What type of rf filter is this?

[krugerand]

I am trying my best to fix the electronics in a mass spectrometer.One of the voltage generation boards doesnt receive any power at all (normally 230V AC is going into it) and I was able to trace live power only up to an RF filter before the power gets to the high voltage board.

I think I need to replace this RF filter because I can measure 160 ohms through one of the two paths through the filter but 38 Megaohms through the other path(which I assume means it is not an open path).

The filter casing has the following printing on it.

F&T 9768
0.1 uF + 2 X 2500 pF
+ 2 X 2 mH 4A
HSF560 2/94
250V~

Does anyone know what type of RF filter this is exactly? I think it was manufactured in
Germany in 1994 but I can't find it through Google. Maybe because its too old.

Any ideas and suggestions are appreciated.

Thanks, krugerand.

 

[Resqueline]

That looks like an ordinary mains RFI filter. On rare occations the inductor in these can develop a break. You can replace it with just about any similar rated product.

 

[krugerand]

Thanks for the info.

Yes, one path through the filter is open circuit so I guess as you say one of the inductors must have blew.

Would a part 5VR3 be a suitable replacement?
http://www.cor.com/PDF/R.pdf

The inductance and capacitance values are different though. Would that make a lot of difference in the filtering?

krugerand

 

[Resqueline]

It'll work just nice, but it might be more expensive than neccessary because it's a two-stage filter whereas the original filter is just one stage.
It will surely make a difference (to the better), but the exact filtering effect is very non-critical on such device mains inputs.