[TechAssist] Re: Diode testing
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 27 Aug 2004 12:35:26 -0400
Yes, sounds normal to me. On my Fluke 77, the display reads something
like: .121 on a Schottky diode and .560 on a regular diode. BTW, these
readings are indicative of forward voltage drop across the junction. ON
LEDs, you get readings of approx. 1.45 for a red LED and 1.7 for green,
0.987 for infrared etc.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Kevin wrote:
> Could these 2 diodes be Schottky ones? With my Fluke 12 on diode
> setting, Schottky diodes measure very low resistance one way, and the
> other way the meter just blinks '0' and open.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Paul
> Sent: Thursday, August 26, 2004 7:11 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Diode testing
>
> When checking diodes for leakage, what range on the ohm meter do you use
> and is there an acceptable amount? Sounds like electronics 101 but I
> have a couple of diodes that are flat case diodes mounted on a heat
> sink. They read 160 front to back on the diode check. No reading back
> to front. However they read 20k on the ohms scale. If heated this
> reading goes down to 2 or 3 K. I normally set my meter on 100k ohm for
> leakage. I thought they must be leaking. But wondered if there are some
> big diodes that test this way normally? Someone said that 10X the back
> to front was normal. These are in the secondary of a SMPS + & -- 25v to
> convergence amps.
>
> Paul
>
> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
>
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