UNI-T UT61E
 | |
| Status | supported |
|---|---|
| Counts | 22,000 |
| IEC 61010-1 | CAT II (600 V) / CAT III (300 V) |
| Connectivity | RS232 / USB |
| Measurements | voltage, current, resistance, capacitance, frequency, duty cycle, diode, continuity |
| Features | autorange, true-rms, data hold, min/max, relative, bargraph, backlight |
| Website | uni-trend.com |
The UNI-T UT61E is a 22,000 counts, CAT II (600 V) / CAT III (300 V) handheld digital multimeter with RS-232 or USB connectivity.
See UNI-T UT61E/Info for more details (such as lsusb -vvv output) about the device.
The more recent UT61+/UT161 series is different from the previous UT61 series, and is not supported, until their protocol is known and a driver for them becomes available.
Hardware
- Cyrustek ES51922 multimeter chip (ES51922A actually, as per various photos: 1, 2, 3, 4)
Photos
Older version:
Newer version:
Protocol
See Cyrustek ES51922 for the DMM IC protocol.
Depending on the cable, additional decoding is needed, though.
Different cables are available to communicate to the DMM: regular serial cables which provide a COM port, and USB HID based cables where applications are required to handle a proprietary protocol of running serial communication on top of HID requests. See the Device cables page for details; the same cables can be used with many different DMM models.
Depending on the specific cable in use, either a device driver ending in -ser or not ending in -ser must be used. See README.devices for details.
The message "HID feature report error: LIBUSB_ERROR_PIPE" results from using the USB HID driver with a USB-to-serial cable. In this case, try using --driver=uni-t-ut61e-ser
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]
Usage
The following sigrok-cli command can be used to receive five measured values from a device connected via USB (note that the USB VID/PID after the conn option needs to be changed depending on the exact USB adapter cable used):
$ sigrok-cli --driver=uni-t-ut61e:conn=1a86.e008 -O analog --samples 5
If your meter has a serial (RS-232) cable connected to a USB-to-serial adapter, a different driver is used. Example for ttyUSB0:
$ sigrok-cli --driver=uni-t-ut61e-ser:conn=/dev/ttyUSB0 -O analog --samples 5
Same example for COM1 (Windows), please note the special syntax for specifying the COM port:
C:\> sigrok-cli --driver=uni-t-ut61e-ser:conn=\\.\COM1 -O analog --samples 5
--samples <n> stops acquisition after the specified number of measurements, while --continuous does not stop. Type just sigrok-cli by itself for a summary of options. More information on drivers can be found in the README.devices file of the libsigrok source tree.
Resources
- Manual
- Vendor software
- 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)
- Multimeter data parsing utility complete implementation written in Python
- 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