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Diode test and identify

Started by Steve Wolf November 3, 2019
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.
On Sunday, 3 November 2019 16:55:52 UTC, Steve Wolf  wrote:
> 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
thanks
On 2019-11-03, Steve Wolf <stevwolf58@gmail.com> wrote:
> 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
> 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.
Well I took it out of Circuit and now its reading

Forward .171
Reverse 1

Soo I guess its good.

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

> 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. -- 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.
Thanks.

Fv seems to match.
On Mon, 04 Nov 2019 03:42:13 -0800, Steve Wolf wrote:

> 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.
On Sunday, 3 November 2019 21:01:14 UTC, Steve Wolf  wrote:
> 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