Kepco Series JQE Power Supplies are general purpose, precision regulated voltage sources in the "half rack” configuration. JQE Power Supplies feature full range voltage control and current limit adjustment by means of multi-turn front panel controls. JQE power supplies have linear, full-dissipation series-regulators (NPN) driven by an integrated circuit operational amplifier. A sharp current-limit circuit renders the power supply completely short-circuit proof. JQE power supplies may be readily converted to provide constant current by the addition of an external sensing resistor and a "current control." The output of the JQE power supply is completely programmable. All necessary connections are available on terminals at the rear barrier-strip. 1-5 The compact design of the Kepco JQE "HALF-RACK" Series was made possible by a unique heat sink design of exceptional efficiency in combination with highly reliable low-noise fans. JQE power supplies feature all-silicon design with conservatively rated components for added reliability. 1-6 JQE power supplies are identical in their mechanical dimensions (Refer to FIG. 1-3) and in their electrical specifications, except as noted in TABLE 1-1. 1-7 OPTIONS. Optional features of Kepco Power Supplies are indicated by a letter following the model designation: a) JQE Power Supplies with suffix "E" are equipped with an "Ej0 Null" adjustment, which allows exact zero calibration for precision programming applications. b) JQE Power Supplies with suffix "M" are equipped with two dual range panel meters which permit simultaneous monitoring of the output voltage and output current. Meter range-switches allow for full scale reading of either 10% or 100% of the voltage and current outputs. c) JQE Power Supplies with suffix "T” have special references which improve the temperature coefficient of the supply (see paragraph 1-11 for specifications). d) JQE Power Supplies with suffix "VP" are equipped with an overvoltage protector. This electrical "crowbar" shorts the output through a silicon controlled rectifier (SCR) if the output voltage exceeds a preadjustable limit on the protector (see paragraph 1-12 for specifications). e) JQE Power Supplies with suffix "Y" are equipped with a separate control-amplifier and additional programming terminals for remote control of the output current. Option "E" is included with the "Y" option models.