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Old 19th June 2003, 10:11 PM   #1
cm961 is offline cm961  Canada
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Question Identifying this damn cap?

Hey guys,

I may be the only one, but I find caps hard to identify. I've got a bunch here labeled:

MDC Z5U
1000M
1.5K V

the other side is blank. The case is like a ceramic cap only thicker. I also have some tantelum caps that say:

224
ADP

on one side and

270
AIJ

on the other. So whats the deal, is it 220000pF or 27pF...? Its a tiny cap, so I'm guessing 27pF.

Pete

P.S. Yes, you can freely make fun of me...
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Old 24th June 2003, 09:30 PM   #2
raindog is offline raindog  Romania
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can you post some pictures? for the MDC's those labels don't make much sense asociated with the case. as for the other ones they are 220 nanoF at 270 volts
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Old 24th June 2003, 09:34 PM   #3
raindog is offline raindog  Romania
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me again; the only way to be sure about the values is to measure them with a dmm (one that can measure caps in a farely wide range)
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Old 24th June 2003, 10:53 PM   #4
dhaen is offline dhaen  Europe
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Default Conflicting information?

I say....

The tantalums are 22*10E4 = 0.22uF. They don't make tant's much lower in value. No idea of the voltage.

How big are the others? They sound like:
1000mF = 1uF But they'd be big in size for this value.

Cheers,
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Old 24th June 2003, 11:08 PM   #5
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first cap is a mov (varistor) if it looks like a thick ceramic capacitor
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Old 24th June 2003, 11:13 PM   #6
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MDC Z5U
1000M
1.5K V

Z5U is a well-known code for a very bad ceramic dielectric. M is probably a tolerance code, meaning +/- 20%, which is a good value for the initial tolerance at room temperature and low voltage for Z5U capacitors (they vary more over their temperature and voltage ranges). 1000 is then almost certainly the capacitance in pF and 1.5KV denotes a 1.5kV maximum working voltage.

All in all, these are very bad 1000pF +/-20% ceramic high voltage capacitors, capable of handling 1.5kV.
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Old 25th June 2003, 12:10 PM   #7
cm961 is offline cm961  Canada
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Thanks for the replies guys. I think I've pretty much got them figured out now, but can anyone suggest a good (ie. cheap) DMM for testing capacitance?

Pete
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