This is our most sophisticated instrument.

This automated bridge is made for us by Measurements International of Canada. Isotech call it the T.T.I. 3. It is the solution to sub-millikelvin measurement problems. In co-operation with the National Research Council in Ottawa, this design has been tested and approved to the highest standards. Used in conjunction with two or more of our standard PRT's this bridge is capable of the most demanding measurements, differences of temperature of 1 or 2 microdegrees can be measured using our special measuring technique, available here Document 51Kb

Thermometers are described on pages 29 to 33.

A 20-way Matrix Scanner and full software control is available with this indicator.

The only changes made for us by this supplier is the repositioning of the terminals to the front panel for ease of use.

Stand alone operation or IEEE-488 bus controllable

Auto balancing measurements to nine significant digits

Linearity of 0.02ppm or better

Measurement range from 0.001 ohms to 10 kilohms

Microprocessor controlled self calibration

Measurement uncertainty <0.2 ppm of full scale <0.05mK 25 ohm thermometer.