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Keithley 244, Instruction Manual, Page: 33 / 36

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Keithley 244 Instruction Manual Download Page 33

Summary of Contents for 244

Page 1: ...INSTRUCTION MANUAL Model 244 High Voltage Supply and Model 2441 Overload Protection Option COPYRIGHT 1976 KEITHLEY INSTRUMENTS INC FOURTH PRINTING DEC 1977 CLEVELAND OHIO U S A...

Page 2: ......

Page 3: ...HEMATICS 25 ILLUSTRATIONS Figure NO Title Page 1 Model 244 High Volt Supply 1 2 FrOnL Panel Controls 3 3 Rear Panel Controls 3 4 current Limiting 5 5 Simplified Circuit Diagram 6 6 Overload Protection...

Page 4: ...hour or in subsequent S hour periods after a one hour warm up LINE KECULATION O OOl for a 10 change in line voltage LOh REGULATION O OOl for a 5 milliampere load change RIPPLE AN NOISE Less than 0 5 m...

Page 5: ...ucput current to less than 13 milliamperes with automatic recovery when overload is removed c Stability Solid state design stable range resistors and selected zener diode provide voltage stability of...

Page 6: ...2ml volts 2 b rim Control R146 Permits interpolation between steps with O 25 volts maximum trim 2 a VBRLOAD Indicator Pilot light glows when output current exceeds 11 I approximately 2 3 eter MlOl In...

Page 7: ...SlO3 output Selector switch X04 MlOl Switch indicator Indicator SlOl DS102 OSlOl FIGURE 2 Front Panel Controls Switch 5102 117 234V F LTC5 COWS OUTPUT Switch FlOl Overload Receptacle 5103 Input J l z...

Page 8: ...e b Output Voltage Connect an accurate voltmeter such as Keithley Model 153 to the output to verify the power supply voltage accuracy The Trim Control should be set to CAL position measure the Model 2...

Page 9: ...TIVE La4ix a When a capacitive load is connected to the out put Model 244 will deliver a charging current up to 14 milliamperes maximum until the dialed voltage is developed across the load During the...

Page 10: ...regulator circuit to correct the output voltage The overload circuit senses the out put load current and controls the current within design limits This circuit also provides an over load indication 1...

Page 11: ...e drop across resistor R124 A current limit amplifier consisting of Q107 controls the error am plifier through diode D112 When the current through R124 exceeds approximately 11 milliamperes transistor...

Page 12: ...el 4003A is a rack mounting kit with overall dimensions 5 l 4 inches hFgh x 19 inches wide Two cop covers are provided for use with either 10 inch or 13 inch deep instruments Application The Model 400...

Page 13: ...ith either 10 inch or 13 inch deep instruments Application The Model 4004A converts the instrument from bench mounting to rack mounting It is suitable for mount ing two inseruments in a standard 19 in...

Page 14: ...d by the picoammeter will ultimately be limited to no more than 200 of the full scale range of the picoammeter However current limiting of the Model 244 will occur whenever the Model 244 output exceed...

Page 15: ...is composed of an emitter fallower transistor Q201 which drives a transistor switch Q202 which is paralleled wieh the Model 244 overload transistor switch 4107 A filter circuit is composed of R203 and...

Page 16: ...U or RG59 U The cable size Il used with this connector should not exceed 257in 0 1 Assembly Instructions 4 Solder contact to center conductor 5 Slide back end p rts forward then thread assembly into...

Page 17: ...Film MY Mylar W watt ww NO Number i Wirewound ww ar Wirewound Variable 5 2 ELECTRICAL SCHEMATICS AND DlAGRANS Schemaeics Sales Service Department Keithley lii truments Inc and diagrams are included t...

Page 18: ...Slotted Bottom Cover Assembly 2 cover 3 Fastener Feet Assembly 4 Feet 5 Ball 6 screws 8 32x3 8 Phillips Pan Head Tile Bail Assembly 7 Bail 8 Right Assembly 9 Left Assembly 10 Screws 1 6 32x1 4 Phillip...

Page 19: ...MODEL 244 HIGH VOLTAGE SUPPLY REPLACEABLE PARTS FIGURE 8 To Cover Assembly I 1176 15...

Page 20: ...106 5107 5108 ___ connector lnl P Solde connector Mini P Solde connector mini P S de Receptacle female Connecfor male mate far J108 BRG 20052 lx 237 3 Bps 47439 E 236 10 BRG 47439 CS 236 10 BRG 47439...

Page 21: ...8K n 120K n 1 5M n 475K R 1K R 1K R 1K R 604 n lO l 4 w IO l 4 w lO 1 2 w lo l 2 w lO l 2 w lO l 2 w lo l 2 w lO l 2 w l l 2 w l l 2 w 1 l 2 w l l 2 w 5 10 w 1 l 2 w l l 8 W 1 l 2 w l l 8 w lO l 2 w l...

Page 22: ...OHM OHM CEA CEA mm m9 GB INS 115 550 MMF1 2T9 mm1 2T9 MMF1 2T9 W1 2T9 blMFll2T9 MMFl ZW MMFlf2T9 MMF1 2T9 mm n9 m m 2T9 MMFl ZT2 MMF1 2T2 MMFlf2T2 m1 2T MNF1 2T2 mm 2T2 W1 2T2 MMm 2T2 lWF1 2TZ wm1 2T...

Page 23: ...read 18 volts to 22 volts Ripple should be no more than 10 m peak to peak 2 Amplifier Operation a Output switch on 244 must still be in the OFF position b Connect 155 Microvoltmeter HI to TP J and LO...

Page 24: ...Connect Decade Capacitor Box to 244 output through MH TEE Connector b Set oscilloscope as follows TIME BASE 1 MSIDIV TRIGGER INTERNAL VERTICAL SENSITIVITY 1 WIDIV c Connect oscilloscope to 244 output...

Page 25: ...ARITY C 1 e see 244 controls for 220 volts and turn 244 output s itch on f Step 662 and 244 thru settings listed in Table 6 2 take reading shown Reading must be within range given Turn output off when...

Page 26: ...ADJUST FOR II mA LOAD HV TUBE EV8068 TFtANSFORMER INSULATION TO 5kV ym c MFR STANCOR P 8190 TRIAD F 52X l IV KEITHLW MOML 669lA 100 I DIVIDER Ol DC OUT GND F GND _ c51 5ocKw 1 I I I I AC OUT L _I pL...

Page 27: ...s Corp Scottsdale AZ 85252 Dale Electronics Inc Columbus NE 68601 Erie Technological Products Inc Brie PA 16512 Fairchild Instruments Corp Mountain Vie CA 94043 General Electric Company Syracuse NY 13...

Page 28: ......

Page 29: ...SWitchcraft 1 C 5527 N Elsfo he Chicago III 60630 670...

Page 30: ...I I...

Page 31: ...RI04 Cl0 RIO RIO...

Page 32: ...ge D105 ITo Cl17 4 D116 E D115 C l D114 RlOl u l RI03 D RI04 r v m A RI05 N co RI06 a RI07 RI00 Rl69 g f R113 rDlOh LR116J __ Cl07 I JIOI cl C R140j 5 g u mR141 1 g cl106 I a s R142J c yD1081 9 co i z...

Page 33: ...Q20 I 3 ro1c k...

Page 34: ...ils see reverse side of this form I I z 3 To help repair the instrument briefly describe the problem JJ L I Is the problem Constant Intermittant Under what conditions does the problem occur iif Contro...

Page 35: ...llow ing categories 1 Report of Calibration Certified Traceable to the National Bureau of standards 2 Calibration Report 3 Certificate of Compliance 4 Recalibration All calibration and certification p...

Page 36: ...ource El List the positions of fl controls and switches on both front and rear panels of the instrument El 4 Describe input signal source levels frequencies etc a List and describe all cables used in...

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