What's with this cap marking?

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Oznog

Active Member
I have some mylar caps I bought from AllElectronics surplus awhile ago (they no longer stock them) that seem to be labelled ".022K". AllElectronics sold it as 0.022uF.

Now I'm a bit perplexed by this. Why give a value of .022 and then multiply by 'K'? Why not give a straight "22"? I'm used to the number being picofarads. 22 pF is not 0.022uF, it's 0.000022uF. That's not the value AllElec gave and I think the cap's size would be a bit large for 22pF.

What's the correct way to read that vaue?
 

It's printed as 0.022, and that's what it is, 0.022uF, as it was sold to you. The 'k' doesn't refer to the value at all, if you search the forums someone explained previously what the letters all mean.
 
And since I have them so handy, here they are again. Print, cut and clip to your bench or paste into your handy shop notebook.


B = ±0.1pF
C = ± 0.25pF
D = ±0.5pF
E = ±0.25%
F = ±1.0%
G = ±2%
H = ±2.5%
J = ±5%
K = ±10%
L = ±15%
M = ±20%
N = ±30%
P = -0, +100%
S = -20, +50%
W = -0, +200%
X = -20, +40%
Z = -20, +80%


Dean
 
And here's a thread on the Nuts & Volts forum where this topic is posted. The topic appears at least bi-weekly somewhere!

**broken link removed**
 
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