Keithley 240A(Model240) free download

File name 240A(Model240).pdf

MODEL 240 VOLTAGE SUPPLY CONTENTS TABLE OF CONTENTS Page Section I. - Introduction. . . . . , . . . . . . . . . . . . . . l-l Section II. - Specifications . . . . . . . . . . . . . . . . . . 2-1 Section III. - Operation . . . . . , . . . . . . . . . . . . . . 3-L Section IV. - Circuit Description . . . . . . . . . . . . . . . 4-l Section V. - Maintenance . . . . . . . . . . . . . . . . . . . 5-l Section 6. - Replaceable Parts List . . . . . . . . . . . . . . 6-1 Voltage and Resistance Chart . . . . . . . . . . . . . . . . . . Schematic Diagram . , . . . . . . . . . . . . . * . . * . . . . MODE,L 240 VOLTACL LUPI'LY SECTION I - INTRODUCTION The Keithley Model 240 Regulated High Voltage Supply is a line oper- ated source of dc potential, It provides constant, accurate output for safe and convenient testing of insulation, diode and capacitor leakage resistance, and it thus complements the Keithley line of electrometer equipment, The output can be set from zero to 1000 volts in increments of one volt, The Model 240 may also be used as a general purpose laboratory volt- age supply, furnishing excitation potentials to ion chambers and photocells, and supplying a buck-out potential for precise voltage measurements by the null method, It may be used as a stable dc potential in checking dc amplifier gains! calibrating meters, and in production testing, Used in conjunction with a Keithley electro- meter, resistance over the range of 0.1 ohm to 1016 ohms can be measured, FIGURE 1. Keithley Model 240 Regulated High Volt- age Supply equipped with end frames for bench use. 0762R l-l MODEL 240 VOLTAGE SUPPLY SPECIFICATIONS SECTION II - SPECIFICATIONS OUTPUT: Voltage: 0 to 1000 volts dc in L-volt steps. current: 10 milliamperes dc maximum. Polarity: Positive or negative with respect to chassis. ACCURACY: kl% of dial setting or 2100 millivolts, whichever is greater. RESOLUTION: A "Trim" Potentiometer