[sdiy] Tempcos of Xicon and LCR polystyrene caps

[Andre Majorel]

On 2006-06-15 16:57 -0600, Ian Fritz wrote:
> At 11:58 PM 6/14/2006, Grant Richter wrote:
> 
> >>The LCR FSCEX polystyrene caps are five times more expensive. That
> >>may be because they are more precise (1% vs. 5% for the Xicon
> >>parts) but they also claim -50/+110 PPM/°C.
> >
> >There is a tolerance for the slope of the curve. If -250 ppm / deg C
> >is spec then tolerance says actual slope can vary from  -300 ppm /
> >deg C to -140 ppm / deg C.
> 
> 
> I'm pretty sure this is being read wrong.  It says -110+-50, which I think 
> is meant as (-110) +/-  (50).  Da? 

It was read wrong. The Farnell product detail page says 

  Coefficient de température -:50ppm/°C;
  Coefficient de température, +:110ppm/°C;

Which I interpret as "+50 PPM/°C <= TC <= +110 PPM/°C". Wrong sign.

The data sheet says "-110 + 60PPM/°C", whatever that might mean.

-- 
André Majorel <amajorel at teaser.fr>
http://www.teaser.fr/~amajorel/