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Uni-T launches the UT117C multimeter

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LeonR:
The backlight on those is a pretty poor (couple LEDs around main LCD). Does yours behave the same?

makz:

--- 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 ---

what error did you end up with in comparison?

geb:
LeonR, agreed, the UT117C's backlight isn't great. I reached for my nearest DMM, an HP-770D, for a side-by-side check. I'd guess the UT117C had about 60-70% of the lumens of the other.

makz, SEL+REL sounds right. As for comparison, I'm not sure what you're asking.

Out of the box, all the DCV and resistance ranges I tested on my UT117C are about six digits off. This is oddly consistent and made me think they copied the EEPROM from another unit without recalibrating :-//.

As for some of my other calibrated meters...

The RM303 is rated for better accuracy (0.05%+-3 in DCV) and is now within a digit or two on multiple DCV and resistance ranges after a brief warmup. It's the best resistance accuracy I've seen in a cheap meter so far. I modded the voltage reference but it was nearly as good before this. (Changed ICL8069D to a handpicked ICL8069A with low drift and added a 4.7uF cap across it per datasheet recommendation. Was hoping to get rid of its wobble, 10.000V is 9.999-10.001 every second or two, but the mod only helped a little. Paralleled caps in a few spots also didn't help. Didn't want to try adding a VLCD supply as another modder did.)

The B41T+ is only accurate to 1-2 digits on a short range of DCV. Its linearity as tested across its 2.2-22V range seems a bit off (several digits IIRC) and some other modes don't have their own calibration (no EEPROM, just a few pots). The B41T+ is a good performing meter otherwise, with a fast-responding analog bar graph and fast auto-ranging.

Incidentally, the bar graph on the UT117C is responsive but "noisy", at least during a quick check of around 5.0VDC.

makz:

--- Quote from: geb on August 24, 2023, 06:39:09 pm ---LeonR, agreed, the UT117C's backlight isn't great. I reached for my nearest DMM, an HP-770D, for a side-by-side check. I'd guess the UT117C had about 60-70% of the lumens of the other.

makz, SEL+REL sounds right. As for comparison, I'm not sure what you're asking.

Out of the box, all the DCV and resistance ranges I tested on my UT117C are about six digits off. This is oddly consistent and made me think they copied the EEPROM from another unit without recalibrating :-//.


--- End quote ---

six digits off - 5.0006 instead of 5V? I understand correctly?

EEVblog:

--- Quote from: CosteC on July 12, 2023, 09:59:24 am ---BT is nice too.
--- End quote ---

I'm disappointed that Brymen didn't release the Bluetooth option in the BM786  :(
It was supposed to be ready for release but it never happened.

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