[TechAssist] Re: Advice needed 3 volt zener leaky????
- From: walter wood <wwood_38478@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 19 Dec 2005 12:58:37 -0800 (PST)
I don't have the RCA part nor do I have a 3volt
zenier, but I have a 5volt and this is my findings.
Fluke model 87III:
on DIODE test.
negative on cathode= 680 which is normal.
Positive on cathode = infinity , normal
On auto ohms setting.
negative on cathode== 2.434 meg
positive on cathode== 7.54 meg.
make sure you don't hold both meter probes in your
hands(the tips). that makes it read less than a meg
both directions.
HTH
Walter
--- J Silverman <greentron@xxxxxxx> wrote:
> Is your meter on ohms or on diode test? How much
> voltage is your meter
> applying to the zener in the reverse direction?
> You might want to apply 12
> volts through a 12K resistor and measuring the
> zener voltage. An ohm meter
> might detect a shorted or very leaky zener but
> the zener voltage could have
> changed and your meter could not detect that.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> Fax/Phone 864 232 3889
> mail to: greentron@xxxxxxx
> ----- Original Message -----
> From: "Eric Manuel" <tvman@xxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, December 19, 2005 11:56 AM
> Subject: [TechAssist] Advice needed 3 volt zener
> leaky????
>
>
> > Hi am I supposed to get reverse leakage on this
> diode I am getting 100 k
> > on it and also 2 more new diodes .On a 10 volt
> zener I dont get any
> > back reading.Is this normal on a 3 volt
> diode.This diode is in a ctc169
> > direct view diode# CR4122--rca#200158.anyone
> have one they can measure
> > the forward and back to check it for me,,Thanks
> Eric
> > --
> >
> >
> > Eric
> > E M Electronics
> > 59 Wights Rd
> > Deer Lake NL
> > Canada
> > A8A 2J2
> > Ph# 709 635 2627
> > tvman@xxxxxxxxxxxxxxx
> >
> >
> >
> >
> >
>
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Walter Wood
United TV Service
501 Poplar St.
P.O. box 602
Pulaski Tn. 38478
mailto:wwood_38478@xxxxxxxxx
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