Products > Test Equipment
Uni-T launches the UT117C multimeter
Electro Fan:
--- Quote from: geb on August 20, 2023, 04:25:51 pm ---Hi! Just joined the forum.
I received my UT117C from Aliexpress a couple of weeks ago. Played with it before leaving for a vacation.
I backed up its 24C02 EEPROM. I tested it against an AD584KH, a pile of 0.01% resistors, a VREF-01, my handmade 1-5-10V reference, and some low-cost reference gadgets (e.g. LB06). When testing voltages, I didn't trust the voltage reference, and instead compared the UT117C's reading to that of my Agilent 34401.
To make a long story short, it seems to be uniformly inaccurate. I mean, voltage ranges are reading roughly 6 digits high and resistance ranges are about 6 digits low.
I want to figure out how to access its calibration menu. Unless someone has already solved that topic and can offer a quick reply, I'll eventually ask that question in a separate thread. I found an unusual menu by holding buttons during power-on but didn't go further.
I've calibrated a small stack of meters using my materials, and been pretty pleased with the result. My ZT-102 is basically perfect (and unlocked to 9999 count using AN8008 EEPROM's limit settings). One of my RM303s is quite good (and its EEPROM stores individual calibrations for each resistance range, unusual for a 12P65-based meter). My Owon B41T+ had the worst rated accuracy but it is a newer revision with a multiturn pot for DC and its DCV is good after a lot of tweaking.
--- End quote ---
Wow
Nice first post :-+ :-+
Welcome to the forum!
Looking forward to seeing your new thread(s).
geb:
Thanks! I'd borrowed an occasional tip from the forums to use in my work up to now. But it was last year, when I found myself single (widowed) and bored, and I idly wondered whether there was anything interesting I should know about my ZT-102. One thing led to another... I've spent about USD1500 at eBay and AliExpress and DigiKey so far. It's been educational, and I'm a bit less bored. :-+
makz:
So, how to calibrate ut117c? :)
geb:
--- Quote ---So, how to calibrate ut117c?
--- End quote ---
That *is* the question. :)
I can't find my note at my workbench about which keypresses launched the hidden menu. And the menu merely shows "0" through "9", which advances by a keypress.
I could swear that I'd reached a sign of success once. I pressed some sequence and reached a DCV range, though I'd started the meter in ACV. Never reproduced that since.
The meter has a separate MCU driving Hycon chips. If it was 100% Hycon chips like the HP-770D I last played with, I'd expect a calibration experience like ZT-102 and RM-303 and so on, because the Hycon MCUs have very little space and their firmware never seems to vary much. But with the separate MCU, anything goes.
makz:
this combianation of sel+rel+ multimeter on. But what this 0 is mean :-//
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