- Resistance Range: 100.000 mΩ – 20.0000 MΩ
- Resistance Accuracy: +/- 200 ppm
- Operating Voltage: 200 V
- RTD Temperature Sensor Simulation
- Simulation Accuracy: +/- 0.1 °C
- User-defined Curves (conversion tables)
- Interfaces: RS232 (optional USB, IEEE488, Ethernet)
The Model M642 is a precise resistance decade box with a range from 0.1 Ω to 20 MΩ. Its basic accuracy is 0.02 %. The best resolution at the lowest range is 1 µΩ. The decade contains stable high-load resistors with a low temperature coefficient, switched by low thermal voltage relays. Built-in software includes a function for simulating RTD temperature sensors with parameters according to IEC (DIN) or US standards, and temperature settings in Celsius or Fahrenheit. The instrument can be controlled via RS232, USB, LAN, or GPIB interfaces.
The M642 is a sophisticated instrument featuring its own recalibration procedure. This procedure allows for correcting any deviation in resistance without the need for mechanical adjustment.
This decade box is designed for checking the parameters of resistance meters, regulators, and process meters that use external resistance sensors for measuring non-electrical quantities.
