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Science Forum Index » Electronics - Basics Forum » diode, rectifier dead?...
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 Posted: Fri May 23, 2008 7:36 am |
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Can anyone confirm whether following microwave oven components are
dead
-diode hvr1x8019:tested with analog ohm meter-short both directions
-rectifier 2x062h 8025:..open in both directions
tnx |
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| mike... |
| Posted: Fri May 23, 2008 2:33 pm |
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anglomont at (no spam) yahoo.com wrote:
Quote: Can anyone confirm whether following microwave oven components are
dead
-diode hvr1x8019:tested with analog ohm meter-short both directions
probably
-rectifier 2x062h 8025:..open in both directions
What's the forward voltage spec of the diode?
What's the highest voltage your meter can supply?
if second is lower than the first it will look open.
--
Return address is VALID!
Bunch-O-Stuff Forsale Here:
http://mike.liveline.de/sale.html |
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| James Sweet... |
| Posted: Fri May 23, 2008 2:38 pm |
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mike wrote:
Quote: anglomont at (no spam) yahoo.com wrote:
Can anyone confirm whether following microwave oven components are
dead
-diode hvr1x8019:tested with analog ohm meter-short both directions
probably
-rectifier 2x062h 8025:..open in both directions
What's the forward voltage spec of the diode?
What's the highest voltage your meter can supply?
if second is lower than the first it will look open.
tnx
If the diode tests shorted in both directions it's bad. The one that
tests open is probably good, those have a high breakdown voltage, the
ohm meter can't exceed that. |
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| DaveM... |
| Posted: Fri May 23, 2008 3:45 pm |
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<anglomont at (no spam) yahoo.com> wrote in message
news:e9ede4c8-a93c-4d40-8a59-7ecb7bb3b571 at (no spam) f36g2000hsa.googlegroups.com...
Quote: Can anyone confirm whether following microwave oven components are
dead
-diode hvr1x8019:tested with analog ohm meter-short both directions
-rectifier 2x062h 8025:..open in both directions
tnx
The diode that reads short in both directions is definitely bad. The other, if
it's a high voltage rectifier, might have too high Vf to be properly tested by a
multimeter. Those are best tested by a Huntron Tracker or by replacement.
--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)
Experience: What you get when you don't get what you want |
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| James Sweet... |
| Posted: Fri May 23, 2008 4:31 pm |
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Guest
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DaveM wrote:
Quote: anglomont at (no spam) yahoo.com> wrote in message
news:e9ede4c8-a93c-4d40-8a59-7ecb7bb3b571 at (no spam) f36g2000hsa.googlegroups.com...
Can anyone confirm whether following microwave oven components are
dead
-diode hvr1x8019:tested with analog ohm meter-short both directions
-rectifier 2x062h 8025:..open in both directions
tnx
The diode that reads short in both directions is definitely bad. The other, if
it's a high voltage rectifier, might have too high Vf to be properly tested by a
multimeter. Those are best tested by a Huntron Tracker or by replacement.
Or test them by applying mains voltage through one to a low wattage
incandescent bulb. If the diode is working, the bulb will be dim and
flicker slightly running on half wave power. |
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| Phil Allison... |
| Posted: Fri May 23, 2008 10:28 pm |
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<anglomont at (no spam) yahoo.com>
Quote: Can anyone confirm whether following microwave oven components are
dead
-diode hvr1x8019:tested with analog ohm meter-short both directions
** Dead for sure.
Quote: -rectifier 2x062h 8025:..open in both directions
** Probably OK.
Testing such high voltage diodes ( really a multi-diode stack ) requires a
source of voltage more than what a DMM or analogue ohm meter has available.
Try connecting a 9 volt radio battery in both directions, while monitoring
current flow with your meter.
...... Phil |
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| Paul E. Schoen... |
| Posted: Fri May 23, 2008 11:18 pm |
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"Phil Allison" <philallison at (no spam) tpg.com.au> wrote in message
news:69pgblF346q3vU1 at (no spam) mid.individual.net...
Quote:
anglomont at (no spam) yahoo.com
Can anyone confirm whether following microwave oven components are
dead
-diode hvr1x8019:tested with analog ohm meter-short both directions
** Dead for sure.
-rectifier 2x062h 8025:..open in both directions
** Probably OK.
Testing such high voltage diodes ( really a multi-diode stack ) requires
a source of voltage more than what a DMM or analogue ohm meter has
available.
Try connecting a 9 volt radio battery in both directions, while
monitoring current flow with your meter.
With some sort of current limiter, like a light bulb, of course.
Paul |
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| Phil Allison... |
| Posted: Fri May 23, 2008 11:37 pm |
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Guest
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"Paul E. Schoen Smug Pig "
Quote:
** Dead for sure.
-rectifier 2x062h 8025:..open in both directions
** Probably OK.
Testing such high voltage diodes ( really a multi-diode stack ) requires
a source of voltage more than what a DMM or analogue ohm meter has
available.
Try connecting a 9 volt radio battery in both directions, while
monitoring current flow with your meter.
With some sort of current limiter, like a light bulb, of course.
** Not essential.
A standard 9 volt radio battery will only deliver about 200mA into a diode
stack that conducts at 6 to 10 volts - plus a test takes only a few
seconds.
Best avoid alkaline types for this, unless it is near flat.
...... Phil |
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| Smitty Two... |
| Posted: Mon May 26, 2008 9:31 am |
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In article <n8udnegY_ZBzMafVnZ2dnUVZ_j-dnZ2d at (no spam) comcast.com>,
"William Sommerwerck" <grizzledgeezer at (no spam) comcast.net> wrote:
Quote: Some DMM user manuals suggest that you briefly
short the diode while the test leads are attached.
Must be only prehistoric ones -- I bet.
If the Fluke 87 is prehistoric, you lose.
Bzzzt. If the Fluke 87 is prehistoric, he wins. |
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