Re: 2245A mains filtering
Although the allowable range of capacitors for a linetoggle quoted messageShow quoted text
filter are quite large, not all X and Y class filter caps
are used in the line filters. They are quite often used
as snubber capacitors in switching circuitry... where their
value is somewhat critical to efficient operation.
There should be absolutely no problem getting exact matches
for the X and Y capacitors in a Tek scope. Go to DigiKey,
or Mouser. Use film type rather than paper type. Your biggest
issue will be size. You may have to bend the leads on the
newer smaller capacitors to fit the holes in the circuit board...
Or, alternatively, you can specify higher voltage rating
capacitors, as they will be more likely to be the exact physical
Why are you singling out the X and Y caps? In the spectrum of
part failures, they are more reliable, and less important to the
function of the scope, than any electrolytic capacitor. I have
never had one that I *HAD* to replace because it failed... I have
had many that I replaced because of cracked epoxy coatings, and
because customers insisted I do so...
Corcom is a very good filter company. I have never had
one of their products fail electrically. I have seen a few
that were ripped out of the panel, but I don't think that was
a fault of manufacture... it looked deliberate.
Schafner, on the other hand....
It is also rare for any power line filter module to fail if it
is run from US 120V power... But quite common if it is run from
EU 240V power, especially if the utility runs to the high side
of tolerance, like the UK.
Brian Cockburn wrote: