[time-nuts] 53230A input channel fault?

Adrian Godwin artgodwin at gmail.com
Wed Nov 19 10:17:41 EST 2014

I recently got a used 53131A. It had the same problem, even though the
BNC connectors are fixed to the front panel.

On Wed, Nov 19, 2014 at 2:18 PM, Anders Wallin
<anders.e.e.wallin at gmail.com> wrote:
> A colleague of mine had seen this exact same behavior on another 53230A.
> The problem is a narrow trace right after the CH1 BNC input.
> http://www.anderswallin.net/2014/11/53230a-counter-input-channel-fix/
> There might be some chemical corrosion going on, since the other counter
> that experienced this problem had definitely not been subjected to
> overvoltage or other abuse. Or perhaps it's a mechanical issue where the
> BNC-connector over time bends the PCB+trace. The BNCs don't appear
> mechanically anchored to the front-panel, they are just soldered to the PCB
> and stick out through holes in the front panel.
> We have one of the 100ps models and probably a third 20ps model also - time
> will tell if these will break in the same way...
> Agilent/Keysight - are you listening?!? fix it please :)
> Anders
>> Hi all,
>> >
>> > I have a 53230A that behaves differently on ch1 and ch2.
>> >
>> > With ch2 at DC/1Mohm/postive-slope/1V it triggers ok on my PPS signal and
>> > shows e.g. a pusle-width measurement etc.
>> > The same signal connected to ch1 fails to trigger.
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