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Keithley 224, Instruction Manual, Page: 42 / 75

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Page 1: ...Model 224Programmable Current Source Instruction Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E Advanced Test Equipment Rentals www atecorp com 800 404 ATEC 2832 Established 1981...

Page 2: ...RECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES...

Page 3: ...Model 224 Programmable Current Source Instruction Manual Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Fifth Printing December 2001 Document Number 224 901 01 Rev E...

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Page 5: ...ates that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to expect that hazardous voltage is present in any unknown circuit be...

Page 6: ...components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instru ments Standard fuses with applicable national safety approvals may be use...

Page 7: ...sis isolated connectors for EXTERNAL TRIGGER INPUT and OUTPUT All connections on rear panel IEEE 488 BUS INTERFACE ootion 22431 Multiline Commands DCL LLO SDC GET GTL UNT UNL SPE SPD Uniline Commands...

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Page 9: ...6 2 3 6 Response Time 2 6 2 3 7 General Operating Procedure 2 6 2 3 8 Front Panel Messages 2 7 2 3 9 Examples of Operation 2 7 2 4 Applications 2 12 2 4 1 Calibration 2 12 2 4 2 Resistivity Measuremen...

Page 10: ...1 Disassembly 5 2 FanFilterMaintenance 5 2 Special Handling of Static Sensitive Devices 52 Calibration 5 4 RecommendedTestEquipment 5 4 Environmental Conditions 5 4 Warmup 5 4 Calibration Adjustments...

Page 11: ...terization 2 13 2 13 Diode Curves 2 13 2 14 Low Resistance Measurement Connections 2 14 3 1 100mA to 1mA Range Verification 3 2 4 1 Analog Circuitry Block Diagram 4 3 4 2 Digital Circuitry Block Diagr...

Page 12: ...Verification FuseReplacement 3AG Size FuseReplacement 5mmSize LineVoltageSelection Model 224 Static Sensitive Devices RecommendedTestEquipment Model224Calibration PowerSupplyChecks Analog BoardChecks...

Page 13: ...ws guarded applications to be com pleted l Selectable auto rate TIME of 50msec to 999 9sec aCANCEL button that momentarily blanks the display and terminates the data modifying operation I LIMIT functi...

Page 14: ...rd IEEE 488 1978 protocol Additionally the Model 2243 incorporates a separate digital I O port that may be used to interface the Model 224 to other digital instrumentation Model 6011 Triax Input Cable...

Page 15: ...operative display segments by comparing the Model 224 s display with the above figure B In addition the pushbutton and the TALK LISTEN and REMOTE indicators will light All indicators will light simult...

Page 16: ...o 3V HI Limit set to 0 000 LO Limit set to 0 000 Time Set to 50msec 50 00 3 Digit Set to inactive INCR Set to inactive INCR LED is off DECR Set to inactive DECR LED is off Cancel Set to inactive Enter...

Page 17: ...on is pressed when the cur sor is on the next to least significant digit In the manual mode each time the button is pressed the selected digit is in cremented by one count In the auto mode the selecte...

Page 18: ...f greater than lO ec when the selected digit has been incremented or decremented Refer to Figure 2 5 for pulse specifications FUSE This is the line power fuse and it is rated as listed in Table 5 l LI...

Page 19: ...S AMPS SECONDS V LIMIT I LIMIT TIME 7 4 1 0 8 5 2 9 6 3 LISTEN REMOTE SH1 AH1 TE TEO L4 LEO SR1 RL1 PP0 DC1 CO E1 1 0 A1 IEEE 488 INTERFACE EXTERNAL TRIGGER DIGITAL I O INPUT OUTPUT FUSE SLOWBLOW 3 4A...

Page 20: ...put reaching to within 0 1 of the programmed value The ac tuation of the OUTPUT function could be from an external trigger pulse or by pressing the OPERATE button on the front panel The actual time di...

Page 21: ...e messages appear throughout the operation of the Model 224 and are listed in Table 2 5 2 3 9 Examples of Operation The following examples present several operating methods and variations Example 1 Ou...

Page 22: ...electing auto time of less than 50 00 3sec or greater than 999 9sec Selecting l limit that is less than 101 OO 3A or greater than 101 OO 3A Selecting V limit that is less than 1V or greater than 105V...

Page 23: ...Model 224 is auto incrementing decrementing stops the auto increment decrement action Pressing AUTO again resumes the operation 8 Decrementing a value lower or higher than the present current range c...

Page 24: ...on the TRIG LED Pressing the button again disables the external trigger operation and turns off the TRIG LED 2 The TRIG and the AUTO functions are mutually exclusive 3 The DIGIT button must be activat...

Page 25: ...hen pressing the PRGM and TRIG in se quence would toggle the Model 195A into an alternate trigger mode Consult the Model 195A Instruction Manual for complete details concern ing the trigger mode MODEL...

Page 26: ...ly be programmed for this applica tion If desired the Model 224 can be manually set to output a value of current that is required for a particular application calibration Automatic calibration can be...

Page 27: ...current voltage characteristics of a diode over ly Figure 2 13 shows several examples of diodes whose several decades Figure 2 12 shows the configuration to be curves have been plotted using the confi...

Page 28: ...essed the second time the LO limit message is displayed the LO limit of the current limit is displayed and the I LIMIT LED is turned on At this time the LO l limit may be modified by the procedure giv...

Page 29: ...n in Figure 2 5 Depending on the mode auto manual the pulse triggers the instrument to incre ment decrement the selected digit source value upon receiving the pulse This is a female BNC connector This...

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Page 31: ...PROCEDURE Use the following procedure to verify the accuracy of the Model 224 If the Model 224 is out of specification proceed to Section 5 Maintenance unless the Model 224 is under war ranty In that...

Page 32: ...utput 100 00 6A with a 20V compliance limit 4 Verify the reading on the Model 192 to be between 10 016 and 9 984V 5 Program the Model 224 to standby press OPERATE 6 Select the 2VDC range on the Model...

Page 33: ...o the amplifier input The amplifier input to the com mon of the high voltage supplies of Q318 Q319 output com mon comprised a current source Range resistors R375 R376 R377 R379 R380 R381 and R383 alon...

Page 34: ...an overall block diagram of the digital circuitry refer to Figure 4 2 The microcomputer and its associated logic circuitry controls front panel functions source time auto etc operation of the front p...

Page 35: ...E REGISTER I I I I__ ____ ___ __ _ _ I I I OUTPUT 6 I CONTROL I I 0 I I 1 I OUTPUT TRIAXIAL RECEPTACLE POWER SUPPLY 9 3J DIGITAL COMMON I ELECTROMETER OP AMP DIGITAL CONTROL 1 GUARD OUTPUT COMMON CHAS...

Page 36: ...u102 Ullll U106 U1071 CRYSTAL TIME BASE IYlOll c r CONTROL TO ANALOG CIRCUITRY FRONT PANEL DISPLAY AND PUSHBUTTON FOR DETAILED INFORMATION ON THE IEEE 488 INTERFACE REFER TO THE 224 PROGRAMMING MANUA...

Page 37: ...ACCESSABLE NOT ACCESSABLE 110 FUNCTION RANDOM ACCESS MEMORY UlOl AND UlOS RANDOM ACCESS MEMORY U103 AND U107 DATA BUFFER U112 VERSATILE INTERFACE ADAPTER Ul14 SWITCH BUFFER FROM FRONT PANEL Ull6 IEEE...

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Page 39: ...TION Do not install a fuse with a higher rating than specified in Table 5 l or 5 2 Instru ment damage may result 4 To install the fuse and carrier into the holder reverse the procedure in step 2 Table...

Page 40: ...the four plastic standoffs B Remove the two phillips screws that secure the mother board to the case They are located at the rear of the mother board one by the fan and the other is by the line volta...

Page 41: ...ALOG BOARD SHIELD 331 CABLE AMP MOTHER BOARD FEET 4 Required NOT SHOWN I FE 14 BOTTOM COVER 220 302 4 Required 31843 1 BUITON 1 Required rlLT BAIL ON OFF 30544 TRINi INSERT 294855 31470 4 NOT SHOWN NO...

Page 42: ...mbient temperature of 23OC l C and a relative humidity of less than 50 5 7 3 Warm Up The Model 224 must be turned on and allowed one hour for warm up If the instrument has been subjected to extremes o...

Page 43: ...ways be the first item on the list of any troubleshooting Refer to Table 5 8 for analog board checks Refer to Table 5 9 for digital circuitry checks Re fer to Table 5 l 0 for display board checks NOTE...

Page 44: ...operly rated FlOl has continuity Line selected switch S102 verified in correct position 0319 Collector 130VDC f 15 125V Supply Q318 Collector 130VDC f 15 125V Supply VR301 Input 15VDC 15 15v supply VR...

Page 45: ...15 0 7v lV ImA range relay is energized Program the Model 224 to output 100p A 5 U320 pin 15 O N lV lOOpA range relay is energized Program the Model 224 to output lOpA i 6 IU320 pin 15 0 7v lV lOpA r...

Page 46: ...h 5 8 1 Digital Self Test IMHz Clock Reset Line Strobe for display board Clock input for Display Board IRQ Line Digital Self Test 8 U117 pin 6 Referenced to Analog Common Data Out Line Analog Side lrn...

Page 47: ...ic Mother Board Schematic Analog Board Schematic i 6 3 ORDERING INFORMATION To place an order or to obtain information concerning replacement parts contact your Keithley representative or the factory...

Page 48: ...S 254 BU 19 BNC CONNECTOR cs 249 2 FH 25 FOR 3AG SIZE FH 28 FOR 5mm SIZE IGiN BP 116 FILTER SUPPORT ASSEMBLY 228 313 IEEE COVER N LE OwN NOTE Mechanical parts that are replaceable show the appropriate...

Page 49: ...V Ceramic Disc Rectifier Bridge 5A PE05 Rectifier 1N4006 Rectifier 1N4006 Rectifier 1N4006 Rectifier 1N4006 Rectifier 1N4006 Rectifier 1N4006 Rectifier Bridge 1 5A PF 40 Rectifier 1N4006 Rectifier 1N4...

Page 50: ...d 2 In NOR Gate 74LSO2 Erasable Prom 2732 DecoderlDemultiplexer 74LS138 Erasable Prom 2732 8 bit Shift Register 14094 Quad Exclusive OR Gate 7486 Interface Adapter SY6522 Microprocessor MC6808 Bus Dri...

Page 51: ...Transistor 2N4355 Thick Film Resistor Network Thick Film Resistor Network Pushbutton Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch...

Page 52: ...n Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch MOS to LED Segment Driver 75492 MOS to LED Segment Driver 75492 B bit Shift Register 74LS164 MOS to LED Seament Driver 75492 Location Kei...

Page 53: ...Aluminum Electrolytic OlpF 5OOV Ceramic Disc OlaF 5OOV Ceramic Disc 1 5pF 25V Aluminum Electrolytic Diode Germanium 1N3592 Silicon Diode 1N914 Silicon Diode 1N914 Diode Dual Low Leakage 10101 Rectifie...

Page 54: ...llW Thick Film Resistor Dl C2 TF 103 4 R312 lOk 5 1 4W Composition Dl R 7610k R313 1k 5 1 4W Composition E D2 R 76lk R314 20k 5 1 4W Composition c4 D2 R 7620k R315 2 2k 5Oh 1 4W Composition G3 D2 R 7...

Page 55: ...E5 R 76 2 2k R372 130 1 1 8W Metal Film Gl F5 R 88 13 R373 IOQ I O l2W Metal Film Gl F5 R 88 10 R374 4 7k 5 1 4W Composition E2 E5 R 76 4 7k R375 54 lk I IIIOW Metal Film F3 D5 R 263 54 1 k R376 4 93k...

Page 56: ...or LM339 SEV B3 IC 219 u314 Quad 2 Input NAND 4011 SEV c3 IC 102 u315 Operational Amplifier AD3247 84 c3 G 77 U316 Hex Inverter 16 Pin 4049 SEV D3 IC 106 u317 Quad Comparator LM339 SEV C3 IC 219 U318...

Page 57: ...AMAI huM I 0 DS211 9DS212 aDS213 aDS214 oDS215 oDS216 aDS217 5217 I 5218 1 S219 11 SCHEM RT No CC C 1 ZONE 1 1 ITEM 1 FART NO 1 OS2 3 03 23 MK Z IZEab c IGZ I I I I r L L7 Figure 6 2 Display Board Com...

Page 58: ...ISLSI I5 USE WI01 LT 043 INSTALL BETWEEN 3 TIOI ISTRl86 X BrniLLlr Lilu 4Jl 7 m HEA SCREW C NNECT HITE BROWN 7 DCnlrlDrn TO POINT x COMPONENT t AYOUl IM t CeN A MCI HER BMHD Figure 6 3 Mother Board Co...

Page 59: ...ON SUBSTITUTE FL 50 AND FU 51 FOR FU 4 ANC FU I AL3 UI STITUTE FH ZC FOR FH 25 SOFTWARE SELECTION TABLE L n iTEM SCHEMATIC MODEL 220 M DESIGNATION MODEL 230 MODEL 224 USAGE USAGE USAGE 105 LJIW 220 8...

Page 60: ...I B C D 4 E I F G H 1 2 3 4 5 6 1 47 i c317 NOTE DO OF NOT STRESS LEADS CR305 AND 07306 Figure 8 4 Analog Board Component Location Drawing Dwg No 224 120 sheet 1 of 2 8 17 8 18...

Page 61: ...Figure 6 4 Analog Board Componet Location Drawing Dwg No 224120 sheet 2 of 21 6 1919 20...

Page 62: ...E DSZII uzozc COPY _ OPERATE B 5 4 PO f X2 I U2028 8 _ 3E 215 I 31 41 51 61 I01 III I21 I31 QA QB 1 Q QE QF QG QH U203 SHIFT REGISTER XFONENT ENTER _ RZOIA Go ZOIG I50 201s I50 5 l2OlF IM 9QZC DATA DA...

Page 63: ...L COMMON _ b 6 c4 d 2 e P f9 9 0 I dP dp dp dp 3 5 3 5 3 5 3 5 tnnrn IT 1 I DECR DS219 LISTEN OS203 r nT c I A I I Tkk t i I I I I III I I I _ I _ I I I I I A A A r U2Ol U2OlE s 1 v RZOIA RZOID iR20lC...

Page 64: ...SPLAY i3OARD 5V pBo 4J1004 I 1 2 3 4 RN4GI D6 07 RS3 RS2 RSI RSO 5v P I I llI I PB4 I4 I JIII I I 1I J6 1 II I Ul13 lJll7 I8 20 CE OE DO 6 UlO8 3 2 P N C A5 21 14L W A5 2114L W Figure 6 6 Mother Board...

Page 65: ...r 2J J y Frw L J L J TY I I...

Page 66: ...n I I I I I I I I It I I I I k HIIIlI u l T in T 0 i _ b T I I m I I...

Page 67: ...LOHMS H MEGOHMS G GIGOHMS U32OD EN 2 ALL CAPACITOR VALUES ARE IN MICROFARADS UNLESS OTHFRWISE MARKEDcpF PICOFARAOS 3 DENOTES OUTPUT COMMON 4q DENOTES ANALOG COMMON h DENOTES CHASSIS CONNECTION DENOTES...

Page 68: ...le a Overload a Unable to zero a Will not read applied input m Calibration only Data required m Certificate of calibration required attach any additional sheets as necessary Show a block diagram of yo...

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Page 70: ...0 2 Research Development 0 Y Mixed Signal Components q S Safety Manager 0 2 Other Discrete Manufacturing 0 9 Service Repair q 0 Optoelectronic Components 0 E System EngineeringRnlegration 0 I Process...

Page 71: ...lI SS3NISf M S31VlS a31lNf l 3Hl NI a3ilvw rli AIVSS333N 33VlSOdON 1 What other Keithley products do you currently use 2 What effects devices or phenomena do you measure with this instrument 3 What wa...

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Page 75: ...Landsberger Strasse 65 D 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Keithley Instruments Ltd The Minster 58 Portman Road Reading Berkshire RG30 1EA 0118 9 57 56 66 Fax 0118 9 5...

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