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UNI-T UT61E Multimeter teardown photos.

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Dareksa:
You are right that the FTDI can be less problematic than other chips, but this Prolific converter works for me with each of my equipment.
Does not matter if I have to configure cisco switch, LPG in the car or connect UT61E to PC.

uski:
Not sure if this has been posted already :


Of course you don't have to work with 2500V to encounter such transient voltages.
Measuring the voltage across a relay coil might be enough if there is no free-wheel diode.
It can also happen with AC circuits if there is a motor, or in a car sometimes.

Any idea as to suitable MOVs or spark-gaps for a UT61E ?
Something that will allow 400VAC measurement safely but trigger at, say, 1000VAC ?

SeanB:
I added 2 275VAC VDR's in series in the 2 places on the PCB in mine. Works well enough to measure 250VAC, but will now clamp at 793V for overload. Just went and tested now with a high voltage source that goes to 1400V. The VDR's were the 5mm type from RS. I needed one, but the SSM is 5, so there were 4 spare and they were placed in the UT61E.

Bought both the UT61E and the Dy294 green lunchbox transistor/capacitor tester from Frankie ( Iloveelectronics).

Wytnucls:
I haven't seen the Max Min modification done on the UT61E anywhere yet. So here it is:

Bridging pin 100 and 98 on the Cyrustek IC will disable the REL mode and enable the Max/Min mode, which I find more useful.
Be careful with the soldering, as the pins are very close to each other. It isn't necessary to cut any traces and the mod is reversible at any time.
Max Min works with most meter selections.

lagman:
I'm trying to measure the frequency and duty cycle of a flashlight which uses PWM to control light intensity.
I set my DMM using the 10A slot  on the A range:

And put the meter in series (like I would do to measure the amp draw).
I get no readings either for duty cycle or frequency.
Am I doing something wrong? Thanks.

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