Keithley 486 User Manual Download

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Summary of Contents for 486

Page 1: ...Model 486 PICOAMMETER Model 487 PlCOAMMETER SOURCE QUICK REFERENCE GUIDE...

Page 2: ...ference guide contains descriptions of vari ous features and information concerning the operation of the Model 4861487 21990 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A Document...

Page 3: ...technologies Hewtett Packard Is a registered trademark of Hewlett Packard Company IBM and AT are registeredtrademarks and PC XT is a trademark of International Business Machines I C PC 488 is a regist...

Page 4: ...ING 24 DATA STORE OPERATION 26 ANALOG OUTPUT 27 TALK ONLY 28 IEEE 488 PROGRAMMING 29 Device dependent Commands 29 Display Intensity 29 Reading Source 29 Zero Check and Correct 29 Display 3 0 V lOhms 3...

Page 5: ...Trigger Status Voltage Source 487 i l 35 Delay Execute 35 a 3 5 Terminator 3 5 Relative 36 Data Formats 36 a SRQ Mask and Serial Poll Byte 40 StatusWords 4 1 a 4...

Page 6: ...nt Before operating the instrument make sure the line cord is connected to a properly grounded power receptacle Exercise extreme caution when a shock hazard is pre sent Lethal voltages may be present...

Page 7: ...uch any object which could provide a current path to the common side of the circuit under test or power line earth ground Do not exceed the maximum signal levels of the instru ment as shown on the rea...

Page 8: ...gger overrun instrument trig gered while still processing a pre vious trigger CAL VALUE Calibration value conflicts with the currently selected range CAL ERROR Calibration value not within allow able...

Page 9: ...current ranges of the Model 4861487 are listed in Table 2 2nA 20nA 200nA 2c1A 20 iA 2oopA 2mA 2 19999inA Higher voltages requirecurrent to be limitedto 3mA 2 19999nA 21 9999nA 219 999nA 2 19999pA 21 9...

Page 10: ...HECK q El CORRECT When zero check is enabled the input amplifier is inter nally disconnected from the input connector of the instru ment A 1OOkGresistor shunts the input connector and the instrument d...

Page 11: ...RECT in that order Filters SHIFT cl Filtering is used to stabilize noisy measurements The Model 486 487 has two available filters a digital filter and an analog filter The digital filter bases the rea...

Page 12: ...ferent filter use the rotary knob or the 4 and b keys to display the desired filter selection Enter the displayed filter selection by pressing SHIFT and then FILTER SELECT Rel REL q 0 The rel relative...

Page 13: ...ent measurements 1 Select a current range that is appropriate for the ex pected measurement or enable autorange press SHIFT and then AUTO RANGE 2 Enable zero check and if the display is not zeroed per...

Page 14: ...Input Connector Max Overload 2nA 2pA Range 35OVdc 2OpA 2mA Range 50 Vdc Chassis Gmund Fiaure 1 Triax InDut Connector 3 Lua Figure 2 Picoammeter Connections Model486...

Page 15: ...N The voltage source may float However neither V Source terminal may ever be more than 500V above chassis V SOURCE OUTPUT 500V MAX TO OR I HI LO 1 5oov MAX Figure 3 Model 487 V Source Output Terminals...

Page 16: ...Model 487 cannot source voltage when the lid of the test fixture is open or ajar Adjusting V Source Level The rotary knob and the4 and keys are used to adjust the V Source level and select range WARNI...

Page 17: ...ed range and level Disable preset by again pressing PRESET Whenever preset is enabled V Source will adjust to the value and range set in step 2 I Limit The V Source has current limit l limit capabilit...

Page 18: ...rotary knob to display the desired l limit value 3 to enter the displayed l limit press MENU Operate 5oov 2mA MAX OPERATE III 0 FLASHES IN I LIMIT The OPERATE key toggles the output between standby an...

Page 19: ...e the rotary knob and the 4 and b keys to set the desired voltage range and level 3 Select the appropriate l limit 25pA or 2 5mA 4 Press Operate 5 To disable the V Source again press OPERATE 3anana r...

Page 20: ...nts 1 2 3 4 5 6 7 8 With zero check enabled and the V Source in standby connect the circuit shown in Figure 5 Select a current range that gives the nearest full scale reading or autorange and perform...

Page 21: ...Figure 5 V I Ohms Connections Source V Measure I 20...

Page 22: ...then EXIT Table 4 MENU items Menu Item 1 Description DATA STORE DATA RECL ILIMIT INTEGRATE IEEE 488 DEFAULTS SELFTEST DEBUG CALIBRATE CAL V SRC Arm data store and set buffer size Recall data stored i...

Page 23: ...Press SETUP to display the setup 2 Use the rotary knob to display the desired option of the setup 3 Press SHIFT and then SETUP to select the dis played setup Trigger Mode Inthe one shot mode a separat...

Page 24: ...t until the unit takes a reading Inthe multiple trigger mode the delay period affects only the first conversion however in the one shot trigger mode the delay period affects every conversion The Model...

Page 25: ...EXTERNAL TRIGGERING EXTERNAL METER TRIGGER COMPLETE INPUT OUTPUT Figure 6 Trigger Connectors Triggerson Figure 7 External Trigger Pulse Specifications 24...

Page 26: ...Figure 8 Meter Complete Specifications 25...

Page 27: ...keys to dis play the desired buffer size value D Press MENU 3 Press TRIGGER to initiate storage Recalling Data 1 Press MENU until data recall is selected and use the rotary knob to display the followi...

Page 28: ...ANALOG OUTPUT The Model 4861487 has a non inverting analog output For a 200 000 count input the analog output will be 2V 27...

Page 29: ...ce whenever a measurement conversion occurs To place the Model 4861487in talk only 1 Press and release MENU until the present IEEE 488 selection is displayed 2 Use the rotary knob to display talk only...

Page 30: ...Source Readings from A D Single reading Fromdata store All readings from data store Maximum reading from data store Minimum reading from data store Zero Check and Correct Disable zero check Enable zer...

Page 31: ...x ASCII rdgs and buffer locations with prefix ASCII rdgs and buffer locations without prefix Binary rdgs IEEE Std 754 single preci sion bytes reversed for Intel CPUs Binary rdgs IEEE Std 754 single pr...

Page 32: ...Hi1 Hit TRIGGER key H12 Hit OPERATE key 487 H13 FtESET key 487 Hi4 HI5 Hit H16 R Hit otary Knob counterclockwise Hi7 Hit Rotary Knob clockwise Self Test Perform ROM RAM self test Perform disalav and R...

Page 33: ...nge using v v 2mA to 2mA Calibrate zero on present voltage source range Model 487 only Calibrate full scale on present voltage source range Model 487 only Prepare to calibrate present voltage source r...

Page 34: ...digital filter enable analog filter Enable digital and analog flters I Range Enable autorange Select 2nA range Select 20nA range Select 200nA range Select 2juI range Select 2OpArange Select 200pA rang...

Page 35: ...ne shot on X Multiple on External Trigger One shot on External Trigger Multiple on Operate 487 One shot on Operate 487 Status Send machine status word Send error status word Send model number and firm...

Page 36: ...voltage source level n in volts range r and limit I n 505 to 505 r 0 50V range 1 500V range I 0 2OuAlimit 1 2mA limit i Delav Wn Delay trigger n Execute X Executeother device dependent com mands Term...

Page 37: ...ing present reading as baseline z2 V Enable relative using V as baseline v 2mA to 2mA for current On to 50 5PR for V I ohms 23 Enable relative using the baseline previ ously defined Data Formats Finur...

Page 38: ...gle preciston IEEE 75 4 G4 Format Reverse mier lnlel CPU Fleading bytes sem in reverse order i leader Byte 4 Byte 3 Byte 2 Byte 1 Headers Rr IJmG4 and G5 fcxmak are shown in FQ 4 4 When remllinp data...

Page 39: ...wslMSBI ILSBIMSBI 1 1 LSB VExpdnarn Headers for the G6 and G7 formats are shown in Fig 4 4 When recalling data from the buffer one header is followed by one or more readings dependiw on buffer e NME T...

Page 40: ...G5 and 07 Header 6 bytes Figure 12 Headers for Binary Formats 39...

Page 41: ......

Page 42: ...RRECT C O Zero check disabled I Zero check enabled VII OHMS F 0 W Ohms disabled 1 W Ohms enabled DATA FORMAT G O Rdgwith prefix ASCII 1 Rdg without prefix ASCII 2 Rdg and buffer location with prefix A...

Page 43: ...f SRQ M OOO Disabled OOI Reading overflow 002 Data Store Full SRQ M cant 004 Data Store l 2 Full 008 Reading Done 01G Ready 032 Error 128 Voltage Source Error DATA STORE SIZE N OOO Wrap around nnn OOi...

Page 44: ...e shot on External Trigger 8 Multiple on Operate S One shot on Operate VOLTAGE SOURCE vmn m 0 50V range 1 5OOVrange n O 25pA Limit 1 2 5mA Limit Ei llFATOR Y P 1 LFCR 2 R 3 LF 4 None RELATIVE Zm or Zm...

Page 45: ......

Page 46: ...tion Value e g CV O OOOOOE O5A U4 Trigger Interval 8 g TI 001 236E OOS U5 Trigger Delay e g TD 002 000E OOS U6 Relative Value Current e g RV 1 00000E O3A U7 Relative Value V I Ohms 8 g RV l 00000E 020...

Page 47: ...U9 Voltage Source Error Status 467 O I O l LL 1 Interlock Open 1 Current Limited Figure 17 U9 Voltage Source Error Status Word 46...

Page 48: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printedin the U S A...

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