Keithley Instruments 7057A Overview

• Cold junction compensated
• 2-pole Form A
• <1µV of switch contact potential
• Permits monitoring of up to nine thermocouples or other transducers
• The nine signal channels use a guarded 2-pole configuration
• An isothermal block provides electrical isolation up to 42V while assuring excellent thermal conductivity between cold junction terminations
• A sensing device mounted in the isothermal block monitors the cold junction and outputs a calibrated reference voltage that is linearly related to the temperature

The Keithley 7057A, Scanner Card, provides a higher change in reference output for improved cold junction sensitivity. Formulae for converting the voltage outputs of all of the most popular thermocouple types are included in the manual. The contact potential of <1µV per channel translates to <0.025ºC error for precision measurements on type K thermocouples.

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