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My 52-0060-2 Mastercraft Digital Multimeter will not record Resistance. I accidentally but the two leads across 120 vac while it was set to the Resistance scale.
When set to 2000k ohm it shows all zeros, 200k it shows 00.7 and strike the two leads together it will show 00.0, 20k it shows 0.71 and strike the two leads will show 0.00, 2000 scale shows 722 and goes to 000 when the two leads touch. 200 scale reads 78.3 and drops to 00.3 when the two leads touch. The diode scale reads 297 and drops to 000 when the two leads touch. All other scales seem to be working OK. Anyone care to diagnose the possible problem this accident may have caused? And why I would be getting these readings on the Resistance scale?
Wrote: 21 May 2015, 08:05 PM Your patience is very much appreciated! Wrote: 15 May 2015, 10:44 PM Hello Ragdoll Queen! Click on 3 workbook otveti onlajn free. In the mean time if you want to continue discussing it via PM, I'll be happy to keep you updated on the situation.
__________________ Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead! Free service manuals: -- 72 LED/LCD TVs, 5 monitors, 28 plasma TVs, and 2 AVR 6.1 amplifiers fixed! -- I repair Pioneer 9G Plasma Main Boards & KRP-M01 Media Receivers (PM me for info) 2 Pioneer KURO 9G, 12 Panasonic LCD/Plasma, 1 Sony LCD, 1 NEC Plasma, 2 Yamaha HTS, 5 Sharp LCDs, 5 Toshiba LCDs, 7 Philips Plasma/LCD, 1 Hitachi Plasma, 11 LG LCD/Plasma, 18 Samsung LED/LCD/Plasma, 1 Thomson Plasma, 1 Atec LCD, 1 Hanspree LCD, 1 Xerox LCD, 1 Harwa LCD, 2 Proview LCD, 2 Hyundai LCD, 1 'Onn' LCD, 1 Grundig LCD, 1 Dell LCD, 1 iiyama LCD, 1 Acer LED, 1 Logik LCD, 1 Baird (China) LCD, 6 Bush LCDs, 22 Vestel LCDs (Best->Worst). My 52-0060-2 Mastercraft Digital Multimeter will not record Resistance. 1) If you want the exact same one, it usually goes on sale for $10 in this kit at Canadian Tire.
2) I have used an earlier version of this Canadian Tire multimeter and it seemed okay. It goes on sale for as low as $19.99 or $14.99 if you are patient. I borrowed the above from a friend so I was obviously not going to see if the ohms range would survive on mains. 3) Better multimeters are designed to survive 'oops' moments and as tom66 mentioned Dave Jones at eevblog regularly does the ohms/mains test in all his reviews.
4) Martin Lorton over at killed his Uni-T 90C trying to measure frequency and turn the rotary dial past ohms while the probes were plugged into 220V AC. Details in this video 5) If you want to spend a bit more, there are a number of other options. __________________ --- begin sig file --- If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like We respectfully ask that you make some time and effort to read some of the.
After you have read through them, then ask clarification questions or report your findings. Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file. From the picture retiredcaps posted, the meter looks like a re-packaged '830' style meter. In which case, yes, it's hardly worth the time.
Anyway, the schematics that I have seen for those type meters show a PTC (thermistor) and a transistor wired as an zener diode (collector/base shorted) is switched in to protect the ohms, continuity and diode-test ranges from over-voltage. Since your meter reads near zero, I would hazard a guess that the transistor has become a near-short. If that's right, simply removing it might restore functionality, although leaving the meter with no protection at all. From the picture retiredcaps posted, the meter looks like a re-packaged '830' style meter. In which case, yes, it's hardly worth the time. Anyway, the schematics that I have seen for those type meters show a PTC (thermistor) and a transistor wired as an zener diode (collector/base shorted) is switched in to protect the ohms, continuity and diode-test ranges from over-voltage. Since your meter reads near zero, I would hazard a guess that the transistor has become a near-short.
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