[time-nuts] Warm-up of HP 8720D option 1D5 oscillator

Charles Steinmetz csteinmetz at yandex.com
Wed Oct 1 18:37:46 EDT 2014


David wrote:

>here is the frequency as the instrument is switched on,
>after being powered off for 2-3 hours.
>
>The oscillator appears to start too high in frequency, overshoots
>downwards, then settles down.

That is a typical warmup profile for an ovenized AT-cut crystal (OCXO 
with AT-cut crystal).

>it looks as if the oven is underdamped to me.

That is a nominal warmup performance.

Best regards,

Charles






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