Model M642 is a precise resistance decade box with range from 0.1 Ω to 20 MΩ.
Basic accuracy is 0.02 %.
Best resolution at the lowest range is 1 µΩ.
The Decade contains stable high load resistors with low temperature coefficient switched by low thermal voltage relays.
Built-in software contains function of RTD temperature sensorsimulation with parameters according to IEC (DIN) or US standards, temperature setting in degree of Celsius or Fahrenheit.
The Instrument can be controlled via RS232, USB, LAN or GPIB interface.
M642 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.