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Keithley 595, Quick Reference Manual, Page: 26 / 70

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Summary of Contents for 595

Page 1: ...5 Quasistatic CV Meter e Guide A S U R E O F C O N F I D E N C E...

Page 2: ...Model 595 up and running on the bus The Model 595 QuasistaticCV Meter measurescapacitance usinga uniquefeedback charge method This method cor rects capacitance readings for background leakagecurrent A...

Page 3: ...D SPECIFICATIONS 3 MODEL 595 FEATURES 7 20 FRONT PANEL PROGRAMS 21 26 MEASUREMENT CONNECTIONS 29 34 IEEE PROGRAMMING 35 49 PROGRAMS 50 IBM PC or XT 51 Applell 53 H P 8 5 55 HP9816 57 HP9825A 59 DEC E...

Page 4: ...0 6 2 9 000nA Exclusive of noise for Step V 2 0 05V and Delay Time 5 one second CURRENT Temperature Accuracy Coefficient Reso 1 Bar 18 28OC 0 18OC 28 4OoC Range lution rdg counts f rdg counts l C 20p...

Page 5: ...1 gain 1000 display counts on X10 gain source output GENERAL MAXIMUM INPUT 30V peak DC to 60Hz sine wave MAXIMUMCOMMONMODEVOLTAGE 30V maximum DC to 60Hz sine wave ENVIRONMENT Operating Oo to 4OoC rela...

Page 6: ...for ensuringt h a tthe equipmentis operatedw i t h its specifcationsand operating l i m i t s andfor ensuringt h a toperatorsareadeqately trained Operators use the product for its intended function T...

Page 7: ...r o m electric shock a all times The responsible body must ensure that operators areprevented access and or insulated f r o m every connection point In some cases connections must be ex posed to pote...

Page 8: ...he equipmentmay he impaired Donot exceedthemaximum signallevelsof theinstruments and accessories as definedin the specificationsand operat ing information and as shown onthe instrumentor test fix t u...

Page 9: ...ble nationalsafetyapprovals maybe usedif the ratingand type are the same Other componentsthat are not safety related may be purchased from other suppliers as long as they are equivalent to the origina...

Page 10: ...mation 3 Do not touch any terminals while the instrument is turned on or connected to any test equipment WARNING The maximumcommonmodeinputvoltage the voltage betweeninput low and chassisground is 30V...

Page 11: ...el SHIFT then I Bus Error Instrument programmed while not in remote or illegal command or com mand option sent Number Error Calibration voltage source waveform parameter or program value beyond allowa...

Page 12: ...func tion These functions are labeled in yellow as is the SHIFT button Secondary functions are selected by first pressing the SHIFT buttonand then pressing the desired feature but ton More information...

Page 13: ...GE I SUPPRESS ZERO CHECK CORR I ClCo STORE Co MEASUREMENT FUNCTIONS CURRENT The CURRENT button places the Model 595 inthe current measurement function Any one of eight ranges 20pA to 200pA may be used...

Page 14: ...The CAPACITANCE button places the Model 595 in the capacitance measurement function There are three capacitance ranges 20nF 2nF and 200pF OPERATION 1 Enable ZERO CHECK 2 Press CAPAClTANCE button 3 Sel...

Page 15: ...citance without losingthe stored value OPERATION 1 Select desired function and range 2 Input the offset or baseline level to the Model 595 3 Press the SUPPRESS button The SUPPRESS indicator 4 SUPPRESS...

Page 16: ...ge press the RANGE A button 2 T o downrange press the RANGE V button ZERO CHECK and CORRect Zero check is used to protect the input amplifier of the Model 595 from overloads and switching transients w...

Page 17: ...ight is on The Model 595 input amplifier is now configured to read its own internaloffset 3 Press SHIFT then CORRect to zero correct the instru ment Note that if zero check was not enabled the zero co...

Page 18: ...X I LIMIT LIMIT PRESET The A V LIMIT buttons set the maximum and minimum voltagesthat the voltage source will output to protect the device under test from destructive voltagelevels On power up the lim...

Page 19: ...waveform is selected The step size may be O OlV O O2V O OSV or kO 1OV When plotting a curve step V can be set so that the curve contains the desired number of samples the larger the step size the few...

Page 20: ...elay time 0 07sec to 199 99sec is used to allow the device under test to respond to the change in step voltage before the measurement Delay time is important when performing capacitance and CV measure...

Page 21: ...ce Measurement OPERATION 1 Pressthe DELAYTIME buttonto view present delay time 2 PressADJUST A or Ibuttonto increment or decrement the time On power up delay time is set to 0 07sec ADJUST A V The volt...

Page 22: ...put voltage On power up the Model 595 is programmed for 0 OOV The indicator light will flash when the output current ex ceeds 2mA The current limit will prevent the output cur rent from exceeding 4mA...

Page 23: ...The SELECT A T buttons are used to select the voltage waveform OFF 0 OV OFF sets the voltage source to 0 OOV cO OlV This can be used to set the voltage source to zero without having to use the ADJUST...

Page 24: ...is necessary to measure capacitance STEP The STEP waveform is the fundamental signal requiredfor capacitance measurements Two STEP waveforms are available square wave and staircase The instrumentpower...

Page 25: ...y press ingthe MENUbutton Every time the MENUbutton is press ed a differentprogramwill bedisplayed Programparameters are changed with the voltage source ADJUST buttons Exit the programmode and store t...

Page 26: ...5 is its digital calibra tion program This program does not normally appear in the menu Refer to Section 8 of the Model 595 Instruction Manual for detailed information about the calibration program Fi...

Page 27: ...ger the Model 595 to take a measurement on either a one shot or con tinuous basis OPERATION 1 Pressthe MENUbutton untilthe message triG appears 2 Press either voltage source ADJUST button until the di...

Page 28: ...n toggle gain between X1 and X10 program Note that the instrument always powers up in XI gain Corrected Capacitance The corrected capacitance program uses the Q t measure ment to cancel the effects of...

Page 29: ...488 Address This program is used to display or changethe IEEE 488ad dress The Model 595 is set to address 28 at the factory The following addresses or codes may be used with the Model 595 Address 0 3...

Page 30: ...buttons to toggle the display between the alpha and numeric functions 3 T o store the selection and leavethe program press SHIFT then EXIT Note that the display mode selected is stored in permanent m...

Page 31: ...noperable while the grid is being drawn Y HI Y LO The Y HI Y Lo programs are used to set the upper and lower plot limits of the Y axis The limits range between k2 0 in 0 1 increments with 2 0 correspo...

Page 32: ...input HI outer conductor is GUARD VOLTAGE SOURCE OUTPUT Isolated BNC connector In ner conductor is output H I outer conductor is GUARD Voltage is sourced from this output to bias devices when making c...

Page 33: ...lated BNC connector pro vides negative going TTL output pulse after a reading is completed Referenced to IEEE common EXTERNAL TRIGGER INPUT Isolated BNC connector Negative edge triggered TTL level Ref...

Page 34: ...ow noise cables when making measurements with the Model 595 A typical capacitancemeasurement can be made with the test set up illustrated in Figure 2 which shows a packaged capacitor in a test box MEA...

Page 35: ...Figure 3 to see how to makecurrent measurement connections The set up in Figure 3 shows connections made with the Model 595s voltage source METAL TEST BOX Figure 3 Typical Current Measurement Connect...

Page 36: ...Model 595 andthe last column describes the results of the action taken In this example the device under test DUT has a value of about 500pF The initial measurement configuration is power OFF with con...

Page 37: ...value of D U T minus fixture strays ZERO CHECK off to resume measurement This value is stored as Co for normaliza tion of capacitance The measured capacitance is nor malized to Co The magnitude of cur...

Page 38: ...ly disconnectedat the test box on the voltage source output side Button Press DisDlav Remarks 1 POWER r r r 0 0 000 nF 2 CURRENT 0002 nA 3 RANGE V 0 002 pA presstwice CORR 4 SHIFT then 0 000 pA 5 RANG...

Page 39: ...00 V Adjust voltage 9 DISPLAY OOOO FA Return unit to meter SOURCE sourced source to 1V out SOURCE display display 10 ZERO CHECK 9835 LA Read value from This value depends on the resistor under test l...

Page 40: ...METER COMMANDS FO F1 Display DO I Meter Capacitance Current Voltage source High limit of voltage source Low limit of voltage source D4 Step voltage D5 Delay time R l R 2 R3 R 4 R5 R6 R7 R8 Capacitanc...

Page 41: ...n H20 Filter Filter off Filter 1 Filter 2 Filter 3 DC measurements Set high limit of voltage source where nn nn 2O OOV to 20 00V VOLTAGE SOURCE COMMANDS I Hiah Limit I Lnn nn IL 20 Set low limit of vo...

Page 42: ...V step 1OOmV step Delay Time Inn nn Set delay time for staircase and square wave where nnn nn 000 07sec to 199 99sec WAVEFORM COMMANDS I Waveform wo Iw 1 w 2 w3 Voltage source off 0 0volts DC output v...

Page 43: ...d not corrected 0 t displayed capacitance not corrected Capacitance displayed capacitance corrected Q t displayed capacitance corrected Preftxes GO G1 G2 G3 G4 G5 G6 G7 TERMINATE ON EACH READING Readi...

Page 44: ...n Pen down X10 gain Same as 04 Triggers TO T l T2 T3 T4 T5 T6 T7 Continuous on Talk One shot on Talk Continuous on GET One shot on GET Continuous on X One shot on X Continuous on External Trigger One...

Page 45: ...do not hold off on X Do not send 01 do not hold off on X I Terminator I Y 4 No terminator STATUS COMMANDS 1 Digital Calibration Annn nnE nn I Calibration value using exponent Self Test and NVRAM Stor...

Page 46: ...Send voltage source level uo u1 u2 u3 u4 u5 If in staircase waveform will change to DC pause Only changing capacitance correction will cause waveform to change to DC NOTE If a measurement is changed t...

Page 47: ...lue DO FO R3 21 NO PO H20 L 20 vo s2 1 07 w 2 co QO GO 00 T6 MO KO YO status Meter Capacitance 20nF 2nA Zero check on Suppress off Filter off High limit 20V Low limit 2OV Zero voltage progammed 50mV s...

Page 48: ...I A G i 018 I 8 C U R R E H I P R E F I X O A I A SIRING MAWIISSA E X P O W E N I REAOIWG o ovEnnAn6E N NORMAL i vaLrmGE 2 2ERO C H E C I IVX CURREW1 Y O L I A G E MEASUREMEW1 I C P L O I l E R F o n...

Page 49: ...SERIAL POLL STATUS BYTE 44...

Page 50: ...OEFAULT CONDITIONS SHOWN ERROR STATUS U I MOOEL NO cPREFIXJ IOOC IOOCO NO REMOTE CONFLICT g NUM6ER SELF TEST 5 I n I O I o I o I o I10 110 0 0 TERM IATA STATUS U2 NO TEMPORARY cAL VOLTAGE SOURCE STOR...

Page 51: ...ay be set to primary addresses 0to 30 and IEEE 488 codes 40 to 43 as long as no 0 t h instrument on the bus is set to the same value To select an IEEE 488 address or code simply pressthe MENU button u...

Page 52: ...y perform the following steps 1 Using the front panel PROGRAM MENU button display the present IEEE 488 address value 2 Using the voltage source ADJUST buttons select one of the following Talk Only par...

Page 53: ...5 before power up and perform the following steps 1 Fromthe front panel set up the Model 595to makestair case measurements capacitance or current First com plete the configuration of the voltage sourc...

Page 54: ...Lo to crop the plot 6 Pressthe SHIFT button then programEXIT The measure ment plot will begin when the staircase is started 7 To pause and restart the plot press SELECT A to pause and SELECT V to cont...

Page 55: ...o the user They are not intendedto suit specific needs Each program is designedto send a device dependentcommand string to the instrument and obtain and display an instru ment reading string Detailed...

Page 56: ...re set the primary address of the Model 595 to 28 3 Type in BASICA on the computer keyboard to get into the IBM interpretive BASIC language 4 Placethe interfacesoftware disk inthe defaultdrive type LO...

Page 57: ...THEN 70 MA BEDO NAB rw35 l descriptor p 1 5 9 5 7 u BF Do O I CMDS See if program is to be halted Check for null input Address 595 to listen send string Def ine reading input buffer Address 595 to ta...

Page 58: ...595 to the IEEE 488 interface installed in the Apple II computer 2 Using the front panel program feature set the primary address of the Model 595 to 28 3 Enterthe linesin the programbelow usingthe RE...

Page 59: ...GOTO 98 End of input if CR 85C CB A Add characters to string Untalk the 595 166 PR B Define output to CRT 118 IN Define input from keyboard 126 PRINT CB Display reading string 13g GOTO 28 Repeat NOTE...

Page 60: ...interface installed in the HP 85 computer 2 Using the front panel program feature set the primary address of the Model 595 to 28 3 Enterthe linesinthe programbelow using the END LINE key after each li...

Page 61: ...48 INPUT k 66 ENTER 728 EB Dimension strings Place 595 in remote Prompt for command Input command string Address 595 to listen send string Address 595 to talk input reading Display reading string Repe...

Page 62: ...installed in the 9816 computer 2 Using the front panel programfeature set the primary address of the Model 595 to 28 3 Type EDIT and press the EXEC key 4 Enter the lines in the program below using the...

Page 63: ...in remote Prompt for and input command Address 595 to listen send string Address 595 to talk input reading Display reading string Repeat NOTE For conversionto a numericvariable changethe pro gram as...

Page 64: ...rface installed in the 9825A 2 From the front panel set the primary address of the Model 595 to 28 3 Enter the lines in the program below using the STORE key after each line Line numbers are automatic...

Page 65: ...remote 2 RE1 l i i 5 35 I 3 ENT COIIMANn STRING FPS Prompt for command string 4 WET i 6 5 35 5 I Bf Address 595 to listen send string 5 R E 1 1 i 5 35 9 Address 595 to talk input data i PFT A 6 Print...

Page 66: ...he program below using the editor under RT 11 4 Compile usingthe FORTRANcompiler as follows FOR 5 Link with the system and IB libraries as follows LINK 6 Type RUN IEEE and press the RETURN key 7 The d...

Page 67: ...low 5 error 15s Allow 1 second bus timeout Set line feed as terminator Turn on remote Input primary address Prompt for command string Program instrument Address 595 to lis ten send string Get data fro...

Page 68: ...to the PETKBM IEEE 488 interface 2 Using the front panel program feature set the primary address of the Model 595 to 28 3 Enter the linesof the program below usingthe RETURN key after each line is typ...

Page 69: ...play reading string Reoeat NOTES 1 If conversionto numericvariable is required modify the program as follows 60 A UAL MID3 A3 5r 14 78 PRINT A SB GOT0 20 2 The PET INPUT statement terminates on a comm...

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