Uni-T UT181A and calibration

[JulienS]

I think I have found a door but we need the key ...
Keeping pressed F2 and F3 pres On/Off button.
And the screen with a 5 zeros appear . This can be modified with arrows to form a code . 00000 as to CEM is not working ...
I will search for key used in other uni-t dmms .

Hi everyone, better late than never ! the key code is 02089.

[joeqsmith]

I predict an increase in posts about how the UT181A is not accurate. 

[Bobson]

UT-171B to enter CAL mode turn on while pressing RANGE+STORE. Password is the same, 02089.
However, unlike UT-181A where you just type in proper values, UT-171B shows some CHANGING value at secondary readout, and it is unclear how to change primary value.

[stj]

lets apply some logic.

the meter is new.
it was probably calibrated on an automated system before being packed.
it has travelled a long way.

i would open it and look for bad soldering or other physical issues.

[Bobson]

lets apply some logic.

the meter is new.
it was probably calibrated on an automated system before being packed.
it has travelled a long way.

i would open it and look for bad soldering or other physical issues.

How does it correspond to the adjustment protocol?

[stj]

it doesnt have anything to do with ajustment protocol.
why would you mess up the calibration if it may just be a cracked solder joint?
changing the factory calibration should be the very last option, not the first!