Am 25.02.2018 um 00:45 schrieb [email protected]:
Hi,
I'm working to make some replacement A9 boards for the HP 5065A to the
new style schematic.
Will share the Gerber file when done.
The integrator capacitor is a 1986 vintage TRW 5.0ufd 50V 10% .42"DX1.0"L
axial.
Of course it has an HP part number and no manufactures #.
Any guess as to what type it is?
Polycarbonate, polypropylene, ???????
Just wanting to find a good modern replacement for its use. (Integrator
with a 50ms time constant.)
50 ms integration time and 5uF+-20% does not sound like a
leakage current problem. Polypropylene seems good enough.
Teflon would be a joke. I might even go with WIMA MKS4
(Polyester) if I had them in the drawer. Dielectric absorption
is also not a problem at these impedance levels and time constants.
When I recapped the electrolytics in my 4274A RLC bridge, it was
hard to find capacitors that fit the board footprint of the old ones.
Usually I had to choose 2 or 3 times the voltage so that they would
fit the board. But that is a luxury problem. :-)
<
https://www.digikey.de/products/de/capacitors/film-capacitors/62?k=&pkeyword=&FV=e340004%2Ce340007%2Ce340055%2C1f140000%2Cmu4.7%C2%B5F%7C2049%2Cmu5.1%C2%B5F%7C2049%2Cmu5%C2%B5F%7C2049%2Cffe0003e&quantity=0&ColumnSort=0&page=1&stock=1&pageSize=25
>
Mouser.com should have just as much.
regards, Gerhard
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