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Old 7th April 2006, 08:00 PM   #11
Onra is offline Onra  Germany
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Hi AndrewT,
C0G and NP0 you will find at
http://en.wikipedia.org/wiki/NP0
This are class I dielectrics.
Class II mats are are also in the wiki:
http://en.wikipedia.org/wiki/EIA_Class_2_dielectric

Class II dielectrics have a high Epsilon and less linearity. This may be a main reason for their distortions in signal lines.

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Old 8th April 2006, 01:08 AM   #12
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Infinia, here's Bateman's test jig. Sorry for the resolution; it's as good as I could make it.
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Old 8th April 2006, 03:51 AM   #13
infinia is offline infinia  United States
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Yikes that'll break my eyeballs. Way too much detail. Couldn't even find the DUT. Would it be possible to draw something highly simplified? do it have DC bias with resistor impedance? AC generator levels/imp @1KHz, spectrum analzer used, etc

Alternatively if it's really a bother links on the web for tests like these that are handy. sorry this is interesting for me.
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Old 8th April 2006, 04:53 AM   #14
mzzj is offline mzzj  Finland
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Quote:
Originally posted by infinia


Alternatively if it's really a bother links on the web for tests like these that are handy. sorry this is interesting for me.
See if you can get "Electronics World" at your hands in library or whatever, C. Bateman had something like 12-part article spread over one year issues about capacitor distortion and its causes.

You can do sub-ppm distortion measurements relatively easily with ultra-low distortion oscillator, passive notch filter and mid-level PC soundcard equipped with FFT software. But first you need super-quality caps wich are polypropylene extended metal foil (not metallized film)
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Old 8th April 2006, 08:10 AM   #15
forr is offline forr  France
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Cyril Bateman used to sell a CD-rom full of his articles on caps (and many more). Send me an email and I'll send him your contact, I think he'll then contact you. Sorry for the procedure, but he had huge problems with his spammed email box and it is preferable to make contacts with him a bit complex.
For his sub-1ppm distortion test I built, I am looking for a freeware handy spectrum analyser using a PC-sound card. Any idea ?
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Old 8th April 2006, 08:21 AM   #16
mzzj is offline mzzj  Finland
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Quote:
Originally posted by forr

For his sub-1ppm distortion test I built, I am looking for a freeware handy spectrum analyser using a PC-sound card. Any idea ?
28euros for Audiotester is not that bad.
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Old 8th April 2006, 08:51 AM   #17
AndrewT is offline AndrewT  Scotland
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Hi,
now I've got it.
C 0 G is the EIA three character code for -0 +-30 ppm/Cdeg.

and this happens to be N P zero (NP0).

Thanks all.

Any response to cap variation with voltage for this type? ppm/V?
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Old 8th April 2006, 12:11 PM   #18
mzzj is offline mzzj  Finland
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Quote:
Originally posted by AndrewT

Any response to cap variation with voltage for this type? ppm/V? [/B]
Very low as distorition measurements show.
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Old 8th April 2006, 01:51 PM   #19
infinia is offline infinia  United States
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Mzzj,Forr,
Thank you for your kind suggestions. I will check my puplic/uni library for the WW publications when I go. I think it is important for the test diagram/conditions to be included with plots/test data when the information is to be analyzed correctly.

Praxis v2.14 in time domain has been used by others on this forum. FYI All PC SpAnalyzers use FFT in function.

For PC SA see the following link I found.
http://www3.ocn.ne.jp/~hanbei/eng-winanalyzer.html
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Old 8th April 2006, 02:21 PM   #20
jcx is online now jcx  United States
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Default free sw

RMAA -RightMark Audio Analyzer is popular, not very flexible

Audacity project at Sourceforge will help you grab/create/edit .wavs

Scilab (just checked, Scilab.org website is down over this weekend) has wav import and I think I've seen a useful looking analysis package in thier reference page - free matlab work alike has many of the heavy duty matlab toolboxes for signal analysis

Cyril's circuitry isn't the best for the application - considerable simplification can be had with indirect nonlinearity measurements of IM differences - no need to build a low distortion oscillator, better recent 24 bit sound cards can also add ~ 20 dB resolution vs his setup - esi juli@, emu 1212m are < us$200
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