The Keithley 2510-AT is a 50 W bipolar thermoelectric cooler (TEC) controller that combines TEC drive and electrical measurement functions. It is designed for temperature control in continuous-wave laser-diode LIV (light-current-voltage) test systems and other tests of actively cooled optoelectronic devices. A compatible temperature sensor provides feedback to the digital proportional-integral-derivative (PID) control loop.

The 2510-AT adds automatic PID tuning to the base 2510 platform. Its autotuning function calculates the control-loop coefficients and offers minimum-overshoot and minimum-settling-time modes. It can regulate temperature, voltage, current, or thermistor resistance, with a temperature-setpoint range of −50 °C to +225 °C and TEC output of up to ±10 V DC and ±5 A DC.

Supported feedback devices include thermistors, RTDs, and compatible solid-state temperature sensors. Four-wire sensor-lead checking helps identify open or shorted connections. TEC current, voltage, power, and resistance measurements support evaluation of the thermal control system; the AC-resistance function uses pulsed current reversal and is available over the bus only. IEEE-488 and RS-232 interfaces support automated test integration.

Typical model applications include laser-diode modules, cooled photodetectors, thermal-optic switches, and temperature-controlled fixtures. Select the sensor, TEC load, cabling, and programmed limits for the intended device. The stability figures in the specifications below are manufacturer ratings under the stated sensor, ambient-temperature, and time-period conditions.