UNI-T UT61C
 | |
| Status | supported |
|---|---|
| Source code | uni-t-dmm |
| Counts | 6000 |
| IEC 61010-1 | CAT II (600V) / CAT III (300V) |
| Connectivity | RS232 / USB |
| Measurements | voltage, current, resistance, capacitance, frequency, duty cycle, diode, continuity, temperature |
| Features | autorange, data hold, min/max, rel, bargraph, backlight |
| Website | uni-trend.com |
The UNI-T UT61C is a 6000 counts, CAT II (600V) / CAT III (300V) handheld digital multimeter with RS232 or USB connectivity.
See UNI-T UT61C/Info for more details (such as lsusb -v output) about the device.
Hardware
Multimeter:
- Multimeter IC: Fortune Semiconductor FS9922-DMM4 (datasheet)
- Crystal: 4MHz (markings: "3.999")
- Fuses: 10A/240V and 1A/240V (HRV fuses)
RS232 cable:
See Device cables#UNI-T_UT-D02.
USB cable:
See Device cables#UNI-T_UT-D04.
Photos
Multimeter:
RS232 cable:
See Device cables#UNI-T_UT-D02.
USB cable:
See Device cables#UNI-T_UT-D04.
Usage
The DMM does not transmit samples after power up. You need to long-press the REL Δ button to activate the remote measurement. This also deactivates the auto power-off function of the device.
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-ut61c: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-ut61c-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-ut61c-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.
Protocol
See Multimeter_ICs#Fortune_Semiconductor_FS9922-DMM4 for the DMM IC protocol. Depending on the cable, additional transport-specific decoding is needed, though.