Products > Test Equipment
Uni-T launches the UT117C multimeter
EEVblog:
Inside
EEVblog:
--- Quote from: sonpul on August 25, 2023, 11:01:30 am ---Nobody confirmed 0.3%. I insist that this is a mistake in the description and many have already confirmed that the characteristics on paper have deteriorated by more than 10 times. Maybe in order not to spoil the sales of UT61E+.
--- End quote ---
It's not a mistake, the accuracy spec is primarily determiend by the voltage reference used.
This a 60,000 count meter with 6,000 count meter reference.
The fact that it's calibrated to be way better than 0.3% is not the point, the reference will be a cheapie. Will probably vary a lot with temp.
sonpul:
Maybe. But UT117C is built on the basis of HY3131 which is 50000 counts. I saw the same in table Owon for 55000. On the same is made UEI EEvblog UE121GV. Is he 6000? And declared for 50000.
As for thermostability. My BM789 for how much I know, not the best thermostability.
iMo:
The resolution of the chip used is one thing, the reality the other. I own 2 meters, one is based on LD120+LD121 which is 20000 (aprox 40y old), and the other one is based on MAX134 which is 40000 (30y old). The reality is the first one is implemented as 2000 and the second one as 4000 max resolution. It seems the designers decided to show a stable reading instead of more digits with noisy last digit. And the reference used is pretty important indication as well - for 60000 (almost 16bit) you would need something like LM399 to make the meter happy..
geb:
--- Quote ---UT117C is built on the basis of HY3131 which is 50000 counts
--- End quote ---
What iMo said. :)
A lot of popular lower-end meters for a few years have been 6000, 9999, 19999 counts, all seemingly based on HY12P65 single-chip solution which is officially 5000 counts but has a 19-bit ADC. It's possible to get more out of the chips. It's more a question of the limits/quality of the ADC, voltage reference, ...
I think UT117C shows promise for my day-to-day use. It's more responsive, the LCD contrast is better, and its readings are more stable, than my RM303 and HP-770D. It sounds like it has better handling of resistance ranges than HP-770D as well. EEVBlog's point about the lack of current ranges is valid but I usually need to casually check 1-500ma and I have other meters for uA. And I see more protection on its board than in a ZT-102 :) so I'm a little more comfortable reaching for it to test mains voltage. I'd like to see a formal review covering its protection.
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