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M6x2 Real-Resistance Decades

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
  • Six different languages

M632 and M642 are programmable real-resistance decades with far-reaching ranges and very fine resolutions. While the M642 is rather an industrial decade with its 0.1 Ω - 20 MΩ range (22 MΩ upgrade available) and 5 W load capacity, the M632 is 20 ppm reference instrument for calibration laboratories and 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. Decades can be used for AC application as well, see datasheet for typical frequency responses.

Languages: English, German, Spanish, French, Russian, Czech

User comfort

M6xx series 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.


Resistance 1 Ω - 1.2 MΩ, resolution from 10 uΩ
max dissipation power 0.25 W
± 20 ppm / year
Temperature RTD ± 0.01°C / year


Resistance 100 mΩ - 20 MΩ (22 MΩ), resolution from 1 uΩ
max dissipation power 5 W
± 200 ppm / year
Temperature RTD ± 0.1°C / year
Datasheets M632: pdf pdf M642: pdf pdf
Manuals M632: pdf M642: pdf
Slides pdf
Remote control SW pdf
LabVIEW driver zip

Versions & Options:

M632-V1000 precision wide range decade with and RS232
M642-V1000 industrial wide range decade with and RS232
M6xx-V2xxx GPIB, USB and Ethernet interface extension
M642-Vx2xx 22 MΩ range extension for M642
M6xx-Vxx1x 19" rack version, height 3HE
All Meatest instruments are available with 3, 4 and 5-year extended warranties.
Delivered with EU plug. Can be swapped for other types on demand.


GPIB cable IEEE488-IEEE488 cable, 2m
RS232 adapter RS232-USB generic adapter
RS232 cable male-female RS232 cable, 2m