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Keithley 242, Instruction Manual, Page: 17 / 28

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Keithley 242 Instruction Manual Download Page 17

Summary of Contents for 242

Page 1: ...INSTRUCTION MANUAL MODEL 242 REGULATED HIGH VOLTAGE SUPPLY...

Page 2: ...representative or the factory DDD 216 795 2666 You will be given assistance and shipping instructions REPAIRS AND RECALIBRATION Keithley Instruments maintains a complete re pair service and standards...

Page 3: ...ICING 7 4 1 General 7 4 2 Servicing Schedule 7 Section Page 5 6 4 3 Parts Replacement 7 4 4 Troubleshooting 7 4 5 Procedures to Guide Troubleshooting 8 4 6 Correcting for No Output 9 4 7 Correcting fo...

Page 4: ...rift is prevented by a chopper circuit with a temperature compensated zener diode reference a photo modulator comparator and wirewound sampling resistors c The Model 242 uses heavy duty thermionic rec...

Page 5: ...lated hn type Ground Binding post POWER 105 125 volts SO 60 cps 250 watts 210 250 volt models available DIMENSIONS WEIGHT 7 inches high x 19 inches wide x 13 l 4 inches deep net weight 39 pounds ACCES...

Page 6: ...IGH VOLTAGE Switch is ON When the Switch is off the high voltage output is discon nected although the filament and low voltage circuits continue operating The Fuse for the high voltage circuit is next...

Page 7: ...RLOADwill also light if the circuits are not warmed up When the OVERLOADbulb lights put the HIGH VOLTAGE Switch off and wait 30 seconds Then put on HIGH VOLTAGE Switch again e If desired use the TRIM...

Page 8: ...mer T3 If the HIGH VOLTAGE Switch 54 is off the Ll control relay K2 will close The circuit mwc to transformer T2 which supplies high vol tages to the series regulator can now op erate when the HIGH VO...

Page 9: ...output b For low frequency fluctuations at the output the voltage divider and the sampling resistors on the decade switches divide the _ output voltage The photo modulator ElOl compares the reference...

Page 10: ...ments Inc or its repre sentative as well as other parts marked for Keithley manufacture in the Replaceable Parts List 4 4 TROUBLESHOOTING a The procedures which follow give instructions for repairing...

Page 11: ...ated does not work check through each circuit as described in the following paragraphs Refer to the cir cuit description in Section 3 to find the more crucial components and to determine their functio...

Page 12: ...rectifiers VlO and Vll the series resis tor R113 Figure ll the filter capacitor Cl06 Figure 8 and the primary winding of transformer T2 Figure 8 for 117 volts ac If no voltage appears on the transform...

Page 13: ...justment Refer to paragraph 4 8 minimum ripple appears on the oscilloscope for procedures and Table 1 for equipment c If the potentiometer does not have suf ficient range to lessen the noise check cap...

Page 14: ...limit of error Total limit of error of this system is f0 03 The Model 660A Differential Voltmeter may be used directly for output voltages from 300 to 500 volts b Turn on the Model 242 Set the output...

Page 15: ...2 Output Accuracy See Table 3 for equipment Use coaxial cable to connect the Models 242 and 6601A Control Zener Adjustment Circuit Desig R133 Fig Ref 9 Refer to Paragraph 4 7 High Voltage Adjustment L...

Page 16: ...VOLTAGE SUPPLY CALIBRATION W R21 R20 Rm SH Figs 10 11 FIGURE 8 Top View of Model 242 Chassis The illustration shows the location of com ponents and printed circuit Refer to Figure 9 for a bottom view...

Page 17: ...CALIBRATION MODEL 242 VOLTAGE SUPPLY z FIGURE 9 Bottom View of Model 242 Chassis The illustration shows the location of corn ponents and internal controls Refer to Figure 8 for a top view 14 086 5R...

Page 18: ...MODEL 242 VOLTAGE SUPPLY CALIBRATION FIGURE 10 Tube Diode Capacitor and Modulator Locations on Printed Circuit Board PC 100 Resistors are shown in Figure 11 0865R 15...

Page 19: ...CALIBRATION MODEL 242 VOLTAGE SUPPLY FIGURE 11 Resistor Locations on Printed Circuit Board PC 100 Other components are shown in Figure 10 16 0865R...

Page 20: ...ignation and a description of the part All structural parts and those parts coded for Keithley manufacture 80164 must be ordered from Keithley Instruments Inc or its representative In ordering a part...

Page 21: ...72982 801 OOO Z5U OOl 102M c22 oolM 10 MY 02777 P 12M C66 lM 10 MY 99120 LK50 555A C51 05 5M 8 CerD 72982 CerD 56289 CerD 72982 CerD 72982 CerD 71590 MY 02777 841 000 25UO 203M 5GAD22 all 000 25UO 10...

Page 22: ...o req d Mfg No 342012 75915 FU 25 71400 FU 10 75915 FH 3 Jl Receptacle hn OUTPUT 80164 cs 79 52 Receptacle hn OUTPUT 80164 cs 79 F Plug hn Mate of Jl and 52 Mil No IJG 59A U Mfg No 82 38 Binding Post...

Page 23: ...l 2 w 7 5 m l l 2 w 500 n lO 2 w 6m l 1 w Comp Comp ww Comp Comp 01121 EB 01121 EB 63743 5x 01121 EB 01121 EB Comp DCb DCb Comp ww 01121 EB 79727 CFE 15 79727 CFE 15 01121 HB 44655 4654 Comp Comp WV C...

Page 24: ...w w 25 15 w w 15909 1250 Rll 22 5K 8 w 15909 1250 Rll 22 5K 8 w 01686 7010 RLO 900K 8 w 01686 7010 RlO 450K a w 01686 7010 RlO 225K 8 R211 R212 R213 R214 R215 225 kn 25 15 w W 01686 7010 RlO 225K 8 9m...

Page 25: ...12AX7 10 v4 7235 86684 EV 7235 10 v5 OG3 73445 EV OG3 10 6 12AX7 80164 EV 12AX7 10 v7 12B4A 85599 N 12B4A 10 V8 6X4 81453 EV 6X4 10 v9 OB2 86684 N OB2 10 VlO 3B24W 86684 EV 3B24W 10 Vll 3B24W 86684 N...

Page 26: ...tric Co Mount Vernon N Y 79727 Continental Wirt Electronics Corp Philadelphia Pa 80164 Keithley Instruments Inc Cleveland Ohio 81453 Raytheon Co Industrial Components Div Industrial Tube Operation New...

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