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Replacing OLED screen on an Agilent U1253A Multimeter

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gamalot:

--- Quote from: --Oz-- on December 08, 2022, 07:21:15 am ---@gamalot, you can double your battery run time by using a 650~750mAh li-ion 2S 9v battery.
And could do more capacity with pouch lii-on cells.

--- End quote ---

Yes, choosing a battery with a higher capacity is a solution, but the high power consumption design of the original display and some replacements is still unsatisfactory to me, and no matter what kind of battery being used, a display with low power consumption is always a better choice.

--Oz--:
The larger capacity battery is the lowest hanging fruit. So the original display board had 12v, 9v and 3.3v. I think all of these could be looked at for improved efficiency. The 3.3v is a linear reg is a no brainier to switch to a skip mode buck regulator. Regarding the boost regulator(s), a larger lower esr inductor will help a little, playing with switching freq can also help. You might want to try lowering the 12v and 9v outputs to shave some mA, same with 3.3v. Maybe an option to dim the backlight even more for low light applications. Is there settings in the driver to reduce power, like lower hz update rate/etc?
Milling out the case for a larger li-ion battery would be many fold more run time than all these small incremental improvements, but some would look down on that. 🤣

TheSteve:
Custom boot logo is pretty nice.

I admit in my mind a patch to the original firmware would be the best overall solution.

--Oz--:
Yes of course, but what's the chance that is going to happen? About the same as your daughter cleaning her room.

TheSteve:

--- Quote from: --Oz-- on December 09, 2022, 09:15:24 pm ---Yes of course, but what's the chance that is going to happen? About the same as your daughter cleaning her room.

--- End quote ---

Well I certainly wasn't suggesting Keysight would do it. Firmware for many devices have been patched by creative owners. This seems pretty "do-able", just takes one inspired person(and sadly maybe a few bricked meters).

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