Archived: TM3-Primus

Archival: Compact 4.3" desktop metering device for all creative fields of the music industry

NOTE: This device is no longer available!

TM3-Primus units are highly compact and innovative, easy-to-use products, giving music, voice, and multimedia producers in professional as well as non-commercial environments everything they need. Therefore, the loudness and audio metering devices include frequently used standard instruments and parameters in supreme quality to meet the demands of a wide variety of applications.

  • Horizontal or vertical use, as desktop or panel-mount unit
  • Analog or digital Stereo signals, digital Stereo and 5.1 signals via USB
  • USB hybrid function for direct access of audio signals from a DAW

The Displays

The graphical user interface used in the units is controlled simply by using your finger. Instruments can be selected and will be combined for an optimized reading. All commonly used parameters are set, just a few need to be adjusted by the user to meet individual requirements.


  • Compact unit with full feature set for multifunctional audio measurements (analog, digital, USB audio)
  • Table-top or 2U panel-mount unit with display, USB connecting cable, and external USB mains adapter
  • 4.3“ capacitive touch screen (272 x 480 pixel)
  • Optimized screen layout with selectable instruments
  • Analog 2-channel stereo input via unbal. RCA, adjustable from –22 dBu (61 mV) to +24 dBu (12.28 V)
  • Digital 2-channel stereo in- and output via S/PDIF (RCA, unbal.)
  • Micro-USB connector for digital audio inputs (stereo, 5.1) and USB power supply (USB mains adapter or computer)
  • PPM/TruePeak meter with analog and digital scales
  • Moving Coil instruments with PPM, VU, and BBC modes
  • Loudness measurements acc. to EBU R128, ITU-R BS.1770-3/1771-1, ATSC A/85, ARIB, OP-59, AGCOM, or CALM Act
  • Summing Loudness bargraph, M, S, or I value selectable
  • Numerical displays
  • LRA instrument (Loudness Range) with MagicLRA mode
  • Loudness Chart instrument (course over time)
  • 2-channel Audio Vectorscope
  • Stereo Correlator (phase meter)
  • Real Time Analyzer (RTA)
  • Monitoring instrument with onscreen level fader
  • Downmix of USB Surround signals, output via S/PDIF Out connector
  • Keyboard
  • USB hybrid function: Using USB Connect software allows simultaneous monitoring and metering, e. g. right from a DAW

Model Versions

The TM3-Primus desktop unit is economical in space due to its compact dimensions. For installation in front panels, a version with mounting frame is available.


Desktop unit in a sturdy table-top frame with integrated table-stand (approx. 82.5 x 138 x 50 mm, W x H x D), USB connecting cable, and USB mains adpater


2U panel-mount unit with mounting frame for front panels (approx. 82 x 160 x 29.7 mm, W x H x D), USB connecting cable, and USB mains adpater

TM3-Primus Measures Computer Audio

The TM3 Primus can measure stereo or 5.1 signals from a computer via its USB connection, provided it has been defined as a USB audio device for sound output (Mac® OS X) or as a default playback device with the Primus USB audio driver installed (Windows®) on the corresponding computers. Alternatively, you can install the USB Connect software.

USB Connect Software

With the USB Connect plug-in and stand-alone application, available free of charge, and the USB hybrid functionality of the TM3-Primus devices, you can simultaneously monitor and meter audio signals from a computer. Furthermore, you can remote control the loudness functions Start/Stop/Reset, the time segment of the Chart, and the reference of the RTA.

Learn more >


Data sheets, product information, manuals or firmware of TM3-Primus for download (as far as still available) can be found on the corresponding archive page in our download area (Support/Manuals & Software Downloads/Archive).