MEATEST M632 Real-Resistance Decade


Resistance decades with ranges as wide as 14 decades. Sophisticated design and switching algorithm provides zero residual resistance, high accuracy and temperature stability for the most demanding applications.

  • Real resistors switched by relays
  • 14 decade range, resolution from 1 μΩ
  • Custom units and time sequences
  • No residual resistance
  • 20 ppm accuracy / 5 W load capacity

Authorised Australian Distributor

pdf    M632 Datasheet
pdf    M632 Operation Manual
pdf    M600 series Application Note
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The MEATEST M632 Real-Resistance Decade is a precision 20 ppm reference instrument for calibration laboratories and is the flagship of Meatest’s resistance calibration. Containing some of the most stable (and expensive) foil resistors available, the M632 has just 1 ppm/°C temperature coefficient.

The MEATEST M632 Real-Resistance Decades can be used for AC application as well, see datasheet for typical frequency responses.

The Meatest M632 is a precise resistance decade box with range from 1 Ω to 1.2 MΩ. Basic accuracy is 0.003 %. Best resolution at the lowest range is 10µΩ. Decade contains stable foil resistors with low temperature coefficient switched by low thermal voltage relays. Built-in software contains function of RTD temperature sensor simulation with parameters according to IEC (DIN) or US standards, temperature setting in degree of Celsius or Fahrenheit. Instrument can be controlled via RS232, USB, LAN or GPIB interface. M632 is sophisticated instrument with its own recalibration procedure. The procedure enables to correct any deviation in resistance without any mechanical adjusting. Decade box is designed for checking parameters of resistance meters, regulators and process meters that use external resistance sensors for non-electric quantity measuring.

User Friendly

The MEATEST M632 Real-Resistance Decade was made to make resistance calibration as easy as it gets. Large LCD shows all related parameters including total accuracy. And there is no residual resistance or hidden absolute error so you don’t have to calculate it by yourself, accuracy you see is what you get. And that’s not the only thing that firmware sorts out for you. Would you like the resistance shown in temperature units? Distance? Force? RTD and user function will do this for you. Complete recalibration? Ten minutes and off you go.


All decades’ functions can be remotely controlled via RS232, USB, LAN or GPIB interface. This way you can introduce calibration/test stage directly into production line of any resistance based sensor and reduce time required for final quality tests dramatically.

General specification

  • Maximal voltage:200 V pk
  • Maximal current: 500mA
  • Maximal load: 0.25 W
  • TC of used resistors: < 1 ppm/ °C
  • Reaction time: 6 ms
  • Switching method: Fast / Smooth / Via short / Via open
  • Terminals: gold plated terminals 4mm
  • Remote control: RS232 interface (optionally USB, LAN, IEEE488)
  • Power supply: 115/230 Vac, 50/60 Hz
  • Reference temperatures: +20°C … +26°C
  • Working temperatures: +5°C … +40°C
  • Storage temperatures: -10°C … +50°C
  • Dimensions: W 390 mm, H 128 mm, D 310 mm
  • Weight: 5.2 kg



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