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Summary of Contents for 427

Page 1: ...INSTRUCTION MANUAL MODEL 427 CURRENTAMPLIFIER 0 1975 KEITHLEY INSTRUMENTS INC CLEVELAND OHIO U S A DOCUMENTNUMBER29103...

Page 2: ...CONTENTS MODEL 427 CONTENTS 1 GF Ng3 L DESCRIPT ON 1 2 OPERATION 4 3 APPLICATIONS 9 4 ACCESSORIES 10 5 ClRC IT DESCRIPTION 12 6 REp Cp LE PARTS 17 7 CALIBRATION 26 SCNEMATICS 33 1074...

Page 3: ...ctrum 7 9 Effect of Input Capacitance on Noise 7 10 Frequency Compensafian _____ _ __ 7 11 Plot of Noise Improvement Contours __ _____ __ __ 9 12 Block Diagram of a High Speed Current Amplifier 12 13...

Page 4: ...eight decade ranges with 0 1 resolution lO turn poten tiometer Stability is O Zo of suppressed value per C bO Z per day INPUT VOLTAGE DROP Less than 400 IV for fullaxle output on the 10 to 10 volts a...

Page 5: ...ication Accurate measurements are assured since overloads are automatically indicated l 2 FEATURES e Variable Cain The GAIN Switch is designated a Wide Dynamic Range Selectable rise times permit in ei...

Page 6: ...ession Adjusts output zero Input source connection Output connectFon Indicates overload condition 2 4 al 2 4 a2 2 4 a3 2 4 a4 2 4 a5 2 4 a6 2 4 a7 2 3 a 2 3 b 2 5 d TABLE 1 2 Rear Panel Controls and T...

Page 7: ...27 GENERAL DESCRIPTION GAIN SWITC S20 SUPPRESSION FINE POLARITY ADJUST SWITCH INPUT 5202 P ZERO ADJ OVERIDAD Power OUTFW R235 DS302 S302 5102 FIG RF 2 want Panel Controls I FIGURE 3 Rear Panel Control...

Page 8: ...od c re t is measured by the voltage drop ac ee a resistor Prom this equation it is irmnediately apparent that the m QB rement of emall current equi es large values of R i e high impedance levels Howw...

Page 9: ...e theoretical performance limftetion of the shunt yetem c n be calculated FO F LOG FREWENCY FIGURE 6 ny tailoring the frequency response of the amplifier Pig 6a the frequency response of the shunt met...

Page 10: ...e 9h This illustrates the well known fact that signal to noise performance of a measurement cen t be improved by feedback techniques At the high frequency end the voltege noise is limited by the frequ...

Page 11: ...d 12 dB octeve is required The effect of e 6 dB filter is shown in Figure 9a end h The filter is used to limit the system bandwidth to a frequency F2 smaller then Fl The effect af this filter on the n...

Page 12: ...ment of zero offset through the u e of the OVERLOAD indicator b Rear Panel 1 Line Voltage Switch S301 Sets instrument for either 117 or 234 V operation Fuse RequirP ment 3AG Sla Slo 117V 1 4A Keithley...

Page 13: ...arm ante obtainable with the shunt method of measuring current The best noise risetime product that can be achieved for d c measurements with 100 pF shunt capacitance in a shunt system is 7 x lo 15 am...

Page 14: ...The Model 1007 co erts any half rack style M instrument from bench mounting to rack mounting in a standard 19 inch rack The kit may also be used for rack mounting 19 inch full rack width insfru ltE t...

Page 15: ...riSina1 hardware Item 8 With the screws removed insert the mounting clamp behind the corner bracket Item 7 and replace the screws to hold the mounting clamp in place 4 Tighten the screwy Item 8 on ins...

Page 16: ...ie composed of e high gain amplifier connected aa e 12 dB octave low pass filter es sham in Figure 13 The amplifier consists of intel rated circuit QAlOl end tp t stege QlOl end Q102 Full scale outpu...

Page 17: ...Cl01 I RIOI r 1 0 RI16 FIGURE 16 component Layout PC 291 0471 13...

Page 18: ...COMI 14 1 FIGURE 17 Component Layout PC 290...

Page 19: ...MODEL 427 COMPONENT LAYOUTS FTGURE 18 component Layout PC 289 FIGURE 19 component Layout PC 292 0471 15...

Page 20: ...COMFUNENTL4YOoTS MODEL 427 PC 290 FIGURE 20 Chaaais Top View 16 0471...

Page 21: ...WW ar Wirewound Variable 6 2 ELECTRICAL SCHEMATICS AND DIAGRAMS Schematics and diagrams are included to describe the electrical circuits as discussed in Section 5 Table 6 2 idenc ifies all schematic p...

Page 22: ...erusion Left 1 24754C 6 Side Extrusion Right 1 24754C 7 corner Bracket 2 247458 8 Screw Socket 6 32 x 114 4 9 Screw Phillips 6 32 x l 4 4 10 Clip for Side Dress 2 FA 101 11 Side Dress Panel 2 24755B T...

Page 23: ...MODEL 427 REPLACEABLE PARTS FIGURE 21 Chassis Assembly Exploded View FIGURE 22 Bottom Cover Assemblv 0471...

Page 24: ...C64 SF 19 72982 m 050 C64 5P 19 72982 DD 330 C64 33P 19 72982 m 101 C64 1OOP 19 MISCELLANEOUS Mfr code CPR 15OJ CPR 68OJ CPR 22OOJ CPR 68OOJ 2PJ 223G Mfr Lhsig C138 15OP 19 C138 68OP 19 C138 0022M 19...

Page 25: ...Mfr Mfr Keithley Pig 1000 v 1000 600 V 1000 200 v 200 1000 v CerD 72982 l D 72982 t T 71590 cem 72982 MY 13050 loss D22 C22 0022M 18 801000X5F0102 C64 OOlM 18 TCZ 1R5 c77 1 5P 18 801000 5 0102 C64 ool...

Page 26: ...118 w corn MtF MW MtF 44655 01121 07716 07716 07716 R206 10 ki l 118 W MM 07716 R207 18 2 kn l l 2 w MtF 07716 R208 10 kfi l l S w MtF 07716 R209 12 1 kO l l 8 W MtF 07716 R210 499 n l l S w MtF 07716...

Page 27: ...3 2N5089 X 62 18 04713 2N3903 w 49 18 04713 2N3905 z 53 18 MOTHER BOARD PARTS LIST 300 SERIES PC 290 CAPACITORS Value Rating Type Mfr Mfr Keiehley Fig Code i sig Part NO Ref c301 200 p C302 200 fl c30...

Page 28: ...Pilot lamp neon replacement far 5302 08806 DS 302 C A N 2P PL 58 _ Pilot Lamp O RLOAD 07294 CF03ACS1869 PL 51 2 iESISTORS Located on Switch S303 CirCUFt Mfr Mfr Keithley Value FFg Llesig Rating Type...

Page 29: ...2 w MtF 10 Mn l 1 w DCb 100 MO DCb 109 1 2 w n GCb CEOlOOI R94 look 20 CEOM i R94 1M DC l 1OMn DC 2 100Mo Rx l 1090 hR331 R332 1010 R CCb 63060 Rx l 101On 1011 to f e G 2 il GCb 63060 Rx l 1olln rw dl...

Page 30: ...Calibration 4 Overload Circuit Check 1 Power Supplies a Connect Model 163 between the 15 volt test point and chassis and adjust the f15 volt poten tiometer R309 for 15 Volts t10 Sing the oscilloscope...

Page 31: ...fier QA201 Q203 4204 at location on PC 290 mother baard at jumper found directly below pot entiometers R232 and R233 set the Suppression to 10 amperes and adjust the front mnel pot R333 for a reading...

Page 32: ...output and check the Model 427 BMS output noise for all settings in Table 7 3 10 Filter Rise Time b Adjust the 10 through 1011 ranges within the specified 10 to 90 rise time using the tri angular wav...

Page 33: ...resistor 104 and the square wave fre Set the Oscilloscope for 2V Div and set the Function Generator for 1 volt out of the quency listed check the filter amplifier lo 90 rise time Set the Function Gene...

Page 34: ...V A SUPPRESSION 1O 7 ampere RISE TINE 1 ms POLARITY or c j POLARITY is for setting recorder printer left of zero and for setting printer right of zero a Place a CAP 18 an the Model 427 input and set...

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Page 38: ...ip A I I IT 3 J...

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Page 40: ...ents connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboratory out of doors etc What power line voltage is used Var...

Page 41: ...ing the test setup shown in Figure 24 b Adjust the 109through 101 rangas within the specified lo 90 rise time using the triangular wave frequency and adjustment listed in Table 7 2 Adjust the Function...

Page 42: ...odel 427 Current Amplifier Instruction Manual is being provided in order to supply you with the latest information in the least possible time Please incorporate this information into the manual immedi...

Page 43: ...3G 68460 3FR 663 l E 13050 SMIA 22kF 13050 SMlA 66pF 13050 SMIA 2 2kF 97419 M2WF 6 6pF 71590 CPR 66J 71590 CPR 330J 71590 CPR IOOOJ 71590 CPR 3300J 64171 2PJ 103G 66480 3FR 333 l E 13050 SMIA lkF 1305...

Page 44: ...07716 R204 23 2kn I 1 8W MtF 07716 R205 22 lkn l 1 8W MtF 07716 R206 IOkn I 1 8W MtF 07716 R207 18 2kR l 1 2w MtF 07718 R206 1ok Q I 1 8W MtF 07716 R209 12 lkn I 1 8W MtF 07716 R210 499n I 1 8W MtF 0...

Page 45: ...316 SW 340 SW 339 KN 46 _ TG 54 TG 5 _ TG 49 SW 236 FU 17 FU 20 TR 136 CS 235 co 7 PL 58 PL 51 KN 58 RESISTORS Located on Switch S303 17 17 17 3 3 20 2 17 17 17 3 3 0 3 2 2 Destg VdUe Aatlng TYPO Mfr...

Page 46: ...IIN 5 cc E PIN OF THE OP AMP GOES INTO THE HOLE OF PIN 5 X F PIN 7 OF THE Op AMP GOES INTO THE HOLE OF PIN 3 G FIN 3 OF THE OF GMF GOES INTO THE HOLE OF PIN 10 PIN HOLES 1 7 9 WILL REMAIN EMPTY ON THE...

Page 47: ...MODEL427 4 rR201 201 y C2031 COMPONENT UYOUTS c107 FIGURE 18 component Layout PC 289 FIGURE 19 Component Layout PC 292 15...

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