[time-nuts] Anyone familiar with SR-620 repair?
jfor at quikus.com
Fri Mar 23 21:08:55 UTC 2012
Are there Hall Effect probes for chasing DC faults?
I'm very familiar with the HP Logic Current Tracer, but AFAIK that is only
sensitive to fast pulses, from the Logic Pulser for example.
The threashold is adjustable, so maybe it will sense DC currents.
If it is DC sensitive it'd be even more wonderful. I'll try it after dinner.
> Shame you do not have a Hall effect probe to drag down the trace.
> John WA4WDL
> From: "Magnus Danielson" <magnus at rubidium.dyndns.org>
> Sent: Friday, March 23, 2012 4:58 PM
> To: <time-nuts at febo.com>
> Subject: Re: [time-nuts] Anyone familiar with SR-620 repair?
>> On 03/23/2012 09:30 PM, J. Forster wrote:
>>> I should have added that you can get a pretty good idea of whick branch
>>> a PCB is drawing current by probing along the trace. This is especially
>>> useful if the rail has a bunch of branch distribution lines.
>>> Also, if the three-terminal regulator is overheating, disconnect it and
>>> power just that rail from an external, current limited supply of a volt
>>> two. That way you don't risk trace damage.
>> I would toss the TDR on it just for the fun of it, but a miliohm
>> measurement should also help to locate it. Otherwise if there is no
>> evidence (hot cap or other chip) lifting legs of caps on speculation can
>> be a starter.
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