Model CTR6500

AC resistance thermometry bridge

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  • High-performance AC resistance thermometry bridge for very accurate temperature measurements in a range of -200 ... +962 °C (-328 ... +1,763.6 °F)
  • High-precision instrument designed for laboratory, commercial and industrial temperature measurement and calibration applications

Special features

  • Resolution 0.1 ppm / 0.001 mΩ / 0.01 mK
  • 25 Ω and 100 Ω internal reference resistors
  • Channels expandable from 1 to 60 via multiplexers
  • Multifunction VFD with numeric, statistical or graphical information


The performance of the model CTR6500 resistance thermometry bridge is improved significantly by using the proven AC bridge technology. Due to the elimination of thermal EMF errors and the automatic cancellation of probe and cable reactance effects, the CTR6500 provides exceptional stability with time and ambient temperature and has an excellent resolution thanks to inherently low noise.

These make the CTR6500 perfectly suited to high-accuracy temperature measurement and calibration.

The CTR6500 has 25 Ω and 100 Ω internal standard resistors and can also be used with external standard resistors. It has a ratio range of 0 ... 4.9999999 or 0 ... 500 Ω resistance and is capable of measuring temperature ranges to meet ITS 90, CVD and EN 60751 standards.

The results are shown on the large-scale, multi-function VFD screen. The mean, min and max value, standard deviation and the sampling rate can also be displayed with a separate graphical display. To ensure the long-term reliability the CTR6500 uses surface mount technology with no mechanical relays.

AC resistance thermometry bridge
  • AC resistance thermometry bridge

Advantages of AC resistance thermometry bridges

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