I've "stolen" a DMM Check yesterday from my colleague and decided to check the accuracy of my multimeters. I have two UT71C meters which I rarely use and one UT60E that I use most of the time. Only one UT71C was tested. Surprisingly enough, accuracy was better than expected for the lower priced UT60E while the UT71C was...well...a bit on the edge of its specs for some measurements. All measurements were taken at room temperature (approx. 21C/70F), 30 minutes after being powered on.
Spec sheet for the DMMCheck Plus:
First up, the
UT60E, 4000 count TrueRMS multimeter. Scratches on the screen are actually on the protective foil. Yes, it's still there, after 5 years of use. Haven't really noticed it until yesterday while taking pictures
AC/DC voltage measurement: within specifications. AC/DC current measurement: unbelievably spot on! Frequency and duty cycle: within specifications. Resistance measurement: again, spot on!
Next up is the better spec'd
UT71C, a 40000 count TrueRMS multimeter with data logging, min/max, reative measurements, blah blah... I have to mention that the current measurements fluctuated a bit whenever the backlight was turned on. Most likely the LEDs take a lot of current and that affects the reference. It's probably a good time to replace the battery.
AC/DC voltage measurement: within specifications. AC/DC current measurement: AC failed, DC passed (barely). Frequency and duty cycle: within specifications. Resistance measurement: almost spot on. All images are linked from my web site so in case you don't see them, you can check the blog posts here:
UNI-T UT60E Accuracy CheckUNI-T UT71C Accuracy CheckI hope this will help some of you who are thinking of buying one of these meters. I know that the UT61E is popular around here, but his older brother UT60E is also very very good. Next up is the Fluke 287.