[time-nuts] HP10811 problem - wrong frequency

Tim Shoppa shoppa at trailing-edge.com
Sun Jan 13 15:12:43 EST 2008

Jim Miller schrieb:
>> i have a problem with my HP10811 ocxo. I connected it properly to 24V, 12V 
>> and to my counter to measure its frequency. The measured frequency is 10.887 
>> MHz, but it should be 10MHz (also noted on the 10811). A 5MHz tcxo is 
>> measured correctly, so i think the counter is okay. Can anyone help me ?
> There is a thermal fuse on the oven control board which sometimes
> blows due to age, or it vibrates out, or otherwise fails.  This causes
> the oven to not operate and the unit is guaranteed to be off frequency
> by a large amount.

Wow, it's interesting to see what "large amount" means to different

To some, it's a few parts per billion.

To others, it's nearly 10% (umm, ninety million parts per billion).


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