[time-nuts] LPRO testing

Bob Camp lists at rtty.us
Sat Jan 19 20:51:28 EST 2013


Hi

Watching the EFC sweep as it tries to lock can be a useful diagnostic tool.

Bob

On Jan 19, 2013, at 8:45 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Fellow time-nuts,
> 
> As I received a box of suspect LPROs I now have a largish amount of LPROs to test through.
> 
> I got the LPRO manual as well as the repair guide.
> 
> Seems like I need to solder up a connector and hook a few things up.
> 
> I will have to improvise on the heat-sink side until I find something useful.
> 
> I would think that I would sort them into a few different piles depending on the failure modes. By external observing I should see these:
> 
> 1) Heater problem (monitoring current would have heating gone or overheating)
> 2) Lamp problem (monitoring the lamp monitor output)
> 3) Lock problem (monitoring the BITE as well as frequency)
> 4) RF problem (monitoring the existence of RF output)
> 
> What else did can people think off?
> 
> I think the above would work as a systematic check-list.
> 
> Now, I'd love to hear about hints and tips from you folks.
> 
> Cheers,
> Magnus
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