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Diode test and identify

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Steve Wolf
Guest

Sun Nov 03, 2019 6:45 pm   



trying to fix AC/DC power plug.

I have a Diode that says:
GW327
SR560

I THINK this is a Schottkty Diode.

Setting meter to Diode test,
Im getting, 1.71 Forward and
Reverse .171.

Normally on diode I know you should get 1 on reverse

Are these readings allowable or is the Diode Bad.

Thanks.


Guest

Sun Nov 03, 2019 6:45 pm   



On Sunday, 3 November 2019 16:55:52 UTC, Steve Wolf wrote:
Quote:
trying to fix AC/DC power plug.

I have a Diode that says:
GW327
SR560

I THINK this is a Schottkty Diode.

Setting meter to Diode test,
Im getting, 1.71 Forward and
Reverse .171.

Normally on diode I know you should get 1 on reverse

Are these readings allowable or is the Diode Bad.

Thanks.


1.7v one way round 0.17v the other shows it's shorting.


NT

Steve Wolf
Guest

Sun Nov 03, 2019 9:45 pm   



thanks

Jasen Betts
Guest

Sun Nov 03, 2019 10:40 pm   



On 2019-11-03, Steve Wolf <stevwolf58_at_gmail.com> wrote:
Quote:
trying to fix AC/DC power plug.

I have a Diode that says:
GW327
SR560

I THINK this is a Schottkty Diode.


SR560 is a 5A schottky rectifier diode with 60V reverse bias capability

Quote:
Setting meter to Diode test,
Im getting, 1.71 Forward and
Reverse .171.

Normally on diode I know you should get 1 on reverse


Normally you get the out-of-range symbol in reverse, many meters display
that as a "1" at the left and no other digits.

> Are these readings allowable or is the Diode Bad.

If those readings are made with the diode removed from the circuit,
it's definately bad. else probably bad.

--
When I tried casting out nines I made a hash of it.

Steve Wolf
Guest

Sun Nov 03, 2019 10:45 pm   



Well I took it out of Circuit and now its reading

Forward .171
Reverse 1

Soo I guess its good.

Rats.

Cursitor Doom
Guest

Mon Nov 04, 2019 1:45 am   



On Sun, 03 Nov 2019 13:01:11 -0800, Steve Wolf wrote:

Quote:
Well I took it out of Circuit and now its reading

Forward .171 Reverse 1

Soo I guess its good.

Rats.


Schotkeys do have lower barrier potentials than normal diodes. A typical
silicon diode has a barrier potential of between 0.6 and 0.7 volts;
schotkeys less than half that so it seems slightly low but probably still
good. You can always look up the datasheet for that particular diode and
see what the Vf should be just to be on the safe side.





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Steve Wolf
Guest

Mon Nov 04, 2019 12:45 pm   



Thanks.

Fv seems to match.

Cursitor Doom
Guest

Tue Nov 05, 2019 1:45 am   



On Mon, 04 Nov 2019 03:42:13 -0800, Steve Wolf wrote:

Quote:
Thanks.

Fv seems to match.


Then it would appear that diode is fine.



--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.


Guest

Tue Nov 05, 2019 5:45 am   



On Sunday, 3 November 2019 21:01:14 UTC, Steve Wolf wrote:
Quote:
Well I took it out of Circuit and now its reading

Forward .171
Reverse 1

Soo I guess its good.

Rats.


Yep. Hard for anyone to help if you give us so little info.


NT

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