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 Post subject: 22uf @ 450v measures 40uf
PostPosted: Sep Tue 10, 2019 1:40 pm 
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As some of you know, I purchased Capacitorworld.net inventory last month. I have a box of about 2000 22uf@450 electrolytics that measures 40uf give or take 1uf. Now these measures about 3/16th of a inch larger then my stock of 22uf@450v capacitors. It is not my capacitor meter as I have 3 of them and my stock of 22uf measures 22uf on the 3 meters I use. The only thing I can think of is they are mislabeled, maybe they were manufactured as 40uf but the labeled them as 22uf as the manufacturer had made a mistake when capacitor world ordered them and just labeled them as 22uf?

Just a FYI, the 22uf@400v I purchased from capacitor world measure 22uf.

Now what to do with them....

Sal

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Last edited by Sal Brisindi on Sep Wed 11, 2019 2:42 am, edited 1 time in total.

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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Tue 10, 2019 1:51 pm 
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What does that specific manufacturer's spec sheet say about tolerances for their parts?

In the past, a tolerance of +100% was not unheard of for electrolytics as they lose capacitance as they age in use. But it's also quite likely they are mislabeled. For that matter, if they are mislabeled, you would have no way of knowing what the actual voltage rating is either.

You could always sell them in big lots maybe 100 pieces at a time, here on ARF or on eBay and clearly show what they measure on a cap tester, state you suspect they have been mislabeled by the manufacturer and let the buyer make their own decision. That way they go away quickly.

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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Tue 10, 2019 1:56 pm 
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Might be useful for those who do a lot of restuffing, as the mislabeling wouldn’t show to confuse anyone.

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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Tue 10, 2019 1:58 pm 
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Dennis,
Since the physical size is is slightly larger and the diameter is the same, I assume the voltage is correct but I to make sure, I am testing it now with 450 volts going to it to see if the capacitor gets warm.

Thanks,
Sal

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Last edited by Sal Brisindi on Sep Tue 10, 2019 4:36 pm, edited 2 times in total.

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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Tue 10, 2019 2:16 pm 
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Use a Ua current meter in series with power, when voltage limit is reached cap will begin to draw current.

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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Tue 10, 2019 3:14 pm 
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So far 450v applied to the 22uf capacitor for 1 hour and the capacitor is cool to the touch, I bumped it to 475 volts now.

I didn't connect a Ua meter to the capacitor yet, the digital milliamp I have on shows 000.0 milliamps.

Sal

UPDATE: I had the power supply set to 450 volts for 1 hour then bumped it up to 475 volts for another 90 minutes and the capacitor was cool to the touch, so its safe to say the capacitors are rated for 450v.

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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Tue 10, 2019 10:14 pm 
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Well that's a bummer. Especially at that volume (2000). I agree with discounting them for sale here and Ebay. Show pictures of 2 meters for Ebay. Not us. We believe you. Use your cool label maker and label the bag in large red letters. 40u 450V when you bag them.

Freeman


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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Wed 11, 2019 2:25 am 
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Freeman wrote:
Well that's a bummer. Especially at that volume (2000). I agree with discounting them for sale here and Ebay. Show pictures of 2 meters for Ebay. Not us. We believe you. Use your cool label maker and label the bag in large red letters. 40u 450V when you bag them.

Freeman


That is what I think I am going to do.

Sal

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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Fri 13, 2019 2:02 am 
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They should be good for the second filter cap in just about any radio.

Steve

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 Post subject: Re: 22uf @ 450v measures 40uf
PostPosted: Sep Fri 13, 2019 1:49 pm 
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Bringing any to Kutztown?


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