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UNI-T UT61E Multimeter teardown photos.

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dr_p:
mine always initialises in 0.0000V (5 digits)

hgg:
Strange. 
After initialization does it stay with 5 digits?

mariush:
Same here, shows all 5 digits.

There are a couple or so undocumented features but they're documented in the IC datasheet (the IC used by the multimeter).

See the datasheet, from 3.1 forward, all kinds of things you can do in combination with the HOLD button : http://www.cyrustek.com.tw/spec/ES51922.pdf   

Plus there's a mention a few pages before saying if you keep hold pressed for 2 seconds while switching the meter on will keep all lcd segments lit until you hit hold again.



Rick Law:
Mine switch on to 0.0000 Volt  (5 digits).  With test leads touching, it shows and stay 0.0000V.  When the leads are not touching, it will show random milli-volts as I move my body around which I assume to be it picking up static electricity and my body's field.

I am guessing: I suspect if it picks up the random static electricity over 2.2V it would go to and the range over 2.2V volt which would be 4 digits.

The biggest random volts I've seen is 0.1v (100mV) range, no where near switching to > 2.2V, but I can see it could happen if you are wearing wool and on carpeting.  I am not even sure if it will stay on that range after just a brief shot over 2.2V.

Rick

EDIT/Update:
I tried to reproduce a higher random voltage caused by static electricity on start up.  I used a 9v battery brushing by the test leads as it was powering up.  It went into the over 2.2v range reducing it to 4 digits (9.xxxx) for a brief moment.  But it settles back down to below 2.2V range displaying 0.0000 (5 digits).  So, at least for my version of firmware, my guess of brief static electricity causing it to change range is not on target.  Even if that happened, it came back down on its own.

try:
Hi sdttn!

How did you suppress the original "Hold"-function?
Did you connect the the "Hold"-Pin to the "Range"-Pin?

How much current do you draw from BKOUT?
How do you know if this is just a logical output or an output that allows some current flowing?
I don't find any answer in the specsheet from Cyrustek.

Regards
try


--- Quote from: sdttn on May 11, 2011, 10:00:26 pm ---Thanks for your reply.

By the way the DMM has not backlight function.
But the chip (ES51922) supports backlight function. The HOLD button is useless for me so I decided to use this button as backlight ON/OFF button.








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