The 1594A and 1595A combine the accuracy of complex and expensive bridges with innovative features that simplify measurement processes. Has the capability to calibrate SPRTs, PRTs, RTDs and thermistors with a range of 0 Ω to 500 k Ω. Accuracy as good as 0.06 ppm (0.000015°C), and one year absolute accuracy of 4 ppm (0.001°C). The front panel has 4 input channels which accept sensors under test or external references. The rear panel has two dedicated reference resistor inputs.
The unit has internal memory capable of 80,000 individual time/date stamped readings, and computer communication is possible via RS-232, USB, IEEE-488, and Ethernet.