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QtDMM

QtDMM is a simple, cross-platform digital multimeter (DMM) readout application with a built-in, configurable transient recorder. It's especially useful for users of older multimeters whose original software no longer runs on modern operating systems.

QtDMM provides a reliable, open-source alternative to outdated or proprietary DMM software and runs on current Linux, Windows, macOS and FreeBSD systems.

Website with downloads and the online handbook: https://qtdmm.de, contact: hello@qtdmm.de. Source code and bug reports: https://github.com/tuxmaster/QtDMM.

Features

  • Transient Recorder
    • Manual start
    • Scheduled start at a specific time
    • Automatic start triggered when defined thresholds are reached
  • Analog meter display with auto-ranging scale, dockable or as its own window
  • Several meters at once, one window each, recording in sync
  • Calculated values across meters (power from voltage and current, ...)
  • Virtual meter (sine, square, noise, discharge curve, ...) for demos and testing
  • various connection backends
    • RS232 Serial (USB-Serial and native UART)
    • USB HID-serial support (HOITEK HE2325U & compatible)
    • RFC2217 remote serial, with qtdmm-bridge to serve meters from a Raspberry Pi
    • Sigrok support via sigrok-cli application
  • supports lots of DMMs, see Supported devices
    • custom serial settings dialog for yet unknown DMMs

Key Advantages

  • Supports many RS232-based/USB-based multimeters
  • Recording via network remote with RFC2217 remote serial support
  • Runs several meters side by side and combines them (power from U and I)
  • No proprietary software required
  • Fully open source and GPL-V3 licensed
  • Easy to use and extend

Documentation

  • User Guide — connecting a meter, the recorder, CSV export, troubleshooting, keyboard shortcuts. The same pages are built into QtDMM as its handbook (F1).
  • Protocols — the wire protocols of the supported meters: which decoder handles which device, the original protocol notes and captures, and the test vectors derived from them.
  • Development — building, testing, and extending QtDMM, including how to add support for a new meter; the Doxygen API documentation is at https://qtdmm.de/api/.

This site is published at https://qtdmm.de/docs/. Build it locally with pip install mkdocs and mkdocs serve from the repository root.

Supported hardware

Every meter QtDMM can decode, taken from the decoder registrations in src/decoders/ (this page is generated from them by tests/generate_docs.py). Choosing one of these models on the Multimeter settings page fills in the serial parameters below; meters not listed can often be used with Manual settings if they speak one of the listed protocols - the Chip column helps: a meter built around the same chip (named in its manual or on the sigrok wiki) usually speaks the same protocol. See Connecting a meter.

Serial is baud rate, data bits, parity (N/E/O) and stop bits. Lines are the control lines the cable needs driven. Counts is the display resolution. Not every entry has been confirmed on hardware recently; models marked ¹ were added from chip data (libsigrok, ultradmm.com) and have not been tried with QtDMM at all. If you can confirm one, or get an unlisted meter working, please report it on the project page.

Vendor Model Chip Protocol Serial Lines Counts
APPA 71 ¹ ES51986 CyrustekES51986 19200 7O1 DTR 6000
APPA 73 ¹ ES51986 CyrustekES51986 19200 7O1 DTR 6000
Brymen BM250 ¹ Brymen BM25x BrymenBM25x 9600 8N1 DTR RTS 6000
Brymen BM251 ¹ Brymen BM25x BrymenBM25x 9600 8N1 DTR RTS 6000
Brymen BM252 ¹ Brymen BM25x BrymenBM25x 9600 8N1 DTR RTS 6000
Brymen BM257 ¹ Brymen BM25x BrymenBM25x 9600 8N1 DTR RTS 6000
Brymen BM525s ¹ Brymen BM52x (BU-86X) BrymenBM52x 0 8N1 - 6000
Brymen BM829s ¹ Brymen BM82x (BU-86X) BrymenBM82x 0 8N1 - 6000
Brymen BM867s ¹ Brymen BM86x (BU-86X) BrymenBM86x 0 8N1 - 50000
Brymen BM869s ¹ Brymen BM86x (BU-86X) BrymenBM86x 0 8N1 - 50000
Digitech QM1350 Metex KS57C2016 Metex14 600 7N2 DTR 4000
Digitech QM1462 FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Digitech QM1537 FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 4000
Digitech QM1538 FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Digitek DT-9062 FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Digitek DT-9602R+ ¹ FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 6000
Digitek DT4000ZC FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Digitek INO2513 FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Duratool DO3122 - DO3122Continuous 9600 8N1 - 4000
ELV M9803R - M9803RContinuous 9600 7E1 DTR 4000
Generic DTM0660 4000 count DTM0660 DTM0660 2400 8N1 DTR 4000
Generic DTM0660 6000 count DTM0660 DTM0660 2400 8N1 DTR 6000
Generic DTM0660 8000 count DTM0660 DTM0660 2400 8N1 DTR 8000
GW Instek GDM-397 ¹ FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 4000
HoldPeak HP-90EPC FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Iso-Tech IDM 73 ES51986 CyrustekES51986 19200 7O1 DTR 6000
MASTECH M9803R - M9803RContinuous 9600 7E1 DTR 4000
MASTECH MAS-343 Metex KS57C2016 Metex14 600 7N2 DTR 4000
MASTECH MAS-345 Metex KS57C2016 Metex14 600 7N2 DTR 4000
MASTECH MS8250B ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
McVoice M-345pro Metex KS57C2016 Metex14 600 7N2 DTR 4000
McVoice M-980T - M9803RContinuous 9600 7N1 DTR 4000
Metex M-3360D ¹ Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Metex M-3640D ¹ Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Metex M-3660D Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Metex M-3830D Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Metex M-3840D Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Metex M-3850D Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Metex M-3850M Metex KS57C2016 Metex14 9600 7N2 DTR 4000
Metex M-3870D Metex KS57C2016 Metex14 1200 7N1 DTR 4000
Metex M-4650C Metex KS57C2016 Metex14 1200 7N2 DTR 20000
Metex ME-11 Metex KS57C2016 Metex14 600 7N2 DTR 4000
Metex ME-21 ¹ Metex KS57C2016 Metex14 600 7N2 DTR 4000
Metex ME-22 Metex KS57C2016 Metex14 2400 7N2 DTR 4000
Metex ME-32 Metex KS57C2016 Metex14 600 7N2 DTR 4000
Metex ME-42 Metex KS57C2016 Metex14 600 7N2 DTR 4000
Metex Universal System 9140 ¹ Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Metex universal system 9160 Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Metrel MD9015 ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
PCE PCE-DM32 ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
PeakTech 2025 ¹ FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 4000
PeakTech 3315 ES51962 CyrustekES51962 2400 7N1 DTR 4000
PeakTech 3330 FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
PeakTech 3415 ¹ DTM0660 DTM0660 2400 8N1 DTR 6000
PeakTech 3430 FS9922-DMM4 QM1537Continuous 19200 7N2 DTR 4000
PeakTech 4010 Metex KS57C2016 Metex14 9600 7N2 DTR 4000
PeakTech 4015A Metex KS57C2016 Metex14 9600 7N2 DTR 100000
PeakTech 4360 Metex KS57C2016 Metex14 600 7N2 DTR 4000
PeakTech 4390 Metex KS57C2016 Metex14 9600 7N2 DTR 4000
PeakTech 451 - PeakTech10 600 7N2 DTR 4000
Pro'sKit MT-1820 ¹ FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 6000
Protek 504 ¹ FS9721 LP3 VC820Continuous 1200 7N2 DTR RTS 4000
Protek 505 ¹ FS9721 LP3 VC820Continuous 1200 7N2 DTR RTS 4000
Protek 506 ¹ FS9721 LP3 VC820Continuous 1200 7N2 DTR RTS 4000
Radioshack 22-805 DMM Metex KS57C2016 Metex14 600 7N2 DTR 4000
Radioshack 22-812 - RS22812Continuous 4800 8N1 DTR 4000
Radioshack RS22-168A Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Sinometer MAS-343 Metex KS57C2016 Metex14 600 7N2 DTR 4000
SparkFun 70C ¹ FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 4000
Tecpel DMM-8061 ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
TekPower TP4000ZC FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Tenma 72-1016 ES51986 CyrustekES51986 19200 7O1 DTR 6000
Tenma 72-6870 ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Tenma 72-7730 ¹ - VC940Continuous 2400 7O1 DTR 20000
Tenma 72-7732 - VC940Continuous 2400 7O1 DTR 40000
Tenma 72-7745 FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Tenma 72-9380A ¹ - VC940Continuous 2400 7O1 DTR 40000
Uni-Trend UT30A ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Uni-Trend UT30E ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Uni-Trend UT60A FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Uni-Trend UT60D ¹ FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 6000
Uni-Trend UT60E FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Uni-Trend UT61A ¹ FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 6000
Uni-Trend UT61B FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 4000
Uni-Trend UT61C FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 6000
Uni-Trend UT61D FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 6000
Uni-Trend UT61E ES51922 CyrustekES51922 19200 7O1 DTR 22000
Uni-Trend UT70B ES51962 CyrustekES51962 2400 7N1 DTR 4000
Uni-Trend UT71A ¹ - VC940Continuous 2400 7O1 DTR 20000
Uni-Trend UT71B - VC940Continuous 2400 7O1 DTR 200000
Uni-Trend UT71CDE - VC940Continuous 2400 7O1 DTR 40000
Uni-Trend UT803 ES51986 CyrustekES51986 19200 7O1 DTR 6000
Uni-Trend UT804 - VC940Continuous 2400 7O1 DTR 40000
V&A VA18B ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
V&A VA40B ¹ FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Velleman DVM4100 ¹ DTM0660 DTM0660 2400 8N1 DTR 6000
Vichy VC99 FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 6000
Voltcraft GDM 703 ¹ WENS98A GDM703Continuous 9600 8N1 DTR 4000
Voltcraft GDM 704 ¹ WENS98A GDM703Continuous 9600 8N1 DTR 4000
Voltcraft GDM 705 ¹ WENS98A GDM703Continuous 9600 8N1 DTR 4000
Voltcraft M-3610D Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Voltcraft M-3650D Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Voltcraft M-3860 Metex KS57C2016 Metex14 9600 7N2 DTR 20000
Voltcraft M-4650CR - Voltcraft14Continuous 1200 7N2 DTR 20000
Voltcraft M-4660 Metex KS57C2016 Metex14 1200 7N2 DTR 50000
Voltcraft M-4660A Metex KS57C2016 Metex14 9600 7N2 DTR 50000
Voltcraft M-4660M Metex KS57C2016 Metex14 9600 7N2 DTR 50000
Voltcraft ME-11 Metex KS57C2016 Metex14 600 7N2 DTR 4000
Voltcraft ME-22T Metex KS57C2016 Metex14 2400 7N2 DTR 4000
Voltcraft ME-32 Metex KS57C2016 Metex14 600 7N2 DTR 4000
Voltcraft ME-42 Metex KS57C2016 Metex14 600 7N2 DTR 4000
Voltcraft MS-9140 ¹ Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Voltcraft MS-9160 ¹ Metex KS57C2016 Metex14 1200 7N2 DTR 4000
Voltcraft MXD-4660A Metex KS57C2016 Metex14 9600 7N2 DTR 50000
Voltcraft VC 630 - Voltcraft14Continuous 4800 7N1 DTR 50000
Voltcraft VC 635 - Voltcraft15Continuous 2400 7N1 DTR 50000
Voltcraft VC 650 - Voltcraft14Continuous 4800 7N1 DTR 50000
Voltcraft VC 655 - Voltcraft15Continuous 2400 7N1 DTR 50000
Voltcraft VC 670 - Voltcraft14Continuous 4800 7N1 DTR 50000
Voltcraft VC 820 FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Voltcraft VC 830 ¹ FS9922-DMM4 QM1537Continuous 2400 8N1 DTR 6000
Voltcraft VC 840 FS9721 LP3 VC820Continuous 2400 8N1 DTR 4000
Voltcraft VC 870 - VC870Continuous 9600 8N1 DTR 40000
Voltcraft VC 920 - VC940Continuous 2400 7O1 DTR 40000
Voltcraft VC 940 - VC940Continuous 2400 7O1 DTR 40000
Voltcraft VC 960 - VC940Continuous 2400 7O1 DTR 40000
Wintex TD2200 ES51922 CyrustekES51922 19200 7N1 DTR 22000

¹ settings taken from the chip, not yet confirmed on hardware with QtDMM.

127 devices across 30 vendors.

Command line

qtdmm [options]
Option Meaning
--config-id <id> Use the named configuration instead of default. Each id has its own settings file, so one meter can be set up per id.
--config-dir <dir> Directory for the configuration files (default: the platform's user config location).
--debug Print every frame received from the meter as hex to the console. Useful when a meter is not decoded correctly — include this output in a bug report.
-h, --help Show the options.
-v, --version Show the version.

Several meters at once

Every QtDMM window is one instance, identified by its --config-id. Start further instances from Instances (Ctrl+N): Add asks for a name and launches a new QtDMM with that id; the list shows which instances are configured, which are running and what each one currently reads, and lets you open or remove them. The ƒ button creates a calculated instance from a name, a unit and a formula in one go (see Calculated values). Running instances know about each other through shared memory — the same mechanism that stops two windows from using the default id at once. An instance can also compute its value from the others' readings, see Calculated values.

Debug output

--debug writes each received frame as a line of hex bytes, e.g.

30 30 30 30 30 31 3B 30 30 30 3A 30 0D 0A

These lines are exactly what the decoder test fixtures are made of, so a short capture together with what the meter displayed at the time is the most useful thing to attach when reporting a decoding problem.

Licensing

  • 0.9.5 until today tuxmaster and various contributors, see AUTHORS file
  • 0.9.3 and before (c) 2001-2016 M.Toussaint qtdmm@mtoussaint.de

QtDMM 0.9.0 and beyond is distributed under the GNU Public License, version 3. (Prior to 0.9.0 are licensed under GNU GPL 2.0)

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Qt5 port of the QtDMM of M.Toussaint

www.mtoussaint.de/qtdmm.html

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