Keithley 595 User Manual Download

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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

Summary of Contents for 595

Page 1: ...Model 595 Quasistatic CV Meter 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...

Page 2: ...DIRECT INDIRECT 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 SU...

Page 3: ...Model 595 Quasistatic CV Meter Instruction Manual 1986 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A November 1986 Second Printing Document Number 595 901 01 Rev B...

Page 4: ...s 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 befor...

Page 5: ...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 6: ...er staircase or squarewave SQUAREWAVE Repeatedly toggles between the programmed voltage and the programmed voltage plus STEP V dwelling at each level for step Time STAIRCASE Repeatedly inuements the o...

Page 7: ...o rated accuracy see manual for recommended pmcedure POWER 105125V or 21 25OV internal switch selected 5OI k to M 15VA max 9 llOV and 18X22OV version available upon request DIMENSIONS WEIGHT l27mm hig...

Page 8: ...least two hours b Repeat as needed every 24 hours or if the ambient temperature changes by more than 1 C 41 NMRR For on range normal mode sine wave inputs only NMRR 20 log peak to peak current input...

Page 9: ...M Test Messages _ __ 2 2 GENERAL DISPLAY MESSAGES 2 2 INSTRUMENT FAMILIARIZATION _ _ __ 2 2 Model595FrontPanel 2 4 Model595RearPanel ______ _ _ _ 2 6 Test Cormxtions for Capacitance and Ctient Measure...

Page 10: ...NTING RESULTS 3 19 3 12 USE OF JXI ER ON CURVES 3 20 3 13 MEASUREMENTCONSID ONS _ _ _ 3 22 3 X3 1 Ground Loops 3 22 3 X3 2 Electrostatic Interferences 3 22 3 13 3 The EMFs 3 23 3 X3 4 RFI 3 23 3 13 5...

Page 11: ...4 10 1 Square Wave Capacitance Measurements 4 48 4 10 2 StaircaseMeasurements 4 48 4 10 3 Cti ntMeasurements 4 49 4 11 TALK ONLY 4 49 4 12 IEEE PLOT 4 49 4 13 BUS DP TZ1TRANSMISSIONTIMES 450 SECTION 5...

Page 12: ...AMPHFIER _ _ PreamplifierConfiguration 1 1 1 InputandGain Stages FeedbackElements _ _ _ _ _ Past Discharge Bridge I Xl0 AMPLIFIER Z __ __ ____ MUITIPLFXER and BUFFERAMFLIFIER 2VREF XF NCESOURCE _ _ I...

Page 13: ...8 8 2 Power UpSeIfTest 8 18 8 8 3 Self DiagnosticProgram 818 8 8 4 Power Supply Checks _ ___ _ _ 8 19 8 85 AIDConverterChecks _ 8 19 8 8 6 Voltage Source Checks _ __ 8 19 8 8 7 Relay Configuration 8...

Page 14: ...Bus Hold Off Ties ____ _ 438 Trigger to Reading Ready Iiies in Ksec I 450 SECTION B PERFORMANCE VERIFICATION 2 Recommended Test Equipment for Performance Verification 6 2 Liits for Current Verificati...

Page 15: ...2 Display Board Parts List 9 15 Preamp Board Parts List I _ 9 21 Miscellaneous Parts Parts List _ 9 27 APPENDIX D D l BASIC Staten tents Necessary to Send Bus Commands _ __ _ _ D l APPENDIX F Fl IEEE...

Page 16: ...p __ ___ _ _ _ 3 22 3 z EliminatingGrotidLoops __ _ _ _ m 3 22 SECTION 4 IEEE 488 PROGRAMMING 41 SystemTypes 42 42 IFXE 488 Connector 4 2 43 IEE E 488 connections _____ _ _ _ 43 44 Model 595 Rear Pane...

Page 17: ...r Voltage Source Verification __ _ 6 8 SECTION 7 THEORY OF OPERATION 7 l 7 2 7 3 7 4 7 5 7 6 7 7 7 8 7 9 7 10 7 11 7 12 7 13 7 14 7 15 7 16 7 17 7 18 7 19 Feedback Charge Method 7 l TiingVoltageandCha...

Page 18: ...mponent Location Dwg No 595 ll0 __ ______ ___ _ _ _ ___ ___ _ ___ 9 18 9 4 Display Board Schematic Diagram Dwg No 595 116 ___ _ _ _ _ __ __ _ _ __ 9 19 9 5 amp Board Component Location Dwg No 595 160...

Page 19: ...rors l 4 Digit Display An easy to read front panel LED display includes a 4 digit mantissa with selectable alphanumeric or scientific range annunciation l Zero Correct A front panel zero correct contr...

Page 20: ...capabilities Model 1019A and 1019s Rack Mounting Kits The Model lOl9A is a fixed or stationary rack mounting kit with two front panels provided to enable either single or dual side by side mounting of...

Page 21: ...ur 2 2 2 Line Voltage Selection The operating voltage of the instrument is internally select able Refer to Section 8 for the procedure to change or verify the line voltage setting 2 2 3 Line Frequency...

Page 22: ...ion the decimal points in the two exponent digits will flash If such errors occur the instrument may be partially or com pleteIy inoperative Refer to Section 8 for more complete details 2 4 GENERAL DI...

Page 23: ...tion sent Number Error Calibration voltage source waveform parameter or program value beyond allowable range Trigger Ovemm Error Instrument triggered during a measurement conversion RAM Test Fallure O...

Page 24: ...nfigures the Model 595 to measure current from 1fA to 2oofi El 4 CAPACITANCE Configures the Model 595 to measure capaci tance from OlpF to 20nF w SHIFT Q t CAPACITANCE display modifier Displays curren...

Page 25: ...n of displayed STEP V or VOLTAGE SOURCE value Press SHIFT to trigger a reading from front panel cl 18 DISPLAY SOURCE Show VOLTAGE SOURCE value Correspond tng LED fl hes when current limit of 2mA has b...

Page 26: ...ARD VOLTAGE SOURCE OUTPUT Isolated SNC connector Inner con output HI outer conductor is GUARD Voltage is sourced from this wtpuf to bias devices when making current or capacitance measurements Referen...

Page 27: ...and probe apparatus is shown in Figure 2 3A a packaged capacitor in a test box is shown in Figure 2 3B and a setup with an external voltage source is shown in Figure 2 3C A MEASUREMENT SETUP FOR DEVI...

Page 28: ...6 Connect capacitance in fixture 7 ZERO CJFIECK 8 SHIFT then STORE Co O OOT ool2 oooo oooo 4562 4562 9 UC 1 0000 10 SHIFT then Q t oooo Il CAPACITANCE 1 0000 IiF IIF Memow test RAM Memo6 test ROMj 20...

Page 29: ...e source upper LIMIT 20V displayed Adjust voltage source upper LIMIT to 4V Press SHIFT then AD JUST for coarse adjustment Voltagesource lower LIMIT 2OV displayed Adjust voltage source lower LIMIT to l...

Page 30: ...dc nF Return display to meter 23 ZERO CHECK dc nF Turn off ZERO CHECK 24 SELECT v xX xXx nF Capacitance readings during staircase dc appears when staircase dc III reaches upper LIMIT NOTE SC PPRESS C...

Page 31: ...CURRENT 3 RANGE v r r CO 0 000 OOOT 0 OOT 0 000 oooo Memory test RAM Memory test ROM IIF 2OnFcapacitance range ZERO CHECK on squtie wsVe IL4 Place unit in CURRENT function PA Sethunit to 2OpA range C...

Page 32: ...s Display Remarks MEASURE IV 1 CURRENT 0 002 nA Place unit in CURRENT function then press RANGE A to put instrument to appropriate range in this case the 2Ofi range CONNECT RESISTOR 2 SHIFT then V LIM...

Page 33: ...ituations where vibration may be present such as a vacuum pump tape the cables to a stable object to avoid excessive vibra tion and electrical noise Note see warnings in paragraph 2 5 before operating...

Page 34: ...NAL VOLTAGE SOURCE w EXTERNAL VOLTAGE SOURCE OPTIONAL SHIELD El USING HODEL 595 S VOLTAGE SOURCE __ ___ PANEL I tlETAL TEST BOX Figure3 2 Connections for CurrentMeasurements The CURRENT button places...

Page 35: ...equent readings by the stored reading Co and show the resulting quotient on the display Once a value of Co is stored it will be retained in memory until a new value is stored or the instrument is turn...

Page 36: ...pA 2nA ZOnA 2OOnA 2pA 206 and 2004 The in strument powers up on the 2OnF capacitance range When making a measurement choose the lowest range possible without overloading the Model 595 This win maxi mi...

Page 37: ...T and PRESET The A LIMIT and I LlMIT buttons set the maximum and minimum voltage that the voltage source will output These limits may be set by the user to protect a device that could be damaged by ex...

Page 38: ...irii mum limit respectively The indicator light adjacent to the DISPLAYSOURCE but ton is on when the programmed output voltage is being displayed This light will flash when the output voltage cur rent...

Page 39: ...s I rfHP 1 Corrected Capacitance Corrects capacitance readings for error currents l correction on O correction off See Section 5 34 before using IEFt IEEE 488Address IEEE 488Address Selection Program...

Page 40: ...ering the number of measurements cr samples in the curve specifically the fun damental portion to be studied region of interest Filter 1 is used when there are 20 or more samples in the fundamental ch...

Page 41: ...OPERATION Figure3 5 Example Usingthe Filter on a MOS Device Curve 3 9...

Page 42: ...r is a stimulus to the Model 595 to begin a measurement Triggering may be done in two basic ways continuous or one shot In continuous the stimulus starts a series of measurements In one shot trigger a...

Page 43: ...the device under test is not in equilibrium See paragraphs 5 3 3and 5 3 4for information to determine con ditions for equilibrium and proper use of the capacitance correction program Touse this progr...

Page 44: ...then EXIT to return to normal operation dISP Plotter Parameters Use either of the voltage source ADJUSTbuttons to set the exponent to the desired display In the numeric function The following front pa...

Page 45: ...l EXTERNALTRIGGER INPUT Continuous trigger or one shot trigger may be selected by the front panel pro gram see paragraph 3 4 4 or over the IEEE 488bus The commands for external trigger are T6 continuo...

Page 46: ...the voltage being soured CAUTION Do not exceed 30V between the METER COM PLETE common outer ring and chassis ground or a shock hazard may be present 2 Select the desired function range trigger and oth...

Page 47: ...eform to DC Next w usmg the voltage source block apply different voltages to the device to determine its acliw range For a zener diode the nt will rapidly increase at its eversezoner voltage Try to fm...

Page 48: ...desired the step direction or voltage source can be adjusted at this time then the staircase can be resumed by return mg tne wavetonn to x 1 Reading rate is a function of delay time For capacitance me...

Page 49: ...run Analysis of the cuve shows that the knee of the curve or region of interest achmlly falls in the region between 6 5V and 5 5V To inaease resolution of the region of interest the grid and curve are...

Page 50: ...OPERATlON Figure3 9 IV Curvesof a 6 3 Zener Diode 3 16...

Page 51: ...o be affected 3 11 PRINTING RESULTS The Model 595 can output data to a listen oniy or ad dressable IEEE 488printer The printer s address must be set to 3 In order to send data to a printer the Model 5...

Page 52: ...ied the basic shape ofthe curve is maintained while the peaks due to noise are smoothed out This is an appropriate application for Filter 2 Filter 1 was not used since there are more than 50 readings...

Page 53: ...OPERATION Figure3 10 MOS DeviceCV Curvewith Filters 3 21...

Page 54: ...s connected directly to power line ground Experimentation is sometimes the best way to determine an acceptable arrangement For this pur pose measuring instruments should be placed on their lowest rang...

Page 55: ...hielding the instrument experiment and test leads wiIl often reduce RFI to an acceptable level In ex treme cases a specially constructed screen room may be necessary to sufficiently attenuate the trou...

Page 56: ...e capacitance function source capacitance will degrade noise performance as it does for the current function In this case however the Model 595 performance specifica tions take into account the noise...

Page 57: ...rument in the capacitance function Make sure to press the END LJNE key after each line is typed When END LINE is pressed the first time the instru ment will be placed in the remote listen state by the...

Page 58: ...he IEEE 88 bus through a cable equipped with standard IEEE 488 cotiec tars shown in Figure 4 2 The connector is designed to be stacked to allow a number of parallel connections Two screws are located...

Page 59: ...8 type connect while others do not Corisult the instruction manual of your controller for the proper connecting method r r EE SSSlwTERFAcE EE SSSlwTERFAcE ADORES ENTEREDWITH ADORES ENTEREDWITH 1 FRONT...

Page 60: ...the value specified as part oftthe controller s programming language Tocheck the present primary address or to change toa new one perform the foIIowing procedure 1 Press the PROGRAM MENU button until...

Page 61: ...n The RL function defmes the ability of the instrument to be placed in remote or local While the instrument is in remote the front panel controls are funaional unless LLO local lockout has been assert...

Page 62: ...ement Transmit shing to device 28 Obtain string from device 28 Send GTL to device 28 Send SDC to device 28 Send DCL to all devices Send Remote Enable Cancel Remote Enable Serial poll device 28 Send Lo...

Page 63: ...rument is in the cur rent function FL A number or conflitierror will cause the command to be ignored but not theentire string if all else is legal and the following message will be displayed briefly n...

Page 64: ...ed assume that are properly nude the Model 595 mimarv address is set to 28 its default address 4 8 2 IFC Interface Clear 4 8 1 REN Remote Enable The IFC command is sent by the controller to place the...

Page 65: ...t of remote With some instruments GlT may also cancel LLG With the Model 595 however REAI must first be set false 0 before LLO will be cancelled To send GTL the controller must perform the following s...

Page 66: ...rial Polling The serial polling sequence is used to obtain the Model 595 serial poll byte The serial poll byte contains important in formation about internal functions as described in paragraph 4 9 20...

Page 67: ...time but they will be retained within an internal command buffer for execution at the time the X character is received If any errors occur the instrument will display appropriate front panel error me...

Page 68: ...el 595 to listen 3 Set p T Ifalse 4 Send the command string over the bus one byte at a time NOTE REN must be true when sending device dependent commands to the instrument or it wiIl ignore the command...

Page 69: ...value Filter off Filter 1 1 P2 Wer 2 P3 iFilter 3 DC measurements ANDS Hnn nn Set high lit of voltage source 4 9 9 Hw where nn nn 2O OOVto 2O OOV Lnn nn Set low limit of voltage source 4 9 10 L 20 wh...

Page 70: ...7 T e new Co value Capacitance d iq yed not co d Qkdisplayed capacitance not corrected Capacitance displayed capacitance corrected Q t displayed capacitance corrected TERMINATE ON EACH READING 0 Read...

Page 71: ...terminator _ Annn nnE nn Calibration value using exponent 4 9 24 Perform self test 4 925 3 No operation Jl9 Store calibration constants in permanent memory Status uo Send machine status word 4 9 23 2...

Page 72: ...s sent without the execute character will be stored within an internal command buffer for later execution When the X character is finally transmitted the stored commands w3 lbe executed assuming that...

Page 73: ...tep voltage or the delay time setting Upon power up or after receiving a DCL or SDC command the instrument will be in DO In general the equivalent front panel controls for the D command are the LIMITS...

Page 74: ...after receiving a DCL or SDC command the instrument will be in FO The equivalent front panel controls for the F command are the CURRENT and CAPACITANCE Q tbuttons See paragraphs 3 3 1 and 3 3 2 for co...

Page 75: ...Model 595 automatically limits the capacitance range number to 3 Upon power up or after receiving a DCL or SD Ccommand the instnxnent wiIl be in R3 The equivalent front panel controls for the R comman...

Page 76: ...readings The correction value will be stored in permanent memory and reapplied upon power ups The 22 command can be sent with the Zero Check on or off Use the following procedure to zero the CUP rent...

Page 77: ...expected measurement 3 Connect the signal to be used as a baseline to the instrument input perhaps the strays of an opened fixture 4 Turn on Suppress by sending NlX over the bus and wait for the basel...

Page 78: ...response time The P3 filter is used to filter non changing input signals Upon power up or after a DCL or SDC command is received the filter will be off PO From the front panel filter is controlled by...

Page 79: ...n be set A positive going staircase will stop at the high lit Upon power up or after a DCL or SDC conimand is received the high limit will be set to 2O OOV The equivalent front panel control for the H...

Page 80: ...going staircase will stop at the low limit Upon power up or after a DCL or SDC command is received the low limit will be set to 2O OOV Reference The equivalent front panel control for the L command is...

Page 81: ...age level to the voltage source output connector The output is controlled by the W waveform command see paragraph 4 9 14 Upon power up or after a DCL or SDC command is received the voltage source will...

Page 82: ...to square wave and staircase waveforms Upon power up or after a DCL or SDC commandis received the step voltage will be 5OmV 52 The equivalent front panel controls for the S command are the STEP V ADJU...

Page 83: ...pecification clarification at beginning of manual Capdance readings are displayed for every other step nt readings are displayed for each step See Figure 3 3 for an illustration of delay time Upon pow...

Page 84: ...tep of the staircase is determined by the S coinmand and the time dura tion at each step is determined by the I command When W3 is sent the voltage level staircases to the limit of the voltage source...

Page 85: ...power up or after a DCL or SDC coriiinafid is received C Cowill be off with no reading stored CO The equivalent front panel control for the C command is the UC0 STORE Co but ton See paragraph 3 3 3 fo...

Page 86: ...s of the delay time or 44msec whichever is greater The Q2 and Q3 commands are used to cor rect the capacitance reading for DC leakage current errors Upon power up or after a DCL or SDC command is rece...

Page 87: ...rresponds to the A Doutput counts and does not reflect the range that the instrument is on For example 236pF applied to the input will show a plotter format reading of 2360 on the 2nF range and 236 on...

Page 88: ...E VOLTAGE G r 8 CURRENT OATA STRING N NORMAL MANT ISSA EXPO NENT REAAING O OVEARANGE VOLTAGE Z ZERO CHECK VX CURRENT VOLTAGE C PLOTTER FORMAT MEASUREMENT PO 01826 12345 PU PEN Up v READING PO PEN DOWN...

Page 89: ...ds can be used to force the pen down while 01 and 05 will force the pen up Gain Control The 0 command also controls the gain of the C I Q t ANALOG OUTPUT At Xl gain l lOOdisplay counts will output 1V...

Page 90: ...s will continue when the required trigger occurs When set for a s rcase output the voltage source out put will switch to DC and display the triG message when a triaer command is sent To continue the s...

Page 91: ...ns 1 Jf a reading overflow occurs Ml 2 When a staircase sweep is complete M4 3 When a reading is done MS 4 When the instrument is ready to accept bus commands M16 5 When an error condition occurs M32...

Page 92: ...d IDDC or an illegal device dependent command option IDDCO was transmitted The instrument was programmed when not in remote A conflict error has occurred sending a Q or C command while in the cwrent f...

Page 93: ...lt conditions Line 30 programs the SRQ mode Line 40 then attempts to program an illegal command at which point the instrument generates an SRQ and sets the bus error bit in its serial poll byte The co...

Page 94: ...other terminator sequences are used Bus hold off allows the instrument to temporarily hold up bus operation when its receives the X character until it processes all commands sent in the command string...

Page 95: ...eturn to KO Example To program the instrument for KZ enter the folIowing statements into the HP 85 REIIOTE 728 nUTf T 72 3i r 6K2 3 When the second statement is executed the instrument will be placed...

Page 96: ...nators is the carriage return line feed CR LF sequence YU Selecting the wrong terminator for the controller could cause the bus to hang up Upon power up or after a DCL or SDC command is received the Y...

Page 97: ...tions The error status word Figure 4 9 is actually a string of ASCII characters representing binary bit posi tions Reading the Ul status clears the error bits An error condition is also flagged in the...

Page 98: ...IRCASE T E 8 1 2Oin 2 50mV 3 loom 4 1Orn 5 2Om 6 5Onl 7 lOOmV CAPAClTANCE MODIFIERS 0 0 CAP DISPLAYED CAPACITANCE NOT CORRECTED 1 a t DISPLAYED CAPACITANCE NOT CORRECTED 2 CAP DISPLAYED CAPACITANCE CO...

Page 99: ...ons The U2 word is made up of ASCII characters representing binary values 0 or 1 The bits in the U2 data status word are described as follows MODEL NO TEMPORARY CAL voLTIA_GL IOT RcE f 5OHZ 595 I O l...

Page 100: ...units are in seconds Figure 4 11 U3 Delay Time U4 The U4 command allows access to the high and low limif settings of the voltage source Figure 4 12 U4 Voltage Source Limits U5 The US command allows ac...

Page 101: ...rce US will reset to OV Example Enter the following statements into the computer to obtain and display the UO machine status word of the Model 595 PROGRAM COMMENTS Send remote enable Send UO command O...

Page 102: ...over the IEEE 488 bus consists of applying a precise calibration signal to the Model 595 input and sending the corresponding calibration value over the bus using the A command CAUTION Precision calib...

Page 103: ...st error bit in the Ul status word will be set to 0 Otherwise this bit will be set to 1 The test does not affect any data within the memory Permanent Storage When the Jl9 command is sent calibration c...

Page 104: ...line 50 Press the RUN key to run the program Line 30 will place the instrument in the capacitance function with zero check enabled default conditions Lime40 will turn the voltage source off Line 50 w...

Page 105: ...nge Line 50 will release the zero check and lines 60 and 70 will send and display the current reading on the com puter CRT 4 11 TALK ONLY In Talk Only the instnxnent will control the bus and out put d...

Page 106: ...connected to the bus at the same time as long as they are in the addressable mode and set to the correct address address 5 for the plotter address 3 for the printer 5 Using the plotter sets the K Y an...

Page 107: ...sistor is equal to the voltage source output to within one millivolt The current I flow Since very high resistance measurements are subject to leakage Nzent errors circuit connections must be carefull...

Page 108: ...sing the staircase waveform a series of V I data points rnay be generated to calculate the resistance value and voltage coefficient over a specific voltage r nge 5 2 3 IV Characteristics of Diodes The...

Page 109: ...APPLICATIONS Figure 5 2 IV Characteristics of a Zener Diode 5 1V lN751 5 3...

Page 110: ...racteristics of a This process is then repeated for a number of base current bipolar transistor or the common source characteristics of settings Data may be plotted showing characteristics such a FET...

Page 111: ...so that only the very low Model 595 supplies minus the drain source voltage V with its input bias current disturbs the reading If either of these voltage source and measurks the drain current I in th...

Page 112: ...pA and 2OpAranges which re quire 2 5sec to settle to 1 A second tixample of low current measurement is that of capacitor leakage Once the leakage current is known the insulation res stancecan be calcu...

Page 113: ...I 31 CABLE I JYLL 0 YIJ ItiCE IANANA o PLUG OAPTER L 595 SET TO CURRENT GUARD MODEL 6104 POMONA MODEL 4585 PATCH CORDS SHIELDED TEST FIXTURE 6104 SHIELD __ 1 595 PiEAMP TO A D Figure 5 7 Leakage Curre...

Page 114: ...ge currents of femtoamps or less can cause appreciable errors in the capacitance measurement Tokeep interference from stray currents low insulation resistance in the device under test and the fixture...

Page 115: ...one plotting Qkversus V can be helpful in diagnosing DCerror current sources It is important to note the level of DC error currents in depletion and accumulation for later use in determining condition...

Page 116: ...T X 530 PLOT Q t US t FOR 1 STEP 540 MOUE 0 D 0 550 FOR X 1 TO I00 560 DRAW T X O X 570 NEXT X 580 PEN 0 690 IF P il THEN 630 600 GRAPH 610 COPY 620 PRINT PRINTS PRINT PRINT 630 CLEAR 640 DISP TYPE D...

Page 117: ...THIS PROGRAM IS USED TO MEASURE C 8 Q t WITH A SQUARE WAVE WHILE VARYING DELAY TIME AND PLOT OATH I 30 IM AGE DDD DD 2X D DDDDE ZX D DDDE 100 DIM C 100 Q 100 T l00 110 DIM A51351 120 CLEAR 130 DISF I...

Page 118: ...180 150 130 110 go f 70 z 50 z 30 10 20 10 0 30 0 20 40 60 80 100 Delay Time in Seconds Figure 5 11 Recognizing Equilibrium Using C and Q t vs Delay Time Inversion Substrate Voltage 8V Squarewave Tes...

Page 119: ...ion Deep depletion is simply the effect of changing the gate bias so quickly from the depletion region to the inversion region that the inversion layer cannot appreciably build up and C satisfies the...

Page 120: ...APPUCATIONS 5 4 3 2 1 0 1 2 3 4 5 Substrate Bias in Volts Figure 5 12 Corrected and Uncorrected CV Curves of a Simulated Leaky Capacitor C corrected C Q t Step Time Step s 14...

Page 121: ...APPLICATIONS 2 0 2 Accumulation Depletion Deep Depletion inversion Non equilibrium 2s Substrate Bias in Volts Figure 5 13 Recognizing Equilibrium Using C vs V and Q t vs V 5 15...

Page 122: ...TIONS 0 3 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 2 2 Accumulation Depletion Deep Depletion Inversion 6 a 6 a Substrate Bias in Volts Figure 5 14 Misuse of Corrected Capacitance Program on Non Equilibrium Cur...

Page 123: ...d circuit decreases further reducing the signal to noise ratio of the measurement Also feedback resistors needed to amplify low currents must be extremely large perhaps lOOGoor more Resistors this lar...

Page 124: ...APPUCATIOUS TRADITIONAL RAMP METHOD RAJP x DUT IRF FEEDBACK CHARGED METHOD Figure 5 15 Comparison of Quasistatic W Methods 5 18...

Page 125: ...The DUT C and C form a capacitive divider The midpoint of the divider is monitored by a high input impedance buffer The voltage at the out put of the buffer is therefore an indication of the charge on...

Page 126: ...rements but the change in V may consequently be only miaovolts making measurement dif ficult Usually C is chosen to be nearly equal to CL The feedback charge method as the name implies uses a feedback...

Page 127: ...mated C V and IYI w Curves for MOS Device Analysis Sandia Report SANDgO 1308 1982 D Ramp Method 1 Kuhn M A Quasistatic Technique for MOS C Vand Surface State Measurements Solid State Electronics 13 87...

Page 128: ...current is to be checked do so at 23 C Q C 6 3 INITIAL CONDITIONS The Model 595 must be huned on and allowed to warm up for at least two hours before beginning the verification procedures N0TE Wait a...

Page 129: ...by qualified personnel using accurate and reliable test equipment Jf the instrument is out of specification refer to Section 8 for calibration procedures unless the unit is still under warranty WARNIN...

Page 130: ...mmeter measure the actual value of to the instrument as shown in Figure 6 2 the 1OOMQresistor and record itsvalue in the ap 4 With ZERO CHECK still enabled verify that the displav propriate space in t...

Page 131: ...CABLE r pI x3 DECADE RESISTANCE BOX BNC TO BANANA PLUG ADAPTER POHONA 1269 SHORTING LINKS CONNECTED P P P OC CALIBRATOR SNORTING LINK J IIOOEL 595 DISCONNECTED Figure 6 2 Setup for Current Verificati...

Page 132: ...Verify that the display shows O oOOnA 1 count lf not perform Correct 12 Mount the lOOM0resistor in the shielded fixture con struction is covered in Figure 6 1 and connect the fii me tom the instrument...

Page 133: ...5955 is a set Ofcharacterized measured capacitors that can be used for verification Before using the capacitors make sure that the data for re characterization has not passed The characterization proc...

Page 134: ...TAGE SOURCE OUTPUT connector as shown in Figure 6 4 2 Select an appropriate DCV range on the DMM Alter nately place the DMM in autorange if desired 3 Press the DISPLAY SOURCE button to view the voltag...

Page 135: ...PERFORMANCE VERIFICATION ENC TO BANANA PLUG ADAPTER POMONA 1296 UL nlrt ISOURCE 0111 111 HODEL 197 IIODEL 595 Figure 6 4 Setup for Voltage Source Verification 6 8...

Page 136: ...the integrator output as follows AV nQ C The v age source is then changed by a small amount dv causing a charge to to be transferred to Cx The charge on Cx is proportional to the voltage change dQ 7 C...

Page 137: ...out put scaled X2 in the output stage 7 4 1 D A Converter The D Aconverter and associated circuitry are shown in Figure 7 4 Ul39 is a multiplying current output converter A l2 bit digital value is pr...

Page 138: ...OPERATION c I HETER INPUT MULTI PLEXER A D CONVERTER t tlICRO COHPUlER I V SOURCE OUTPUT 200X 100x A D A CONVERTER QREF I I BUFFER MULTI PLEXER 1OmV w OmV STEP SOURCE Figure 7 3 Model 595 Simplified D...

Page 139: ...THE N OF OPERATION u139 RF SRI 1 Cl36 Iour STBl Iour CD2 VREC 10 24V TO U142C PIN 8 RI20 ou po l STAGE Figure 7 4 Voltage Source D A Converter Circutry 7 4...

Page 140: ...puts of the precision stepssource and the D Acon verter are combined buffered and current limited by the output stage of the voltage source A simplified diagram of the output stage minus the current l...

Page 141: ...THEORY OF OPEVWTION I T RI38 FROM STEP SOURCE RI67 FROM O A CONVERTER C RI12 Figure 7 6 Output Stage Circuitry Simplified 7 6...

Page 142: ...THEORY OF OPERATION Figure 7 7 Current Limiting for Output Stage 7 7...

Page 143: ...plifier Confiw tions AC voltage cycles The result is an average of around l2V aaoss CE8 This level iscompared to the 6 3V of the D A S ifi reference circuit by U142C When power is turned on this pet c...

Page 144: ...OPERATION FEEDBACK AND SWITCHING SIGNAL INPUT STAGE INPUT 0302 DUTPUT TO XI0 AHP AND IIULTIPLEXER Figure 7 9 Block Diagram of Input Preamplifier Figure 7 10 Circuit Configuration for Current and Capac...

Page 145: ...22 R I302 R321 and R3l6 The wiper of The JFET amplifier circuit is comprised of Q302 R323 R324 lW7 is adjustable to k5V This voltage is divided with Kl3Ul RX R3l3 and R314 This biasing configuration r...

Page 146: ...tions The configuration of the feedback elements md relay switches are shown in Figure 7 12 Able 7 1shows the state of the relay switches for each range C322 and C302 are The ZERO CHECK relay K3Ol is...

Page 147: ...line chage is measured following discharge and subse quent charge measurements are referrenced to this baseline The discharge switch is a low leakage diode bridge Q304 and 4305 as shown in Figure 7 13...

Page 148: ...THEORY OF OPERATION U302 DISCHARGE 11 R3S2 R351 R346 R303 R347 R354 RBtG R350 n C320 I AA 0 I t 1 I PREAMPLIFIER 0 Figure 7 13 Fast Discharge Circuitry 7 13...

Page 149: ...amplifier Xl or the Xl0 ed of U30 R3W R308 and C3U7 C305 and C306 are offset ampliier is selected during the signal phase null storage capacitors for U304 The configuration is skply a non inverting Xl...

Page 150: ...THEORY OF OPERATION MULTIPLEXER CONTROL XI0 SIGNAL FROM o COMMON Figure 7 15 Multiplexer and Buffer 7 15...

Page 151: ...lue to the final 2V reference voltage 2v RI45 EFERENCE Figure 747 2V Reference Source 7 9 A D CONVERTER The Model 595 uses an A D converter that utiliies both constant frequency charge balance and sin...

Page 152: ...C y SINGLE SLOPE ENABLE DISABLE ONVERTER n rNpuT li zJ I LEV INTEGRATOR SHI CURR IL v 137A U135A TO MPU ALANCE 1 GENERATOR I CHARGE BALANCE CURRENT INTEGRATOR OUTPUT YAVEFORR PHASE MEASUREMENT PHASE F...

Page 153: ...ration is controlled by the internal microcom puter and associated software The following paragraphs briefly describe the various aspects of the digital circuitry Descriptions are keyed to the digital...

Page 154: ...utput of the 9914 IC is in standard IEEE 488 format the eight data lines IO1 DI08 the three handshake lines DAV NRFD NDAC and the five management lines ATN REN lFC SRQ and EOI are all active low with...

Page 155: ...segments in the selected digit are turned on When a latch output is selected segments in the selected digit are turned on Digit selection is performed by data from the PA3 PA4 and PA5 outputs of the...

Page 156: ...THEORY OF OPERATION U3OG 1 R336 WV 0 R335 YR303 c I R337 ZC313 ANALOG VR304 OUTPUT 0 v R329 R332 R343 TV 0 VR305 Y R344 I C315 ANALOG YR306 OUTPUT 0 Figure 7 19 Analog Outputs 7 21...

Page 157: ...i24V kl5V and 5V supplies The 24Vand iJ5V sources supply the voltage source analog outputs preamplifier and the 5V supplyis used for the digital chlitly The 24V supplies consist of half wave rectifier...

Page 158: ...may be operated at a line frequency of either 50 or 60 Hz The instmmenfs frequency may be set with 4 Mark the selected line voltageon the rear panel for future the front panel line frequency program X...

Page 159: ...o Blo FU 21 CAUTION Do not use a fuse with a higher current rating than specified or instrument damage may oc cur If the instrument repeatedly blows fuses locate and correct the cause of the trouble b...

Page 160: ...to stabilize before beginning the calibration procedure Typically it takes one additional hour to stabilize a unit that is 1O C OF out side the specified temperatore range NOTE While rated accuracy is...

Page 161: ...L I I I I I L I I C C I I I VOLTAGE SOURCE AOJIJST ACCESSED FROM REAR PANEL OFFSET VOLTAGE ADJUST INPUT CURRENl ADJUST ZERO HOP ADJUST VOLTAGE SOURCE ANALOG OUTPUT ADJUST I c ANALOG OUTPUT ADJUST FRO...

Page 162: ...gram menu as long as the instrument remains on This allows the technician to select the calibration program without turning off the instrumentand subsequently los ing temporary calibration points 8 5...

Page 163: ...Zero Hop Compensation paragraph 8 510 3 Input current adjustment paragraph 8 5 11 4 Capacitance offset compensation paragraph 8 5 1 2 5 Voltage source calibration paragraph 8 5 13 6 Current calibrati...

Page 164: ...3 was accidentally adjusted Equipment Needed Oscilloscope with a Xl probe and an RC filter See Figure 8 3 for filter component values and Setup Perform the following procedure to adjust zero hop 1 Set...

Page 165: ...squarewave step Disable ZERO CHECK if it is Oxi 2 Place the protection captionthe METER INFUT connector 3 For front panel calibration A Make sure the ca ration program is selected B Press SHIFT and th...

Page 166: ...MAINTENANCE BANANA PLUG ADAPTE POPIDNA 1296 MODEL 197 s jJ flODEL 595 Figure 8 4 Voltage Source Output Calibration Setup MODEL 197 MODEL 595 8 9...

Page 167: ...f the 1OGQ resistor is lO lGQ the calibrator voltage value would be 1 919V NOTE Do not touch the body of the resistors Contamina tion could give erroneous results 2 Place the instrument in the current...

Page 168: ...anent inemory at this time perform the procedure and 200fi ranges F X maximum accuracy remember in paragraph 8 5 to m apply suppression at r each range is selected with O LA on the input calibrator ou...

Page 169: ...DECADE RESISTANCE BOX BANANA PLUG ADAPTER POMONA 1269 4801 AGL SHORTING LINK CONNECTED DC CALIBRATOR SHORTING LINK DISCONNECTED Figure 8 7 Current Calibration Setup 2Ofi to 2OOfi Ranges 812...

Page 170: ...the Q t display 3 Make sure the calibration program is selected if calibra tion is to be done from the front panel 4 Verify that with a capped input the display reads OOO l nA 2 counts 5 Connect the...

Page 171: ...hble8 5 Each table entry defines the instrument setup range filter step V delay and input value Note that calibration must be performed in the order presented in the table 8 5 18 Storage of Calibratio...

Page 172: ...have been entered The nominal adjustment range is 56 However it is ire portant to note that such calibration will be only tem porary as these parameters will be lost when the power is turned off Unde...

Page 173: ...PREAIIP BOARD LOC TEJ Pbot OTHER SIDE LlF BOARO MOTHERBOARD BOTTOM SHIELQ PREAIIP BOARD STANDOFF 1 B 6 Figure 8 9 Model 595 Exploded View 8 16...

Page 174: ...nued protection against safety hazards power line ground the green wire con nected to the ac power receptacle must be con nected to the rear panel and mother board 8 7 SPECIAL HANDLING OF STATIC SENSI...

Page 175: ...ent will Upon power up the Model 595 will automatically test its RAM and ROM memory and check for proper calibration fenwin in this configuration as long as the C Cobutton 1s held in constants If a RA...

Page 176: ...ringing is present 8 8 5 ND Converter Checks Table 8 7 Diagnostic Program Phases Use the orocedure listed in Table 8 9 to make sure the AID converter is operating properly The operation of the AID co...

Page 177: ...2V div lOms div Required Condition waveform 1 Waveform 2 waveform 2 Waveform 2 Waveform 3 Waveform 3 Waveform 4 waveform 5 tk fonn 6 5V DC Naveform F Naveform 7 Vvavefonn8 Waveform 9 Waveform 10 Rema...

Page 178: ...WAVEFORM 3 WAVEFORM 3 WAVEFORM 4 WAVEFORM 5 WAVEFORM 8 WAVEFORM 6 WAVEFORM 7 a 21...

Page 179: ...to latches of u139 Waveform 13 6 35V O lV 1024v 9 5v 0 2v O lV 19 oOV o o5v 19 oov o o5v STROBE pass data to D A Zener voltage VRlOl Reference V Convert I output to V Output of op amp Output of X2 amp...

Page 180: ...MAINTENANCE WAVEFORM 11 WAVEFORM 12 I I WAVEFORM 13 WAVEFORM 14 WAVEFORM 15 8 23...

Page 181: ...g the range and function in question and then measuiing t3 e control voltage at the IC driver output When a relay is energized on the voltage at the output will be high while approximately OVwill be s...

Page 182: ...oneany range forkall others step voltage is O lOV Table 843 Capacitance Circuitry Checks ItemlCcJmponent IJ304 I ul31 I U305 pin 6 UPI pin 10 pins 3 br 6 Remarks ZVldiv Mmsldiv O SV div 50mddiv OSVid...

Page 183: ...WAVEFORM 16 WAVEFORM 17 WAVEFORM 19 WAVEFORM 19 hl Ill Inl InI WAVEFORM 20 I i i i i iii i i 1 I 1 I I I I I I I I WAVEFORM 21 WAVEFORM 18 8 26...

Page 184: ...cond delay and 0 W step Use scope set for 1Vldiv and 50ms div 1 TPl is the output of the preamplifier 2 U304 pin 10 is the output of the X10 amplifier 3 U329 pin 1 is the signal input to the multiplex...

Page 185: ...2V div 2Omsldiv 8 UlO2 pin 8 2V div ZO iiv 9 U102 pin 3 2V div 5Omsldiv Required Condition 5v g wavefoml23 Stays low cl set on power up then goes high 5v Waveform 24 waveform 25 Waveform 26 waveform...

Page 186: ...MAlNTENANCE WAVEFORM 25 WAVEFORM 25 WAVEFORM 26 WAVEFORM 27 WAVEFORM 28 WAVEFORM 29 8 29...

Page 187: ...form 33 Depress C Co RANGE A SHIFT STEP V ADJUST v or SELECT A buttonand observe Waveform 33 Depress CURRENT CAPACITANCE ZERO CHECK v LtiIT ADJUST A DISPLAY SOURCE or MENU button and observe Waveform...

Page 188: ...ompare the value to the ranges listed in Table8 V From this table you can determine which position jumper W301 should be placed in For example if the display shows between 1200 and 200 corints jumper...

Page 189: ...a small clean brush wipe the area thoroughly un lil it is free of flux or contaminants In some cases it may be helpful to tilt the board at an angle and brush con taminants away from ihe affected area...

Page 190: ...contact your Keith representative or the factory See inside front cover for addresses When ordering indude the following information 1 Instrument Model Number 2 Instrument Serial Number 3 Parts Descri...

Page 191: ...or lCOpF ZOCW Ceramic Disc Capacitor 15pF lOOOV Ceramic Disc Capacitor 82pF lOOOV Ceramic Disc Capacitor lOOOpF lOCW Ceramic Disc Capacitor 0 13 5OV Ceramic Film Capacitor Ol5 XMV Ceramic Disc Capacit...

Page 192: ...W RL90 QlOl Transistor Silicon NPN TIP 49 l El TG 137 4102 Transistor Silicon NPN 2N3904 l D1 TG 47 4103 Transistor SiIicon NF N 2N3904 l F3 TG 47 Q104 Transistor Silicon PNl 2N3906 l F3 TG84 4105 Tra...

Page 193: ...l W Metal Film Resistor 2OOkQ 5 W Composition Resistor Set lOk includes R14O and R143 Resistor lOOkQ 5 y4W Composition Resistor 22kQ 5 hW Composition Resistor Set lOk includes Rl4O and R143 Resistor...

Page 194: ...74HC373 IC Quad 2 Input NAND Gate 74HCOO IC Triple 3 Input OR Gate CD4075BE IC GPIB Adapter 9914A IC T State Octal Latch 74HC373 IC T State Octal Latch 74HC373 IC Quad 2 Input NOR Gate 74HCO2 IC Tripl...

Page 195: ...ier TLC27l In39 CMOS Serial Input X Bit DAC 7543KN u140 IC Operational Amplifier OP 14E UMl IC Linear Op Amp 308A UN IC Quad Comparator LM339 u143 IC Regulator 78Ll5 UN4 IC l5V Voliage Regulator LM32O...

Page 196: ...L II II II II w II 09 Y Figure...

Page 197: ...REPLACEABLE PAR 5 II S654 VOLTAGE SOURCE Figure 9 2 Mother Board Schematic Diagram Dwg No 595 106 sheet 1 of 3 g 9 9 10...

Page 198: ...A 301 S6S I I I I I I REPLACEABLE PARTS Figure 9 2 Mother Board Schematic Diagram Dwg No 596 106 sheet 2 of 3 9 11 12...

Page 199: ......

Page 200: ...ed LED Red Cable Ribbon Resistor Thick Film Resistor Thick Film Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch Pushbutton Switch Pus...

Page 201: ...2 Display Board Parts List Cont CiinIit Desig Description UZOl IC UDN2585A LIZ02 _ IC UDN2585A U203 IC 3 to 8 Line Decoder 74HCTI38 U204 IC UDN2595A LIZ05 IC UDN2595A U206 IC Analog Multiplexer 4051 g...

Page 202: ...REPLACEABLE PARTS l l so2 so I 02 sa EOZSQ I ZOZSQ IOZSCI Figure 9 3 Display Board Component Location Drawing Dwg No 595410 9 18...

Page 203: ...T...

Page 204: ...acitor 1OOpE lOOOV Ceramic Disc c3l8 Capacitor lOOpF IOOOV Ceramic Disc E c 64 IM p c319 Capacitor lOOpF 1000X Ceramic Disc c loop Capacitor 22pF SOW Polystyrene E c l loop_ C320 c321 Capacior 680pF l...

Page 205: ...5 49kQ l l W Composition Resistor 402kQ l V W Composition Resistor 9 98k0 0 146 W Metal Film Resistor 4 59k0 O l V W Metal Film Resistor lOOQ 196 W Composition Potentiometer 2kQ 25 Turn Trimpot Resis...

Page 206: ...mable Operational Amplifier CMOS Serial Input l2Bit DAC Linear Op Amplifier Linear Op Amplifier CMOS Serial Input l2 Bit DAC Linear Op Amplifier Linear Op Ampliier Inverting High Speed Operational Amp...

Page 207: ...Figure 9 5 Preamp Board Component Location Dwg No 595 160 a 9 24...

Page 208: ......

Page 209: ...el 595 311 METER INPUT Cable Assembly 1 Right Angle SMB connec r n e CS 546 1 BNC connector female cs 548 1 Coaxial Cable SC 110 V SOURCE OUTPUT Cable Assembly 1 Straight SMB connector female cs 550 1...

Page 210: ...Cable Bus In computetied equipment one or more conductors used as a path overwhich information is trwmitted from any of several so es to any of several destinations Byte A group of bits processed toge...

Page 211: ...n the surface potential exceeds the bulk potential k Abbreviation for kilo In computer terms lK equals 1024 For example a 16K byte memory has 16 384 bytes A 2 LED Light Emitting Diode A PN junction di...

Page 212: ...n an ins u simultaneously during the last Is of the delay time ore ment or computer that makes the unit operate 44msec whichever is greater with capacitance measnrements It is used to determine the ma...

Page 213: ...E438 Messages 0 00 NUL 1 01 SOH 2 02 STX 3 03 ETX 4 04 EOT 2 it2 7 07 8 9 i 10 OA 11 OB I2 oc I3 OD 14 OE so 15 OF SI 16 10 I7 11 18 12 19 X3 20 14 n 15 22 16 23 a 24 18 z 19 lA 27 lB 28 29 k ENQ ACK...

Page 214: ...24 25 26 27 28 29 2A it 2D 2E 2F 30 31 32 33 34 35 36 37 i 3D 3E SP f n Q i I 0 1 2 MLAO MLA 1 MLAZ MIA3 MLA 4 MLA5 MLA6 MLA 7 MLAS MLA9 MLAlO MLA 11 MLA 12 MLAl3 MLA 14 MLAl 5 MLA16 MLAl7 ML 418 MLA1...

Page 215: ...42 ii D 45 E 46 F 47 G 48 H 49 44 f 48 K 4c 4D it4 4E N 43 0 54 T 55 U 56 V 57 w 58 OX 59 Y 5A 2 5B 5c 5D i 5E n 95 5F MTAO IVITAl Mm2 MT43 MTA4 MTA5 MTA6 Mm7 MTA8 MTA9 M 10 M L4 11 MT l2 MTPl3 Mm 14...

Page 216: ...u 76 77 w z x Y it 7c E 7D x27 Ed DEL MSA 0 I PE MSA 1 PPE MSA 2 PPE MSA 3 PIT MSA k PPE MSA 5 PPE MSA 6 PPE MSA 7 PPE MSA S PPc MSA 9 PPE MSA lO PPE MSA WB MSA l2 PPE MSA l3 PPE MSA 14 PI E MSA l5 P...

Page 217: ...Nl co Cl c2 Rl RS zo Zl 22 VOLTAGE SOURCE High limit adjust Low limit adjust Step voltage adjust Delay time adjust Voltage source adjust A LIMIT ADJUST A 7 v LIMIT ADJUST A v STEP V ADJUST A v DELAY T...

Page 218: ...ystem configura tion file called CONFIG SYS must be present on the DOS boot disk as described in the Model 8573A Instruction MaImal 1 Boot up your system in the usual manner and enter BASICA 2 Place t...

Page 219: ...ce dependent command string to the instrument and obtain and display an instnxnent rkad ing string Program for the following controllers are included l IBM PC or XT with Keithley Model 8573A IEEE 488...

Page 220: ...he desired command string For pie to place the instru ment in the current function and 2004 range type iiiFlR8X and press the return key 7 The instrument reading string will then appear on ihe display...

Page 221: ...current function and ZOOfi range type in FlR8X and press the return kev 5 The instrument reading string will then appear on the CRT A typical diipIay is NIVX 0 595OOE 4 OO ODo PROGRAM COMMENTS 4M IN...

Page 222: ...GPiB interface installed in the HP85 computer 3 Enter the lines in the program below using t END LINE key after each line 4 Press the HP 85 RUN key and type in the desired command string at the comman...

Page 223: ...er 3 Type EDIT and press the EXEC key 4 Enter the lines in the program below using the ENTER key after each line 5 Press the 9816 RUN key and type in the desired command string at the command prompt F...

Page 224: ...ng the SIORE key after each line Line numbers are automatically assigned by the 9825A 4 Press the 9825A RUN key and type in the desired comman d string at the command prompt For example to place the i...

Page 225: ...ESS 8 Type in 9 and press the RETURN key 9 The display will read TEST SETUF lo Type in the desired command string and press the RETURN key For example to program the instrument for the current functio...

Page 226: ...nd press the RETURN key 5 The instrument reading string will then appear on the CRT A typical display is NlVXi 0 595OOE 12 OOO OO PROGRAM COMMENTS 10 OFEN 1 28 Open file 1 primary address 28 20 INFLIT...

Page 227: ...vices on the bus A talker sends data usually to the con troller and a listener receives data Depending on the in sixument a paticular device may be a talker only a listener only or both a talker and a...

Page 228: ...eight data lines to transmit and receive data in bit parallel byte serial fashion These lines use the con vention DIOl DIOS instead of the more common DO W DIOl is the least significant bit while DIO...

Page 229: ...ce Table F l IEEE 488 Bus Command Summary state of kuumand Type Command ATN Line Comments Jniline REN Remote Enable X Sets up devices for remote operation EOI X Marks end of transmission bAultiline Un...

Page 230: ...ch is used to determine which device on the bus is requesting service SPD Serial Poll Disable SPD is used by the controller to remove all devices on the bus from the serial poll mode and is generally...

Page 231: ...device dependent comman ds will depend on instrument configoration Generally these commands are sent as one or more ASCII characters that command the device to perform a specific action For example th...

Page 232: ...APPENDIX F I I Figure F 3 Command Codes F 6...

Page 233: ...pical device dependent command se quence Jn this instance MN is true while the instrument is being addressed but it is set high while sending the devicedependent command string Table F 4 Typical Devic...

Page 234: ...A R6 E l 2 2oh 4 Zero Checkt M Zero check off zl Zero check on 22 Zero check on and zero corrected Suppress NO suppress off Nl Suppress on using new value Filtert PO Filter off E Filter 1 Filter 2 P3...

Page 235: ...ected 2 Capacitances displayed capacitance corrected Q t displayed capacitance corrected refixes TEIWINm ON EACH READING z 0 Reading prefix 1 Reading no prefix EG 2 Plotter prefix 3 Plotter no prefix...

Page 236: ...Reading overflow Not used E Staircase done Reading done Ml6 Ready M32 Error EOI and Bus Hold off Ko Send EOI hold off on X E Do not send EOI hold off on X Send EOI do not hold off on X K3 Do not send...

Page 237: ...95 is set to IEEE488 codes 40 to 43 40 GS K O Y Cl 4l G l K O Y O 42 G 2K O Y 3 43 G 2 K O Y 3 GRID SEQUENCE The following command sequence is sent from the Model 595 over the IEEE 488 bus to cause th...

Page 238: ...ibration only cl Certificate of calibration required 0 Particular range or function bad specify 0 Batteries and fuses are OK 0 Checked all cables D Data required attach any additional sheets as necess...

Page 239: ...1 60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 7500 Fax 0118 929 7519...

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