UNI-T UT61E

The UNI-T UT61E is a 22000 counts, CAT II (600V) / CAT III (300V) handheld digital multimeter with RS232 or USB connectivity.

See UNI-T UT61E/Info for more details (such as lsusb -vvv output) about the device.

Hardware

• Cyrustek ES51922 multimeter chip (ES51922A actually, as per various photos: 1, 2, 3, 4)

Photos

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Protocol

TODO.

The transmission of the measurement data cannot be disabled, the respective Cyrustek ES51922 pin (111, RS232) is tied to GND (i.e. transmission is always enabled) on this multimeter.^[1]

Resources

• Henrik Haftmann: DMM.exe etc. (Windows software for various UNI-T DMMs, and lots of device/protocol info)
• Henrik Haftmann: Hoitek HE2325U info
• Henrik Haftmann: UT61E log and protocol docs
• diyftw.de: Uni-Trend UT61E (UT-D04 linux treiber) (device info, Linux software using HIDAPI: ut61e-linux-sw-0.02.tar.gz)
• Steffen Vogel: UNI-TREND UT61E Digital Multimeter (device info, Linux software for serial port: dmmut61e-0.01.tar.gz)
• Steffen Vogel: Inner workings of UNI-TREND UT61E Digital Multimeter (teardown)
• erste.de: UT61 - USB Multimeter unter Linux auslesen (info on the Hoitek HE2325U (clone?) and how suspend/resume fixes some issues with it)
• easyelectronics.ru: Refinement of a file multimeter UT61E
• flodins.info: Multimeter UNI-T UT61E
• UNI-T UT61E schematics: ut61e sch.pdf
• Teardowns: 1, 2, 3, 4, 5, 6