Products > Test Equipment

Uni-T launches the UT117C multimeter

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makz:

--- Quote from: geb on September 14, 2023, 04:28:31 pm ---Hmm, how do you know it was used? Reworking a board is normal, especially in early production. Was there other evidence besides the EEPROM?


--- Quote ---I think I've found a calibration constant for DCV.
--- End quote ---

Excellent! Does the change affect all DCV ranges, or just one? And if it affects all DCV ranges, do you notice any change in resistance ranges?

--- End quote ---

DCV all ranges more accurate now. I will compare with pm2525. Resistance range without any changes, im not sure

makz:
old eeprom and new eeprom

geb:
It's been a busy time, but I revisited UT117C briefly.

EEPROM offsets 01 and 02 are an overall DCV calibration value. 01 is the MSB, 02 is the LSB.

I discovered that my unit's DCV range isn't zeroed perfectly. So, as I calibrated DCV by manually updating the value in offset 02 of EEPROM, I checked both +5V and -5V. I updated offset 02 to a level where +5V is shown as three counts too high, and -5V is two counts too low.

Linearity is okay but not perfect when I check 1VDC, 2V, ... up to 6V. The 5V is a bit off and the 6V is off by quite a bit more.

ru_tash:
Hi, nobody mention capacitors measurements, sad surprise for me - the resolution 1nF, so to measure 10000pF will display 9nF ((.
Other than that all ok.

BILLPOD:
Mine reads 0.01uF......go figure.

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