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
diode, rectifier dead?
Started by ●May 23, 2008
Reply by ●May 23, 20082008-05-23
anglomont@yahoo.com wrote:> Can anyone confirm whether following microwave oven components are > dead > -diode hvr1x8019:tested with analog ohm meter-short both directionsprobably> -rectifier 2x062h 8025:..open in both directionsWhat'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-- Return address is VALID! Bunch-O-Stuff Forsale Here: http://mike.liveline.de/sale.html
Reply by ●May 23, 20082008-05-23
mike wrote:> anglomont@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.
Reply by ●May 23, 20082008-05-23
<anglomont@yahoo.com> wrote in message news:e9ede4c8-a93c-4d40-8a59-7ecb7bb3b571@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 > tnxThe 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
Reply by ●May 23, 20082008-05-23
DaveM wrote:> <anglomont@yahoo.com> wrote in message > news:e9ede4c8-a93c-4d40-8a59-7ecb7bb3b571@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.
Reply by ●May 24, 20082008-05-24
<anglomont@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. ..... Phil
Reply by ●May 24, 20082008-05-24
"Phil Allison" <philallison@tpg.com.au> wrote in message news:69pgblF346q3vU1@mid.individual.net...> > <anglomont@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
Reply by ●May 24, 20082008-05-24
"Paul E. Schoen Smug Pig "> >> >> ** 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
Reply by ●May 26, 20082008-05-26
Some DMM user manuals suggest that you briefly short the diode while the test leads are attached. This forces the meter to downrange and give a less-inaccurate reading of the forward resistance when the short is removed.
Reply by ●May 26, 20082008-05-26
"William Sommerwanker"> Some DMM user manuals suggest that you briefly short the diode while the > test leads are attached.** Must be only prehistoric ones - I bet.>This forces the meter to downrange and give a > less-inaccurate reading of the forward resistance when the short is > removed.** Neither manual nor auto-ranging DMMs have enough volts available on the ohms ranges to forward bias a single silicon diode - let alone a series string of them, as found in microwave oven diodes. Most DMMs have " diode test " ranges fitted, which will supply up to a couple of volts with a fixed current of about 1 mA. The reading is then in volts or millivolts. ...... Phil