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UNI-T UT61E Multimeter teardown photos.

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sdttn:
I just cut hold button trace.

Lightages:
If you just cut the hold button trace and leave it disconnected, you loose the valuable feature of the delay hold. When you press the hold button for a few seconds the meter goes into a timed hold mode. During this time you can connect to the voltage you want to measure and then wait for the beep. At that time the meter will hold the value and you get almost the same benefit as an auto-hold like some Flukes have

dr_p:

Also if you do the "photodiode-to-auto-power-off-from-RS232-handshake" hack you also lose the ability to wake up the meter from auto power off. It automatically wakes up in display HOLD, so you have to press the hold button to cancel that. If you switch ranges it goes to delay HOLD, so you'll have to turn it off, then on again via the rotary switch.


But you can maybe add a MCU and implement a dual function for the HOLD button: single press = backlight command, long press = delay HOLD. You lose the simple instant-display HOLD function, but that's useless anyway IMHO.


The auto-power off hack is the best bang for your buck, so to speak, because you lose no functionality of the meter. Only when you connect RS232 adapter, the meter disables serial communication and enables 15min auto power off.

Lightages:
If Uni-T had not been cheap on the input protection, had configured the data cable for the auto power off switching, and supplied a USB cable instead, they could be sold for $75 and they would still sell like crazy. The backlight would be quite a bit more work to rework the design.

T4P:
They already sell like hotcakes ... and no i don't mind the 50$ bracket. I rather they stayed there

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