Help identifying a part

[perdrix]

I'm fairly sure it is a capacitor, it has colour code bands and text saying "1P0" (I think).



Lead torn off so can't measure it (don't ask!  ).

Colours look like red, violet, green so it might be 27 * 1E5 = 270nF?  If that is the value, then I'm puzzled by the text marking of 1P0 

Does anyone recognise this and know the value type and voltage rating?

Thanks
Dave

[Gyro]

It's a ceramic plate capacitor - 1pF. The colours indicate dielectric type (I've only seen one colour before) at that value it will be NPO.

It's a very low value, something RF?

[perdrix]

It was in series with an 18M2 (Brown, Grey, Red, Green)  resistor across a Vishay S102L precision resistor (20K000 0.05%).  This resistor is part of a precision attenuator, and the R and C were mounted under the board.   The other resistor in the attenuator (289.3 Ohms) also has series RC trim under the board  in parallel with it (274K in series with a cap marked n22 AFAICT, so maybe 220pF).

The two main resistors appear in the schematic, but these under board parts don't.

If I had to guess, I would think they are there to trim the frequency response of the attenuator.

RU sure that it's 1pF?  Finding a leaded 1pF cap will be non-trivial.

Dave

[SeanB]

1pF is common, though you can replace it with a twisted wire adjuster cut to the right length. Easy to get as a NPO leaded part as well.

[perdrix]

I had some 1pF 0805 parts so used one of those.

Thanks, Dave