Hello,
yes - if you want to, you can dremel in and replace the battery
with an external one...
Tam
With best regards
Tam HANNA
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On 2020. 02. 24. 4:49, Jim Ford wrote:
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Thanks, Tam.
That's probably relatively easy to remedy.? I did such a
repair on a Tek logic analyzer.?
Jim
Sent from my
Verizon, Samsung Galaxy smartphone
-------- Original message --------
Date: 2/23/20 4:51 PM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Schaffner
Filtered Power Entry Module (HP54504A 400MHz scope)
Hello,
pardon my aging brain, but AFAIK,
BTW, this scope also fails the Analog Trigger, DAC, and ADC
self-tests.? Any insights on how to rectify those?
is caused by dead NVRAM bat
With best regards
Tam HANNA
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On 2020. 02. 24. 0:55, Jim Ford
wrote:
Hi, everybody.
I finally got around to opening up my 54504A scope to see
if it had the dreaded Schaffner filter.? No, it says Corcom on
the side.? Are the Corcom ones immune to the Rifa cap smokeout
failure?? I was going to check and replace it if necessary
because a coworker is doing a Mouser order in the next week or
so, and he asked me if I needed anything.
BTW, this scope also fails the Analog Trigger, DAC, and ADC
self-tests.? Any insights on how to rectify those?
Thanks.
Jim Ford
------ Original Message ------
Sent: 2/3/2020 8:42:35 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Schaffner
Filtered Power Entry Module (HP54504A 400MHz scope)
Greetings,
We have some custom equipment running on 208
VAC 60 Hz in the USA. ?We originally used Schaffner line
filters with rated voltage and current specifications
allowing for acceptable safety margins.
Several of these input filters exhibited
catastrophic failures.
Upon close examination we found that the
¡°plastic¡± insulator on one of the filter output terminals
appeared to suffer thermal damage (more or less melted)
allowing one of the line terminals to move through the
melting material and make contact with the grounded metal
housing. ?Thus the ¡°big bang¡±.
I too recommend replacing the filter with a
different unit because it does protect the scope from
inbound transient noise.
Regards,
Ken
On 2Feb, 2020, at 3:35 PM, Paul Bicknell
<
paul@...>
wrote:
Hi Andre
?
Most of
us have had this experience ?and as we
use 240 volts in the?UK?we
see it quite often?
?
My best
advise is to replace it with a good
quality one from a reputable supplier
such as digekey ??but not amazon?
The
worst you could do is wire it out as
the filter also stops noise coming
into the equipment?
Paul?
?
Hi
I have the HP54504A 400MHz
oscilloscope whose filtered line input
module suffered catastrophic breakdown
(a cloud of smoke with brown goo
emanating from the on/off switch) I
wonder if one can use other versions
of these online filters or must it be
the exact one viz. FN393-2,5-05-12?
Any idea what would happen if I
bypassed this filter temporarily.?
Thanking you
AndreH?
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