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28 Nov 2019 06:19:18 UTC
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EEVblog #712 - Uni-T UT71E Multimeter (Why Uni-T Meters Suck)
Dave shows why Uni-T multimeters generally suck in this teardown (and a little bit of a review) of the $180 UT71E 0.025% accuracy multimeter with power measurement capability.
He also opens the UT71A, UT61E, and compares the input protection and rating with a Brymen BM257.
http://uni-trend.com/UT71E.html
MAX6190 Voltage Reference: http://datasheets.maximintegrated.com/en/ds/MAX6190-MAX6198.pdf
OP1177 Opamp: http://www.analog.com/static/imported-files/data_sheets/OP1177_2177_4177.pdf
Cyrustek ES51922 DMM chipset: http://www.cyrustek.com.tw/spec/ES51922.pdf
Holtek HT1621 LCD driver: http://www.ywslcm.com/Upload/tbDownload/2013-4-13_9_37_49.pdf
AD636 True RMS Converter chip: http://www.analog.com/static/imported-files/data_sheets/AD636.pdf
...
https://www.youtube.com/watch?v=i2Tkm21dI1g
He also opens the UT71A, UT61E, and compares the input protection and rating with a Brymen BM257.
http://uni-trend.com/UT71E.html
MAX6190 Voltage Reference: http://datasheets.maximintegrated.com/en/ds/MAX6190-MAX6198.pdf
OP1177 Opamp: http://www.analog.com/static/imported-files/data_sheets/OP1177_2177_4177.pdf
Cyrustek ES51922 DMM chipset: http://www.cyrustek.com.tw/spec/ES51922.pdf
Holtek HT1621 LCD driver: http://www.ywslcm.com/Upload/tbDownload/2013-4-13_9_37_49.pdf
AD636 True RMS Converter chip: http://www.analog.com/static/imported-files/data_sheets/AD636.pdf
...
https://www.youtube.com/watch?v=i2Tkm21dI1g
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