EEVblog Electronics Community Forum
A Free & Open Forum For Electronics Enthusiasts & Professionals
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email
?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
This topic
This board
Entire forum
Google
Bing
Home
Help
Search
About us
Links
Login
Register
EEVblog Electronics Community Forum
»
Products
»
Test Equipment
»
Fluke PM2525/PM2535 unobtainium LCD alternative
« previous
next »
Print
Search
Pages: [
1
]
Go Down
Author
Topic: Fluke PM2525/PM2535 unobtainium LCD alternative (Read 1870 times)
0 Members and 1 Guest are viewing this topic.
hackwell
Contributor
Posts: 29
Country:
Fluke PM2525/PM2535 unobtainium LCD alternative
«
on:
July 13, 2021, 08:16:40 pm »
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%...
«
Last Edit: July 14, 2021, 05:05:52 pm by hackwell
»
Logged
The following users thanked this post:
edavid
,
coromonadalix
,
yuhar
,
ch_scr
coromonadalix
Super Contributor
Posts: 7012
Country:
Re: Fluke PM2525/PM2535 unobtainium LCD alternative
«
Reply #1 on:
July 13, 2021, 11:05:13 pm »
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 ??
Logged
bob91343
Super Contributor
Posts: 2675
Country:
Re: Fluke PM2525/PM2535 unobtainium LCD alternative
«
Reply #2 on:
July 14, 2021, 01:33:21 am »
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.
Logged
hackwell
Contributor
Posts: 29
Country:
Re: Fluke PM2525/PM2535 unobtainium LCD alternative
«
Reply #3 on:
July 14, 2021, 04:15:37 pm »
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...
Logged
tooki
Super Contributor
Posts: 13157
Country:
Re: Fluke PM2525/PM2535 unobtainium LCD alternative
«
Reply #4 on:
July 14, 2021, 04:47:54 pm »
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.
Logged
hackwell
Contributor
Posts: 29
Country:
Re: Fluke PM2525/PM2535 unobtainium LCD alternative
«
Reply #5 on:
July 14, 2021, 05:14:08 pm »
Done
I wonder why it didn't work eysterday... I need to include them on github as well
Logged
The following users thanked this post:
tooki
,
TIG
TIG
Newbie
Posts: 5
Country:
Re: Fluke PM2525/PM2535 unobtainium LCD alternative
«
Reply #6 on:
January 27, 2024, 01:02:52 pm »
This post saved my Philips PM2535, see my post at
https://www.eevblog.com/forum/repair/unobtainium-philips-pm2525-pm2534-and-pm2535-lcd-replacement/
. Many thanks!
Logged
Print
Search
Pages: [
1
]
Go Up
« previous
next »
Share me
Smf
EEVblog Electronics Community Forum
»
Products
»
Test Equipment
»
Fluke PM2525/PM2535 unobtainium LCD alternative
There was an error while thanking
Thanking...
EEVblog Main Site
EEVblog on Youtube
EEVblog on Twitter
EEVblog on Facebook
EEVblog on Odysee