[TechAssist] Re: Zener diode test
- From: "Rich M" <rmsrepair@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 11 Jun 2005 07:42:55 -0500
Scott I would be interested in the pdf for the zeiner tester.
thanks
>From: Scott Beebe <Scott@xxxxxxxxxxxxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: Jim Myers <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] Re: Zener diode test
>Date: Thu, 9 Jun 2005 14:51:20 -0400
>
>Hello Jim,
>I have built a Zener tester, that will go up to 200v and is good to test
normal diodes for reverse breakdown. I have a PDF of the instructions I used
for inspiration. The idea is there, but I went about it in my own way, with
the parts avail. I can send it out if anyone is interested.
>
>
>
> Thanx,
>
>Scott Beebe
>Ohm Electronics Inc.
>609 W. Clinton St.
>Ithaca NY 14850
>Voice: (607) 273-8406
>Fax: (607) 273-8743
>WWW.OhmElectronicsInc.com
>mailto:Scott@xxxxxxxxxxxxxxxxxxxxx
>
>Thursday, June 9, 2005, 2:15:38 PM, you wrote:
>
>Jim> Look up MTZJ-T-77- in NTE and you'll find a fair selection of various
>Jim> zeners, the first few on the list, up to 10 volts require a test
current
>Jim> of 20ma and the rest require only 9.5ma or less. Maybe a new battery
in
>Jim> your meter WOULD make a difference. In any case if they are used as a
>Jim> protection device on the A/V inputs and are not shorted they are
>Jim> probably not causing any problems.
>
>
>Jim> ********************************
>Jim> Since 1972 *
>Jim> Jim Myers *
>Jim> Telrad Electronics *
>Jim> Fort Wayne Indiana *
>Jim> ********************************
>
>
>Jim> Paul wrote:
>>>Yes, I agree. They appear to be just 1/2w Zeners, although
>>>very small glass cases. I measured a 9.1v, 1w that I had in stock
>>>and it measured fine on both meters. Interesting though, I checked
>>>to see if they would zener and they do 9.4v. They still don't front
>>>to back. How do you figure that? These are in a 2 year old set and
>>>are used in the A/V input circuit apparently as protect.
>>> Paul
>>>
>>>Jerome Silverman <greentron@xxxxxxx> wrote:
>>>Sounds like plain vanilla 9.1 volt zeners. But to answer your question,
some
>>>"zeners" are actually ICs and some have one or more forward biased diodes
in
>>>series with the zener element and some may consist of two or more zener
>>>elements in series.
>>>Jerry Silverman
>>>Greentron Inc
>>>4 Newland Ave Greenville SC 29609
>>>Fax/Phone 864 232 3889
>>>greentron@xxxxxxx
>>>
>>>----- Original Message -----
>>>From: "Paul"
>>>To:
>>>Sent: Wednesday, June 08, 2005 9:44 PM
>>>Subject: [TechAssist] Zener diode test
>>>
>>>
>>>
>>>>Are there zener diodes that cannot be measured? I have 4 Sony zeners P/N
>>>
>>>MTZJ-T-77-9.1B on a board. They do not cross and I am guessing they are
9.1v
>>>zeners. They all are either open or they do not measure. Have lifted one
end
>>>and measured with two different meters,Beckman and a Fluke still no
reading.
>>>Can't believe all 4 are open.
>>>
>>>>Paul
>>>>
>>>>Paul ,B
>>>>Central TV&Video
>>>>911W Grand Ave
>>>>Grover Beach Ca.
>>>>(805)481-8084
>>>>
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>>>
>>>Paul ,B
>>>Central TV&Video
>>>911W Grand Ave
>>>Grover Beach Ca.
>>>(805)481-8084
>>>
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>Jim>
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