Starting with serial number 3316-1, models KMPV50-0.5-J2, KMPV11-1- LJ2, KISDP-1-J2 [HgCdTe and InSb photodiodes with dual integral amplifiers] will have an automatic on/off feature. The power to the amplifiers and detector is turned on when the temperature approaches the operating point [77K]. When liquid nitrogen is depleted, power is turned off at temperatures above 100K.
The detector/amplifier interface is optimized for 77K operation. When the detector is not cold, its impedance changes and this may stress the amplifiers if the power is on for an extended period. The power should always be turned off when the detector is not cooled.
The automatic on/off feature prevents problems by avoiding an accidental power on condition.
6Oct1998