Electronics > Repair
HP/Agilent 6654A Power Supply: swap LCD for VFD/OLED/...
fchk:
I've got a HP 6654A Power Supply, and its LCD is not great at all. No backlight, narrow viewing angles. I've also got an 6632B with VFD, which has excellent readability.
I'm wondering if anybody has already reverse engineered the LCD module and made an OLED or whatever replacement.
coromonadalix:
I dont see any projects .... unless you try to add some led backlight yourself.
project:
https://www.eevblog.com/forum/projects/hp-3457a-lcd-backlight-mod-(also-for-3478a)/
EHT:
I have a 3457A DMM and 66xx series PSUs. It is really annoying that there is no backlight but trying to retrofit one seems like a huge amount of effort which may end up breaking the LCD anyway.
As they have GPIB i think it would be better to add a nice virtual display on the PC instead. In both cases it could emulate the look and feel but also enhance it with data logging. I got basic data collection from the 3457A working in Python although it was a real fiddle with clashes between the NI & Keysight drivers. I haven't tried the 66xx PSUs yet.
I see had a quick look at sigrok. It supports both the 3457A DMM and 6632A PSU. However, i think it didn't have a good UI or support the rear inputs on the 3457A. Does anyone have experience of this or other open source equivalents?
Cheers.
bitseeker:
Here's an HP 3457A (similar type of LCD) that was converted to LED display. There's some talk of other displays as well.
https://www.eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-)/
I concur with EHT that, if you have a GPIB interface and PC in your lab, that's an easier way to go.
coromonadalix:
The https://www.eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-)/
Is a very good project but a very complicated one to achieve if your not equiped with cnc tools etc ... you have to trim the led display casing ...
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