Uni-T UT804, FI2804MT calibration procedure

[Lajt]

Hi to everyone,

Some time ago I bought a bench multimeter: Française d'Instrumentation FI2804MT
Seems to be re branded Uni-T UT804 inside and out.

I searched all the internet but could not find calibration instructions.
Sent e-mails to: Française d'Instrumentation and Uni-T but they never replied.
I even tried to cal it as UT71E since inside it is almost same as UT71D and Volcraft VC940 but it didn't work.

Does anybody here knows what is the cal procedure for this instrument?

Thank you

[Lajt]

Just for the info if anyone else will need it.

I managed to find a working e-mail address and got a positive response from Uni-t support team.
E-mail can be found on this link at the bottom of the page:

https://www.uni-trend.com.cn/index.php?m=content&c=index&a=lists&catid=18

[uspeakers]

Hi Lajt
I also found my UT804 not calibrated properly.
The link you send takes me to a page displaying chines text.
Can you post the actual calibration procedures please.
Cheers