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| Fluke PM2525/PM2535 unobtainium LCD alternative |
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| hackwell:
Hi everyone, I recently had the bargain to get two Fluke / Philips PM2525 bench mutilemeters off Ebay. For parts or repair that is. I managed to fix both of them after a LM393 and two BRY39 replacement. But I was left with one issue : a leaky LCD. These custom things are unobtainium of course , so I tried to figure out a way to get around this. there are few attemps to do exactly that : https://www.eevblog.com/forum/repair/philips-pm2525-alternative-lcd-display/ and https://www.maximintegrated.com/en/design/technical-documents/app-notes/6/6315.html. As I spend way too much time on aliexprees I found this : https://fr.aliexpress.com/item/32953790969.html?spm=a2g0s.9042311.0.0.69c66c37qZekH4 This one is perfect for the purpose (a little too small though) but guess what ? it does the job ! have look at my github for code and details : https://github.com/AKerambrun/PM2525-OLED-display Now my meter is fully functionnal except the displayed 'NC' which means not calibrated. bugger! if anyone knows how to generate 1000Vdc and 600Vac +- 0.05%... |O |
| coromonadalix:
maybe using a signal generator with a signal transformer, something with 32 ohms of more impedance and boosting you signal level that way and add a resistor load like 20k ohms or more to slightly loads it without consuming too much at the primary ?? |
| bob91343:
Generating the voltage is no big deal. But having it at .05% is another story. Unless you need that range calibrated for your use, perhaps you can make the processor think you calibrated it. |
| hackwell:
Yep you're right. I don't need this level of accuracy anyways. The voltage has to be within certain limits for the processor to accept the calibration though. Once I put th DMM toghether I'll give it a try and post the results. It seems that if only one range is not calibrated the uncal message is still displayed in all ranges leaving only 5 digits readings which is pretty annoying... |
| tooki:
That’s great work — please copy the images to attachments here on the forum so they won’t go missing in a few years when the image host goes out of business, or decides to charge money, or deletes your account or whatever. |
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