The EFC does have wide range; it can almost pull the 5.3 Hz offset onto frequency.
> Does the oscillator have an adjustment? If so, is this somewhat accessible
> without destroying the assembly? Are there pictures of the oscillator
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