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Keithley 225, Инструкция по эксплуатации, Страница: 25 / 38

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Страница 1: ...Instruction Manual Model 225 Current Source Publication Date August 1976 Keithley Instruments Inc Cleveland Ohio U S A Document Nufnber 29039...

Страница 2: ...east 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting from product modification without Keithley s express written consent or misuse of any product or part This warrant...

Страница 3: ...CONTENTS MODEL 225 CONTENTS SP CIFICATIONS 1 GENERAL DESCRIPTION 2 OPERATION 3 CIRCUIT DESCRIPTION 4 ACCESSORIES 5 SER ICING lj CALIBRATION 7 REPLACEABLE PARTS SCH rIC 1 2 4 8 10 11 12 19 31 ii 3...

Страница 4: ...pply 6 10 Volt Limit Characteristic 7 11 Modulation 7 12 Block Diagram 8 13 Component Layout PC 227 Switch Board 13 14 Component Layauc PC 228 Mother Board 13 15 Component Layout Switch 5101 14 16 Cha...

Страница 5: ...current dial seteings and or Voltage Compliance This will ensure that no transient currente will be generated WARNING This insrrument is no approved for use in hazardous locations as defined in the Na...

Страница 6: ...reasonably constant ambient tern perature NOISE Less than 0 01 rms of full rangeabove 5 HZ LOADREGULATION t0 005 offullrangefrom no load to full load on the lo to 10 6 am pere range 50 05 on the lo am...

Страница 7: ...O5 Selects positive or negative polarity or standby pasitio 2 4 b VOLTAGE COMPLIANCE Control Sets the maximum compliance voltage which can be developed 2 4 c R117 at the OUT terminal LIMIT Indicator D...

Страница 8: ...MODEL225 GENERAL DESCRIPTION 0571 3 8...

Страница 9: ...e selected The FINE current control must be set to 0 position to obtain the stated accuracies Since the total accuracy of the Model 225 is the s of the readina accuracy and the full a accuracy the use...

Страница 10: ...anel concrok in paragraph 2 4 before power is turned on 2 4 FRONTPANELCONTROLS a Power Switch S2022 This switch controls the line power to the instrument b OUTPUTSELECTOR Switch SlO5 This switch has f...

Страница 11: ...d RL is the load resistance b Constant Current Mode Tbe Model 225 will de liver the dialed current for resistive capacitive and inductive loads unless the voltage required at the output terminals exce...

Страница 12: ...om 50 CD 100 Hz decreasing to about 8 of full range at 500 Hz with a 10 volt rms sine wave input The modulation circuit is not calibrated so that the user m st check with a knwn load resistance Within...

Страница 13: ...esistor is selected by the RANGE Switch for currents of 10 7 ta 10 l ampere full w The remaining power supplies are used to bias the operational amplifiers and reference zener 3 3 CIRCUITRY a High Gai...

Страница 14: ...vol 35 watts Tran sistors Q103 and 9106 are c rrent limiting transistors which shut down the output transistors during a change in the selected polarity h Range Resistor Controls The Range Switch SlOl...

Страница 15: ...Rack Mounting Kit Description The Model 1004 is a rack mounting kit with overall dimensions 5 l 2 inches high x 19 inches wide x 10 inches deep Application The Model 1004 converts the instrument from...

Страница 16: ...or repaired contact a Keithley rep resentative or the Sales Service Department Cleveland Ohio TABLE 5 1 Test Equipment Code Manufacturer Letter Instrument Type Specification and Model No Use A Multim...

Страница 17: ...MPLIANCE to 100 Set FINE to 0 calibrated position 100 mA Range Set decade dials to 9 9 9 Set range to 100 mA Set OUTPUI to Measure current Repeat for OUTPUT 10 18 4 Range Set decade dials to 9 9 9 Set...

Страница 18: ...DBY Set decade dials to 9 9 9 Set FINE to 0 Set range to 100 mA Set COMPLIANCE to 100 Connect load resistor Set ODTPlrr to Measure cm noise using Voltmeter D Repeat for ODTPUT Set range to 100 mA Set...

Страница 19: ...test points shown in Figure 16 Adjust potentiometer R144 for zero Set range to mA Set decade dials to 9 9 9 Set FINE to 10 Set OUT PUT to STANDBY set COMPLIANCE to 100 connect Digital Voltmeter A bet...

Страница 20: ...et decade dials to 9 9 9 set FINE to 10 set COMPLIANCE to 10 Set OUTPUTto STANDBY Connect Oscilloscope E to OUT Oscilloscope settings 2mVldiv SmS div Trigger INTERNAL Input AC COWLED Connect load resi...

Страница 21: ...18 Regulation Check I I ILLOSCOPE OSCILLOScOPE MILLATOR osc XIVPP L 225 OUT 0 OUTPUT 225 IOOHz A00 IS40 OF F S J P OUTFUT ImnY PP m A 07 m FIGURE 19 Modulation Check FIGURE20 Inductive Load Check FIGU...

Страница 22: ...ner COpperweld V VOlL watt mi Wirewound War Wirewound Variable 7 2 ELECTRICALSCHEMATICS ANDDIAGRAMS Schematics Sales Service Department KeithLey Instruments Inc and diagrams are included to describe t...

Страница 23: ...218 22 11 Front Panel 1 2339 Top Cover Assembly 245630 22 12 Cover Sheet Metal 1 24561D 13 screws 4 _ Handle Assembly _ __ 14 Handle 1 m 18 15 Screws 86 32 x 3 S R H Slotted 2 _ Bottom Cover Assembly...

Страница 24: ...MODEL225 REPlACEABLE PARTS FIGURE22 Top Cover Assembly 0571 Botkm Cover Assembly 24 21...

Страница 25: ...2 5106 Receptacle BNC Rear Panel OLPP nil ii UG 1094kl 02660 31 221 cs 15 2 J105 Receptacle SNC Front Panel LOW Mil No UG 1094 U 02660 31 221 cs 15 2 J201 Binding Post GROUND 58474 DF21BC BP 118 2 520...

Страница 26: ...8 2 PL 47 2 PL 47 2 PL 47 2 FU 17 2 FU 20 2 FH 3 2 co 5 2 cc 4 2 IC 14 2 IC 13 2 TR 125 2 TR 124 2 TRANSISTORS circuit Mfr Mfr Keithley Fig Desig Code Desig Part No Ref 80164 04713 9103 07263 Q106 047...

Страница 27: ...kR l l 8 W MCF 07716 136 100 kl l l 8 W MtF 07716 R137 499 n 1 l 8 w RF 07716 R138 500 n l l 2 W ar 71450 R139 95 3 n l I 2 w MtF 07716 R140 100 n lo l 2 w camp 01121 R141 R142 R143 RI44 R145 182 k0...

Страница 28: ...l 2 w lo l 2 W MtF 07716 CEC R94 40 2 MtF 07716 CEC R94 40 2 MtF 07716 CEC R94 40 2 MtF l lee MfF MtF MtF MtF MtF MtF MtF MfF MtF MCF MCF MtF MtF MW MW MtF MW MtF MtF lee MtF MtF MfF MtF ww ar MtF ww...

Страница 29: ...witch Rotary Switch less components second Decade Switch Knob Assembly second Decade Switch Rotary Switch less components third Decade Switch Knob Assembly third Decade Switch Rotary Swifch DDTPDTSELE...

Страница 30: ...982 ED 150 C219 470 pF 1ooov tern 71590 DD 471 Cll7 5M 14 C22 OOlM 14 czz OOlM 14 Cl83 14OM 14 C183 140M 14 Cl50 1OOM 14 c150 IOOM 14 c22 OOlM 14 c22 OOlM 14 Cl50 100M 14 Cl79 4 7M c22 LOOP C22 02M c1...

Страница 31: ...w MtF MtP MtF Comp Camp ComP 71450 07716 07716 07716 01121 01121 01121 C0Uip Comp hw camp camp ww camp camp C0mp Come 01121 ES Rl 4 7k 14 01121 EL3 Rl 6 8k 14 54294 SP23DlS R6L2k RF Il Jx 14 01121 E8...

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Страница 35: ...1 P G I P e...

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Страница 37: ...t I L I I I I I I I I I I I I I I I I O I I n I I 1 I I 0 I 7 I i...

Страница 38: ...ts connected whether power is turned on or not Also describe signal source Where is the measurement being performed factory controlled laboraton out of doors etc 1 What power line voltage is used Vari...

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