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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