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Model 2657A High Power System SourceMeter® Instrument

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1. HV triaxial to SHV cables i y k 7 Y 1 1 1 1 1 1 1 1 i 1 1 1 i s p 3 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com permon 1 ground earth may be required Keithley Instrument s Model CA 568 is a protective earth safety ground cable assembly 2 Interlock connection Model 26574 digital I O pin 24 INT and pin 22 5 VDC connected to the test fixture lid switch Keithley Instrument s Model 7709 308 is a 25 pin interlock male connector that can be used for custom connections Interlock switch is shown in the disengaged lid open position Model 2657A protective earth safety Additional connections for redundant protective Qty 1 3 Test fixture interlock switch connection 1 Le a 4 Interlocked metal safety enclosure 1 A safety enclosure with an interlock that has a normally open NO switch 5 Test fixture protective earth safety Redundant grounds may be required for specific ground test setups Model HV CA 571 3 High Voltage 2 See Using high voltage triaxial connectors on Triaxial Panel Mount Connector to page 2 7 Unterminated Cable Assembly 7 Model HV CA 554 High Voltage Triaxial 2 Cable Model 2657A Panel mount SHV connectors Customer supplied 10 Model SHV CA 553 High Voltage 2 Triaxial to SHV Cable If you are using a Model 8010 High Power Test
2. eeeeeeeeeeeenennnneennnennnnnnnnnn 6 1 o le mE OE A 6 1 Egulpiriebt REQUIRE scio tn cc MN RAM A a 6 1 Setup commuliledi isi5 do ea 6 2 Device connections unidad 6 3 Simple reverse Voltage SWEEP eei tite eise anda E A REO 6 5 Example COS eiaa ea irea a e ra UE IDEE a reai aaa 6 5 Example Usage cru iio lid an 6 8 Advanced reverse voltage sweep neeesser eee ee yeee eree stans aes inna akin naa ina a a sean a na 6 9 EXample COde one S 6 9 creme EE 6 12 Measunmig capacitor 1SAR AGS vysytya aententia ES 7 1 MiroductioN odes this its tren 7 1 Equipment requibed tet niei packet p terea oL Rete ate d eda tol elio tesa tear had 7 1 Setup COMMUNICATION m 7 2 Device CONCISA 7 2 Measuring leakage current and insulation resistance ee eee eee eee ee ee 7 4 Example Gode ceci e ed ds So 7 4 Example USAS sitio idol ta 7 6 Measuring MOSFET characteristics ccnannciionicn rn 8 1 Introduction e UM tid eae 8 1 EguipimienETequiEBg ucsserono reete a nda a HA apre estoy Ee aa ob Rd Va AH TR 8 1 Setup communicate rines 8 2 Device connectiofis se vete ee parece tip a is 8 3 BVass measurement aaa 8 6 Example 9161 sana ina 8 7 Example USAGE m lana rn toria iii ibas 8 8 EE ET 8 9 Example Code ua 8 9 Example saga fn E ME 8 11 Measuring thyristor DC characteristics ennn 9 1 inpol T 9 1 Equipment required for this example iia pre ERI its 9 1 oet up commubleat l
3. This call applies 0 V to the MOSFET gate terminal and programs the Model 2657A to generate a 500 point voltage sweep from 10 V to 1760 V at the drain terminal After each voltage step a 50 ms delay occurs before the current is measured The measurement is made at 1 PLC The measurements are stored in the instrument s reading buffers and are output from the communication interface immediately after the test is run Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Example output data is shown in the following graphic Figure 37 Example output data Measurement of Idss vs Drain Voltage 1 LE 05 1 00E 07 1 C0E 08 2 Mw 1 00E 09 1 00E 10 110641 0 200 4CO 600 80 1009 1200 1400 1600 1820 2000 Drain Voltage V Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 9 Measuring thyristor DC characteristics In this section Ia sep mij me Nd 9 1 Equipment required for this example eese 9 1 Ser up communication scsi A 9 2 Device COMMECHOMS emo 9 3 Vdrm and Idrm thyristor measurements sssssse 9 6 Determine the holding current of a thyristor 9 10 Determine the latching current of a thyristor 9 12 ntroduction These examples demonstrate how to use the Model 2657A High Power System SourceMeter In
4. Turn off the SMUs to complete the test smua source levelv 0 node 2 smua source levelv 0 node 2 smua source output 0 smua source output 0 printData end function printData if smua nvbufferl n 0 then print No reading in buffer else print Timestamps tVoltage tCurrent for i 1 smua nvbufferl n do print string format g t g t g smua nvbufferl timestamps il smua nvbuffer2 readings i smua nvbufferl readings i end end end Example usage The functions in this script allow updates to the test parameters without rewriting or re running the script To run the test call the Tdss function passing in the appropriate values for test parameters Idss parameters Parameter Description gatev volts Gate voltage to apply with Series 2600A System SourceMeter Instrument Start voltage for the drain voltage sweep Final voltage for the drain voltage sweep not applicable Number of voltage steps to perform in the voltage sweep measDelay seconds Measurement delay after applying drain voltage and before measuring drain leakage current measRange amps Fixed current measurement range used to measure drain leakage current iLimit amps Current limit compliance for the Model 2657A connected to the MOSFET drain terminal not applicable Integration time specified as the number of power line cycles An example of how to call this function is shown here Joke 10 1760 500 0 05 1006 97 5005 6 1
5. 1 Turn the navigation wheel to go to the character you want to change the character blinks when selected Press the navigation wheel to edit that character Turn the navigation wheel to change the value Press the navigation wheel to enter the change Repeat these steps as needed to change the value Press the ENTER key or the navigation wheel when finished changing all the characters g WK Q M To change a value using the numeric keypad 1 You must enable the keypad Press the MENU key then select DISPLAY gt NUMPAD gt ENABLE Use the CURSOR arrow keys to move the cursor to the value that you want to edit Press the number keys 0 9 0000 The cursor moves to the next value on the right Repeat the above steps as required to set the desired values Press the ENTER key to accept the value or press the EXIT LOCAL key to cancel the change Optional Press the EXIT LOCAL key to return to the main menu DAA Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 4 Using the web interface In this section nisl T T 4 1 Connecting to the instrument web interface 4 1 Web interface Nome page ii ree eec ies eth eae 4 2 IP comiguratom TAD mm oneni rai 4 3 ToB Embeddedi usse tl mast sac is s Eu 4 4 Reading e e m 4 7 TSP EXDIGSSi iiia enicnbonist ia iii 4 9 Introduction The Model 2657A web interface a
6. 1 1 0rc20 Serial Number 0000000 Description Keithley Instruments LXI Extended Functions LXI Version 1 4 LXI Core 2011 MAC Address 00 60 1A 00 8B 4E TCP IP Address 10 60 8 81 Gateway 10 60 8 1 Subnetmask 255 255 255 0 2 To create the example script in the TSP Script box enter the name of the TSP script basic source measure Figure 17 TSB Embedded page Keithley Instrume Test Script Builder Embedded User Scripts TSP Script basic source measure TP Exportto PC Import from PC Save Script vew Script l Restore Model 2657A defaults Console El Instrument Output smua nvbufferl clear smua nvbufferl appendmode 1 Abort Script Export Script to USB We wen Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com e Enter the code below in the script box Restore Model 2657A defaults smua reset Select voltage source function smua source func smua OUTPUT DCVOLTS Set source range to auto smua source autorangev smua AUTORANGE ON Set voltage source to 100 V smua source levelv 100 Set C r ene lamie ES ORMA smua source limiti 20e 3 Set current range to 20 mA smua measure rangei 20e 3 bin im HRH GET HE E S smua source o
7. A GREATER MEASURE OF CONFIDENCE LXI Web Interface Welcome Page Welcome Page IP Configuration Instrument Model Manufacturer Set Password Firmware Revision TSB Embedded Serial Number Reading Buffers Description Flash Upgrade LXI Extended Functions kannn LXI Version Log MAC Address TCP IP Address Gateway ID Subnetmask Lan Connection aoa 0 nann dls ene E dn tater nin itn eh ti To run TSP Express 1 From the navigation area on the left side of the web interface select TSP Express The TSP Express page is displayed 2 Click the Launch button The TSP Express window opens 3 There is a help pane on the right side of the TSP Express main window You can adjust the width of the help pane by sliding the vertical bar Click and follow the step by step example in the help pane to become familiar with TSP Express there is a link to the example in the TSP Express Introduction s first paragraph Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Figure 22 TSP Express P Keithley Instruments Inc TS Ani xi File Edit Instrument View Help maz y O E A auto navigate Index X Quick amp Easy I V Test TSP Express Introduction TSP Express is a utility that easily creates runnable scripts for the Keithley Instruments S
8. smua nvbuffer2 appendmode 0 smua nvbuffer2 collecttimestamps 1 smua nvbuffer2 collectsourcevalues 0 Configure source function smua source func smua OUTPUT DCVOLTS smua source levelv testV smua source limiti iLimit ee Configure measurement parameters Each call of the measurement function will result in the number of readings specified by smua measure count The time specified by smua measure delay is enforced before any measurements are mad all smua measure autozero smua AUTOZERO ONCE smua measure rangei measRang smua measure count numReadings smua measure nplc numNPLC smua measure delay soakTime Sal Run the test Turn on the output The programmed voltage is output immediately xl smua source output 1 f Perform a set of current and voltage measurements Measure delay is enforced befor measurements are mad EN smua measure iv smua nvbufferl smua nvbuffer2 After measurements are complete return the voltage to 0 V The rate of discharge is limited by programmed current limit sl smua source levelv 0 KI Wait until the capacitor is fully discharged before turning off the output all delay soakTime smua source output 0 end Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com This function prints the raw voltage and current measurements that are stored i
9. ma 4 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 5 Making basic front panel measurements In this section IRFOdUEIOM aspas T ODE 5 1 Equipment needed for this examiple cec 5 1 Device CONNECHONS c M 5 2 Making front panel measurements ssssssssss 5 4 Introduction You can use the Model 2657A to make basic measurements from the front panel In this example measurements are made on a 100 MQ resistor Similar measurements can be made on any two terminal device under test DUT if appropriate source values are used Equipment needed for this example To run this example you will need the following equipment Model 2657A High Power System SourceMeter instrument Additional cable and connector assemblies as required to make connections to the DUT See Device connections on page 5 2 for a schematic of required connections A 100 MO resistor to test enclosed in a safe test fixture such as the Keithley Instruments Model 8010 The resistor should be rated for at least 1000 V Appropriate cabling to the test fixture See Safe configuration and test setup on page 2 1 for additional connection information Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Device connections Connections from the Model 2657A to the DUT are
10. ssl function holdingCurr gateBiasCurr gateOnTime gateVoltLimit anodeBiasVolt anodeLatchingCurr anodeCurrStep numNPLC Initialize instruments and clear errors and status registers tsplink reset reset rrorqueue clear status reset Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Configure gate SMU node 2 smua source func node 2 smua OUTPUT DCAMPS node 2 smua source rangei gateBiasCurr node 2 smua source leveli gateBiasCurr node 2 smua source limitv gateVoltLimit node 2 smua source delay 0 Configure anode SMU source parameters smua source func smua OUTPUT DCVOLTS smua sense smua SENSE LOCAL smua source rangev anodeBiasVolt smua source levelv anodeBiasVolt smua source limiti anodeLatchingCurr This is the initial current limit to ensure that the device stays on after the gate cx Configure anode SMU measure parameters smua measure rangei anodeLatchingCurr smua measure nplc numNPLC smua measure autozero smua AUTOZERO ONCE numSteps anodeLatchingCurr 0 anodeCurrStep 1 if anodeCurrStep gt anodeLatchingCurr then print Wrong value The current step cannot be greater than or equal to the expected latching current else smua source output 1 node 2 smua source output delay gateOnTime node 2 smua source output 0 p for i
11. 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 1 Introduction In this section WECOME ninas osa 1 1 Extended WarTaliby 5 onecie Locaste pmi SS 1 1 Introduction Da Hae moarnilell ioi ea ccc cu esa eles 1 1 CD ROM Contei Siorcas 1 2 Organization of manual SectiONS oooocoononccnnnnocicononcccnanannnnnano 1 3 Application Biante 1 3 Welcome Thank you for choosing a Keithley Instruments product The Model 2657A High Power System SourceMeter Instrument provides manufacturers of electronic components and semiconductor devices with an instrument that combines source and measurement capabilities in a single instrument called a source measure unit also called a SMU This combination simplifies test processes by eliminating synchronization and connection issues associated with multiple instrument solutions A Model 26574 provides a scalable high throughput highly cost effective solution for precision DC pulse and high voltage source measure testing that also maintains code compatibility with the Series 2600A instruments Extended warranty Additional years of warranty coverage are available on many products These valuable contracts protect you from unbudgeted service expenses and provide additional years of protection at a fraction of the price of a repair Extended warranties are available on new and existing products Contact your local Keithley Instruments representative for details
12. Introduction to this manual This manual provides detailed tutorials to help you achieve success with your Keithley Instruments Model 2657A High Power System SourceMeter Instrument In addition this manual provides the basics of the two simplest Model 2657A interfaces the front panel and the web interface to familiarize you with the instrument You can also familiarize yourself with the instrument by running the examples in this manual that are relevant to your intended use and to the equipment you are using Some of the examples in this manual may use unfamiliar commands and concepts For detailed information about these refer to the Reference Manual part number 2657A 901 01 on the Product Information CD ROM that came with your instrument Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com CD ROM contents Two CD ROMs are shipped with each Series 2650A instrument The Series 2650A Product Information CD ROM Keithley Instruments part number 2650AS 950 01 Test Script Builder Integrated Development Environment CD ROM Keithley Instruments part number KTS 850 The Series 2650A Product Information CD ROM contains Quick Start Guide Provides unpacking instructions describes basic connections and reviews basic operation information If you are new to Keithley Instruments equipment refer to the Quick Start Guide to take the steps needed to unpack set up and verify operation Us
13. MA 02176 TestEquipmentDepot com SERIAL NO Using the Model 2657A in a custom test fixture or system You can use the Model 26574 safely with a properly designed custom test fixture or with a semiconductor device prober or handler A WARNING Connect the enclosure of all metal test fixtures to protective earth safety ground Nonconductive test fixtures must be rated to double the maximum capability of the test equipment in the system Failure to attach the ground wires to a known protective earth may result in electric shock Connecting the interlock of the Model 2657A The graphic below shows how the interlock pin controls the high voltage supply Figure 2 Interlock control of the high voltage power supply to 120V AC or Power supply for 240 V AC input eN display and interfaces 5 V DC out To external pin 22 interlock mechanism Interlock signal to firmware Interlock in pin 24 Coil resistance High voltage 100 ohms 10 power supply Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com The output of the Model 2657A can only be turned on when the interlock is engaged Attempting to turn on the output when the interlock is disengaged will generate error code 802 Output Blocked by Interlock The interlock is engaged when the interlock pin is pulled high through a switch to more than 4 V To drive the interloc
14. to complete editing Step 3 Select measurement function and range To select measurement function and range 1 Select the current measurement function by pressing the MEAS key as needed 2 Enable autorange by pressing the AUTO key the AUTO indicator lights Alternatively you can set manual ranging using the up or down RANGE keys Step 4 Turn output on Turn the output on by pressing the OUTPUT ON OFF control The OUTPUT indicator light turns on Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Step 5 Observe readings on the display Observe the readings on the display Press the TRIG key if necessary to trigger the instrument to begin taking readings The readings are on the top line and source and limit values are on the bottom line For the 100 MQ resistor typical display values are 10 0000uA SrcA 1000 00V LimA 100 000uA 1 Press the MEAS key several times to display measured voltage resistance power and current Typical values for the 100 MQ resistor are 1000 00 V 100 000 MOhm 10 000 mW and 10 0000 uA Step 6 Turn output off When finished turn the output off by pressing the OUTPUT ON OFF control The OUTPUT indicator light will turn off Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com
15. 09 Average voltage 1999 9 Insulator Resistance 1 23426e 12 Timestamps Current Voltage 0 1 652 05 199 9 05036699 1 652 09 1999 40 33397 1 631 09 1999 050095 14529 0909 1999 066793 1 658 09 1999 SOS MN BI OIONMNIRSOCOE LOOL 1 62a 09 1999 9 o116989 1 39 09 1999 9 1335897 ISOS 1999 9 SEIS TOM EH HET 19Y9 Y 0 0 0 O O ED CO GIG OOOO Sample data is shown in the following graphics The first graphic shows a typical capacitor leakage curve The second graphic shows the data that is actually returned by this example If you were to capture the complete current to time profile of the leakage current the data shown in the second graphic would occur further out on the x axis of the first graphic Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Figure 32 Typical capacitor leakage curve 1 00E 00 1 00E 01 1 00E 02 1 00E 03 1 00E 04 Current A 1 00E 05 1 00E 06 1 00E 07 1 00E 08 Figure 33 Sample data for capacitor leakage test 1 70E 09 1 65E 09 1 60E 09 1 55E 09 Current A 1 50E 09 1 45E 09 1 40E 09 1 2 3 4 5 6 7 8 9 10 NOTE The Model 2657A voltage source is stable into capacitance values of up to 10 uF typical on the 1500 V and 3000 V ranges See the latest Model 2657A specifications on the Keithley Instruments website for detail However if nois
16. 1 numSteps do smua measure i cmplCheck smua source compliance if cmplCheck false then break else smua source limiti anodeLatchingCurr i anodeCurrStep end end Complete the test and output the result smua source output 0 finalIh smua source limiti print Holding Current Amps finalIh end end Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Example usage The functions in this script allow updates to the test parameters without rewriting or re running the script To run the test call the holdingCurr function passing in the appropriate values for test parameters holdingCurr parameters Parameter umts SourceMeter instrument gateVoltLimit Voltage limit compliance for the Series 2600A connected to the thyristor s gate terminal anodeBiasVolt Anode voltage provided by the Model 2657A anodeLatchingCurr amps Specified latching current of the thyristor This is also the initial current limit compliance of the Model 2657A connected to the anode terminal The latching current is typically more than or equal to the holding current Ensure that this value is larger than holding current for this test anodeCurrStep The step size of the change in anode current numNPLC not applicable Integration time specified as number of power line cycles An example of how to call this function is shown here iolehueg euss 05 05 109 3
17. BVdss gateV drainI measDelay igLimit vdLimit numNPLC Tes lem eias CS SMS reset rrorqueue clear status reset tsplink reset t Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Configure source function node 2 smua source func node 2 smua OUTPUT DCVOLTS node 2 smua source levelv gateV node 2 smua source limiti igLimit smua source func smua OUTPUT DCAMPS smua source rangei drainI smua source leveli drainl smua source limitv vdLimit Configure measurement parameters smua measure rangev vdLimit smua measure nplc numNPLC smua measure delay measDelay Run the test node 2 smua source output 1 smua source output 1 I V smua measure iv smua source output 0 node 2 smua source output 0 aria Mies urmememics 10 print Measured voltage V end Example usage The function in this script allows updates to the test parameters without rewriting or re running the script To run the test call the BVdss function passing in the appropriate values for test parameters BVdss parameters Parameter fums peser gateV volts Gate voltage to apply with Series 2600A System SourceMeter Instrument Drain current forced by Model 2657A measDelay seconds Measurement delay after applying drain current and before measuring BVass gLimit amps Current limit for the Series 2600A SourceMeter Instrument connected
18. Discovery Browser Identifies the IP addresses of instruments connected to the local area network LAN that support VXI 11 discovery protocol For the latest drivers and additional support information see the Keithley Instruments website http www keithley com The Test Script Builder Integrated Development Environment CD ROM contains The installation files for the Test Script Builder Integrated Development Environment This software provides an environment in which you can develop a test program and the ability to load the test program onto the instrument Running a program that is loaded on the instrument eliminates the need to send individual commands from the host computer to the instrument when running a test Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Organization of manual sections This manual is organized into the following sections Safe configuration and test setup on page 2 1 Describes how to use the Model 2657A with the optional Keithley Instruments Model 8010 High Power Device Test Fixture or a custom test fixture or system Using the front panel interface on page 3 1 Describes the basics of using the front panel interface Using the web interface on page 4 1 Describes the basics of using the web interface Applications described below that provide detailed examples of how to use the Model 2657A Troubleshooting FAQs on page 10 1 Provides answer
19. Eb 00 Figure 4 High voltage triaxial to SHV coaxial cable assembly schematic HV triaxial connector SHV connector Cable Center conductor Center conductor Inner shield Outer shield Shield Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Be aware that when you connect the Model SHV CA 553 cable assembly to the SLO LO triaxial connector on the rear panel of the Model 2657A the LO terminal is the inner or first shield Therefore the LO terminal is not carried to the SHV end of the Model SHV CA 553 cable assembly Use the LO triaxial connector on the rear panel of the Model 2657A to access Output LO A WARNING f you need to convert from safe high voltage SHV to another connector type be sure to only adapt SHV connectors to connectors that are rated to the maximum possible voltage in your test setup If you use adapters that are not rated to the maximum possible voltage in your test setup electric shock may result Four wire connections to a test fixture with SHV connectors The following figure is an example that demonstrates the 4 wire connections from the Model 2657A to a resistor installed in a custom test fixture with SHV connectors Figure 5 Four wire connections to a custom test fixture with SHV connectors EN Lo Q _ Sense LO DUT HI Sense HI Test Equipment Depot 800 517 8431 99 Washington
20. Fixture see the Interconnect Reference Guide drawing Two terminal axial DUT with a Model 2657A connected for connections and the Model 8010 User s Manual drawing Model 2657A connections Figure 27 Two wire diode physical connections Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Simple reverse voltage sweep NOTE The example code is designed to be run from Test Script Builder or TSB Embedded It can also be run from other programming environments such as Microsoft Visual Studio or National Instruments LabVIEW However you may need to make changes to the example code to use other programming environments This example demonstrates a simple method that you can use to configure and execute a reverse voltage sweep on a diode and collect current measurements This example uses a Test Script Processor TSP script to perform the measurement The script includes two separate functions that configure the System SourceMeter Instrument and return the raw current and voltage readings that are stored in the reading buffer The script is written using Test Script Processor TSP functions rather than as a single block of inline code TSP functions are similar to functions in other programming languages such as Microsoft Visual C or Visual Basic They must be called before the code in them is executed Because of this running the script alone will not execute the test To exe
21. LO MAX Ht HI MAX rr Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com tom peson a ww 1 Model 2657A protective earth safety Additional connections for redundant protective ground earth may be required Keithley Instrument s Model CA 568 is a protective earth safety ground cable assembly 2 Interlock connection Model 26574 digital I O pin 24 INT and pin 22 5 VDC connected to the test fixture lid switch Keithley Instrument s Model 7709 308 is a 25 pin interlock male connector that can be used for custom connections Interlock switch is shown in the disengaged lid open position 3 Test fixture interlock switch connection 4 Interlocked metal safety enclosure A safety enclosure with an interlock that has a normally open NO switch 5 Test fixture protective earth safety Redundant grounds may be required for specific ground test setups Model HV CA 57 1 3 High Voltage See Using high voltage triaxial connectors on Triaxial Panel Mount Connector to page 2 7 for detail Unterminated Cable Assembly 7 Model HV CA 554 High Voltage 2 Triaxial Cable 8 Model 2657A 1 Figure 24 Physical connections for basic front panel measurement application Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Making fr
22. Model 2657A is connected from anode to cathode and performs a voltage sweep while capturing current measurements at each point of the sweep This example uses a TSP script to perform the measurement The script includes two separate functions for configuring the System SourceMeter Instrument and returning the raw current and voltage readings from the reading buffer The script is written using Test Script Processor TSP functions rather than as a single block of inline code TSP functions are similar to functions in other programming languages such as Microsoft Visual C or Visual Basic They must be called before the code in them is executed Because of this running the script alone will not execute the test To execute the test you need to run the script to load the functions into test script memory You then call the functions Refer to the documentation for Test Script Builder or TSB Embedded on page 4 4 for directions on how to run scripts and enter commands using the instrument console Example code Ll offVoltLeakI startV stopV numSteps measDelay measRange iLimit numNPLC Description This function can be used to determine Vdrm and Idrm or Vrrm and Irrm of a thyristor In this function the Model 2657A will perform a voltage sweep on the anode and measure the corresponding leakage current at each step As no voltage or current bias is required on the gate terminal of the thyristor this function can be used with gated
23. addresses of instruments that are connected to the LAN and that support the VXI 11 discovery protocol as required by LXI You can also manually set up the IP address Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com The Keithley LXI Discovery Browser is available on the instrument CD It is also available on the Keithley Instruments website htto www keithley com To locate the Keithley LXI Discovery Browser on the Keithley website 1 2 3 4 Select the Support tab In the model number box type 2657A From the list select Software and click the search icon A list of software applications for the instrument is displayed See the readme file included with the application for more information For more information about the LXI Consortium see the LXI Consortium website http www lIxistandard org To use the Keithley LXI Discovery Browser to identify IP addresses 1 2 3 4 From the Windows Start Menu select Keithley Instruments In the LXI Discovery Browser folder double click LXI Discovery Browser The tool should automatically identify the IP addresses of connected instruments If no IP addresses are shown click Refresh Double click the IP address in the Browser to open the web interface for the instrument To manually set up the IP address to connect the instrument to the web interface 1 2 Connect the Model 2657A to the LAN and confirm
24. and non gated devices To determine Vdrm and Idrm connect the Model 2657A from anode to cathode of the device and program positive start and stop voltages for the sweep To determine Vrrm and Irrm connect the Model 2657A from the anode to the cathode of the device and program negative start and stop voltages for the sweep Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Parameters Sitchin Vas STOPER numSteps Starting drain voltage Vds inal drain voltage Vds Number of points in the drain voltage sweep measDela y Measurement delay measRang Ligue S numNPLC Example usa for Vdrm an offVoltLeak for Vrrm an offVoltLeak s Current measurement range for the drain current measurements Current limit compliance for the drain current Integration time in number of power line cycles ge ol ielicineg 0 O SOL 5010 i00e9 6 le 3 1 Ql lies i 0 800 SOL O 010 3009 6 le 3 1 function offVoltLeakI startV stopV numSteps measDelay measRange iLimit numNPLC Wigs cabal ib reset Sig rrorqueue Status rese Configure smua nvbuff smua nvbuff smua nvbuff smua nvbuff smua nvbuff smua nvbuff clear t0 reading buffers erl clear rl appendmode 1 erl collecttimestamps 1 er2 clear r2 appendmode 1 er2 collecttimestamps 1 SO a smua source
25. paea a 9 2 Device connectlols csse aet Aa RE EA TOUR Mua MM Op MM RID ML CL MUS M i Di eLC S 9 3 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Varm and ldrm thyristor Measurements i eei too zazstasa sat sand 9 6 eeepc Em 9 6 Example dS dde cesi try te mee Repeat enter tip RM EUM IE QI E ee 9 8 Determine the holding current of a Thvrietor asse esse es sese ereer ee esse ereer rc 9 10 Example COJE isos ts uibs Miu iiL IU UD i iu d 9 10 Example USAC Suit di ide 9 12 Determine the latching current of a Thvrietor asse sese ee sese esse ee sees sees e sees ereenn nene 9 12 Example CONE eR diia calera ios 9 13 Example Usage cara 9 15 Troubleshooting FAQS icons aaa A did 10 1 PAOOUB MMS SCHON ura il dl rada sirio sn 10 1 How do change the line frequency or voOage7 sese ee esse ee esse eee eee seer enesenn ennenen 10 1 Where can I find updated sl o op oett ic ais 10 2 Can convert to coaxial cables turna 10 2 How do connect LO terminals of multiple SMUs together sese eee eee eee 10 2 What should do if get an 802 interlock GrTOEF coi e tr tere 10 3 Why is the reading v lug9 91897 ic 10 3 Why is the reading value 9 926897 onc ttt ntt er Enn E EnS EEEE SRNE 10 3 Next O 11 1 Additional Model 2657A Information sussies aiT aT 11 1 o isoon A S Index 1 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Test Equipment Depot
26. standard safety precautions to avoid personal contact with these voltages The N symbol on an instrument shows that the surface may be hot Avoid personal contact to prevent burns The 7 symbol indicates a connection terminal to the equipment frame If this symbol is on a product it indicates that mercury is present in the display lamp Please note that the lamp must be properly disposed of according to federal state and local laws The WARNING heading in the user documentation explains dangers that might result in personal injury or death Always read the associated information very carefully before performing the indicated procedure The CAUTION heading in the user documentation explains hazards that could damage the instrument Such damage may invalidate the warranty Instrumentation and accessories shall not be connected to humans Before performing any maintenance disconnect the line cord and all test cables To maintain protection from electric shock and fire replacement components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instruments Standard fuses with applicable national safety approvals may be used if the rating and type are the same Other components that are not safety related may be purchased from other suppliers as long as they are equivalent to the original component note that selected parts should be purchased only through Keithley Instruments
27. that the LAN light on the instrument is illuminated The LAN light is located on the rear panel as part of the LAN RJ 45 connector Open an Internet browser such as Microsoft Windows Internet Explorer version 6 0 or later only If you do not know the IP address press the MENU key on the instrument front panel and then select LAN gt STATUS gt IP ADDRESS In the Address box of the Internet browser enter the IP address of the instrument and press Enter The home page of the instrument web interface is displayed Web interface home page The Welcome page of the web interface gives you basic information about the instrument including The instrument model serial number firmware revision calibration date and LXI information An ID button to help you locate the instrument Links to the instrument web options including TSB Embedded Reading Buffers Flash Upgrade and TSP Express Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com IP configuration tab The IP Configuration tab provides access to the Model 2657A LAN settings Refer to the Model 2657A Reference Manual for additional information about IP configuration NOTE You must reload the page if you change the LAN settings from the Modify IP configuration page If the IP address changes due to automatic configuration mode or changing the setting to a different static IP address you must type the new IP address in th
28. the example code to use other programming environments This example demonstrates a simple method for measuring the leakage current and insulation resistance of a capacitor This example uses a TSP script to perform the measurement The script includes two separate functions for configuring the System SourceMeter Instrument and returning the raw current and voltage readings from the reading buffer The script is written using TSP functions rather than as a single block of inline code TSP functions are similar to functions in other programming languages such as Microsoft Visual C or Visual Basic They must be called before the code in them is executed Because of this running the script alone will not execute the test To execute the test you need to run the script to load the functions into test script memory You then call the functions Refer to the documentation for Test Script Builder or TSB Embedded for directions on how to run scripts and enter commands using the instrument console Example code function runCapleak testV iLimit measRange numReadings soakTime numNPLC IRE Se LL r SIMU reset errorqueue clear status reset Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Configure reading buffers smua nvbufferl clear smua nvbufferl appendmode 0 smua nvbufferl collecttimestamps 1 smua nvbufferl collectsourcevalues 0 smua nvbuffer2 clear
29. the gate trigger single pulse event anodeStartCurr Start value for the anode current sweep Typically slightly less than or equal to the holding current value anodeMaxCurr Stop value for the anode current sweep May not reach this value but this is the maximum value to source anodeStepCurr Step value for the anode current sweep anodeVoltLimit Voltage limit for the anode SMU Should be equal to Vdrm numNPLC Integration time in number of power line cycles Example usage SIE T cum O 060 10 1e 9 0 020 0 120 0 005 GOW 0 1 l function latchingCurr gateBiasCurr gateVoltLimit gateOnTime anodeStartCurr anodeMaxCurr anodeStepCurr anodeVoltLimit numNPLC Initialize instruments and clear errors and status registers tsplink reset reset rrorqueue clear status reset Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Configure gate SMU node 2 smua source func node 2 smua OUTPUT DCAMPS node 2 smua source rangei gateBiasCurr node 2 smua source leveli 0 node 2 smua source limitv gateVoltLimit node 2 smua source delay gateOnTim Configure anode SMU source parameters smua source func smua OUTPUT DCAMPS smua sense smua SENSE LOCAL smua source rangei anodeMaxCurr smua source leveli 0 smua source limitv anodeVoltLimit Configure anode SMU measurement param
30. to be used for leakage current measurement numReadings The number of measurements to make after the soak time applicable elapses this is the number of readings used to calculate the mean value Amount of time to apply the voltage before taking a measurement numNPLC not Integration time specified as the number of power line cycles applicable Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com An example of how to call this function is as follows cacas 20900 les 109 9 10 99 1 This call results in the charge of the capacitor under test to 2000 V The rate of charge of the capacitor is limited by the 1 mA current limit The soak time starts after the voltage source is programmed and elapses after 30 seconds Once the soak time has completed 10 current measurements are made on the 10 nA range at a 1 PLC integration rate After all measurements are complete the voltage source is again programmed to 0 V and the discharge is limited by the 1 mA current limit The soak time is again enforced to ensure adequate time to discharge the capacitor then the output is turned off You can use the printData function to return the voltage and current measurements and the timestamps that are stored in the buffer The data is formatted into three columns To call the printData function send printData An example of the summary of results that print is Average current 1 62033e
31. to maintain accuracy and functionality of the product If you are unsure about the applicability of a replacement component call a Keithley Instruments office for information To clean an instrument use a damp cloth or mild water based cleaner Clean the exterior of the instrument only Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument Products that consist of a circuit board with no case or chassis e g a data acquisition board for installation into a computer should never require cleaning if handled according to instructions If the board becomes contaminated and operation is affected the board should be returned to the factory for proper cleaning servicing Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Table of Contents Ini 1 1 Marvin HE E ME 1 1 Exon ea WANI y e tuiebisaesie atit ti pill SD III iia 1 1 Introduction to this MANWAl M nee ne erent een oer eres 1 1 CD ROM venil EE 1 2 Organization of manual SECCION iios cett ada dd 1 3 PDN CANONS A N Fed ontep pa acetone da ene Ae 1 3 Safe configuration and test Setup ssssssseeeeeeesssssseeee cesses ereenn nennen 2 1 Taise Here asia 2 1 Using the Model 2657A with the Model 8010 test fixture 2 1 Using the Model 2657A in a custom test fixture or system 2 3 Connecting the Interdock of thie Model 2087 eene tn Eo PEERS aiaa ER REI DATAE 2 3 Connecting the Model 2657A output t
32. to the MOSFET gate terminal dLimit volts Voltage limit compliance for the Model 2657A connected to the MOSFET drain terminal should be greater than or equal to the expected BV uss value not applicable Integration time specified as the number of power line cycles Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com An example of how to call this function is shown here weiss O 0 001 0 01 0 91 2000 1 This call applies O V to the FET gate terminal and programs the Model 2657A to force 1 mA into the drain terminal After 10 ms the drain voltage is measured up to 2000 V max The measurement is made at 1 PLC The actual drain current is also measured The measurement results are automatically printed at the completion of the test An example of the measurements results is Test current 9 99856e 04 Measured voltage 1 76940e 03 Idss measurement This example e Performs the lass measurement where the drain to source voltage Vas is swept and leakage current measurements are made while the FET is in the off state e Monitors the current measurement to see if the current limit has been reached When the current limit has been reached the voltage sweep is aborted With this method a second System SourceMeter is used to apply a voltage from gate to source Vgs This example uses a TSP script to perform the measurement The script includes two separate functions for config
33. vous nvbufferl smua clear smua appendmod smua nvbufferl collecttimes smua nvbuffer2 clear smua nvbuffer2 HDR EE E appendmod smua collecttimes Configure source paramet node 2 smua source func node 2 smua source levelv 1 tamps 1 1 tamps 1 rs for the gate SMU node 2 smua OUTPUT DCVOLTS node 2 smua source limiti a SOMO taa source paramet func smua OUT smua source levelv 0 smua source limiti iLimit if math abs startV math smua source rangev sta else smua source rangev sto end smua Source gece 0 001 rs for the drain SMU PUT DCVOLTS abs stopV then rtV pV Configure measurement parameters for the drain SMU smua measure rangei measRang smua measure nplc numNPLC smua measure delay measDelay step voltage startV smua source levelv voltag Run the test node 2 smua source output smua source output 1 delay 1 for i 1 numSteps do smua measure iv smua nvb Remove the following 4 for compliance testCmpl smua source c if testCmpl true then break end smua source levelv vol voltage voltage step end stov starty oston Serio 15 e 1 ufferl smua nvbuffer2 lines if you do not want to monitor ompliance tage step abite y Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com numNPLC
34. 0 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Set up communication The communication setup is illustrated in the following diagram This application can be run using any of the supported communication interfaces for the instruments For additional detail about remote communications see Communications interfaces in the Model 2657A Reference Manual Figure 38 Remote interface and TSP Link communications setup Controller Model 2657A TSP Link Node 1 Remote interface connection ctam TSP Link Model 2611A Model 2612A Model 2635A or Model 2636A TSP Link Node 2 Wepemm C IEEE 488 connection L GPIB Model 2657A is IEEE Std 488 1 compliant LAN connection Model 2657A is LXI version 1 4 Core 2011 compliant It supports TCP IP and complies with IEEE Std 802 3 ethernet 10 or 100 Mbps This is available from Keithley Instruments see Model CA 180 3 LAN Crossover Cable NOTE For the first example no TSP Link connections are required because only the Model 2657A at TSP Link node 1 is used Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Device connections Refer to the following figures to connect the thyristor in a safe test fixture See Safe configuration and test setup on page 2 1 for information on safely connecting the Model 2657A to a device under test DUT A CAUTION If a device under test fa
35. 1 99 Washington Street Melrose MA 02176 TestEquipmentDepot com What should do if get an 802 interlock error You will receive error code 802 OUTPUT blocked by interlock if you e Disengage the interlock when the Model 2657A output is already on e Attempt to turn on the Model 2657A output when the interlock is disengaged To recover from this error properly engage the interlock using a safe test fixture and then turn on the Model 2657A output Why is the reading value 9 91637 This value indicates that there is a measurement overflow error This error occurs when e A measurement performed on a fixed range has a measured value greater than the specified range e The measured value is larger than the maximum current or voltage range of the instrument exceeds the instrument rating If the instrument displays the overflow message on a particular range select a higher range until an on range reading is displayed To ensure the best accuracy and resolution use the lowest range possible that does not cause an overflow Why is the reading value 9 92e37 This value indicates an overvoltage condition This can occur if e The overvoltage protection OVP limit value is exceeded e There are incorrect connections to the device under test DUT e Remote sense is enabled and the sense HI and sense LO are improperly or incorrectly connected to the DUT The OVP limit can be set from the Model 26574 front panel or through a remote inte
36. 1 steps After each source step a 10 ms delay occurs and then the Model 2657A makes a 1 NPLC current measurement on the 100 pA range The current limit is set to 1 mA All current and voltage measurements are automatically printed to the communication interface at the conclusion of the test An example of the output of this test is shown in the graphic below Figure 42 Sample output Vrrm Reverse Off State Current vs Reverse Off State Voltage 0 00E 00 1 00E 03 2 006 03 3 00E 08 4 00E 08 Reverse Off State Current Irrm 5 00E 08 5 00E 08 Reverse Off State Voltage Vrrm Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Determine the holding current of a thyristor This example determines the holding current of a thyristor The holding current is the minimum DC current at which the thyristor turns off after the gate signal is removed Two SourceMeter instruments are required for this example One SourceMeter instrument triggers the thyristor to turn on by supplying a current to the thyristor s gate terminal Once triggered the gate signal is removed The Model 2657A applies a voltage bias to the thyristor s anode with an initial current limit greater than or equal to the specified latching current of the thyristor This ensures that it stays in the on state after the gate signal is removed The current limit is gradually decreased until the device
37. 2 125 006 93005 1 This function call uses the Series 2600A SourceMeter Instrument to apply 50 mA for 2 s to trigger the thyristor to turn on Meanwhile the Model 2657A applies 12 V to the anode with an initial current limit of 60 mA Since the device is in the on state the Model 2657A should be in current limit The current limit is decreased in 5 mA increments The program monitors the current limit bit of the status register in order to determine when the Model 2657A returns to normal voltage sourcing conditions which indicates that the device has turned off This final programmed current limit is the holding current The result of the function call for this example is Holding Current Amps 2 40000e 02 Determine the latching current of a thyristor This example determines the latching current of a thyristor The latching current is the minimum DC anode current at which the device remains in the on state after the gate signal is removed Two SourceMeter instruments are required for this example The Series 2600A SourceMeter Instrument provides a repetitive square wave like signal to the gate to trigger and re trigger the device The Model 2657A supplies current to the thyristor s anode Each time the gate is removed the program checks the Model 2657A voltage limit to determine if the device is on If the device has not stayed on the anode current is increased and the device is re triggered This process continues until the thyristor rem
38. 5 2 3 rias EPI HIER eens 7 2 Devic CONMECHONS ERE EE ETT ETE 7 2 Measuring leakage current and insulation resistance 7 4 Introduction This example demonstrates how to use the Model 2657A High Power System SourceMeter Instrument to measure the leakage current and calculate the insulation resistance of a capacitor In this example 1 The capacitor is charged to the desired voltage 2 The voltage is held across the capacitor for a user specified amount of time 3 The current is measured 4 The Model 2657A discharges the capacitor using the programmed current limit Equipment required Equipment required One Model 2657A High Power System SourceMeter Instrument One GPIB or Ethernet cable to connect the Model 2657A to a computer One high voltage capacitor enclosed in a safe test fixture such as the Keithley Instruments Model 8010 Appropriate cabling to connect the Model 26574 to the test fixture Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Set up communication The communication setup is illustrated in the following figure This application can be run using any of the supported communication interfaces for the instrument For additional detail about remote communications see Communications interfaces in the Model 2657A Reference Manual Figure 29 Communication connections Controller Model 2657A TSP Link Node 1 Remote interface co
39. B Embedded to run the application examples in other sections of this manual If you can access the web interface home page but cannot use TSB Embedded or TSP Express make sure you have the Java SE Runtime Environment JRE Version 6 or later installed on your computer Create a script using TSB Embedded NOTE If you are using TSB Embedded to create scripts you do not need to use the commands loadscript or loadandrunscript and endscript Exercise Create and run a script with TSB Embedded The following programming example illustrates the setup and command sequence of a basic Source measure procedure with the following parameters e Source function and range voltage autorange e Source output level 1000 V e Current compliance limit 10 mA e Measure function and range current 20 mA To create and run a sample script with TSB Embedded 1 From the navigation on the left side of the web interface select TSB Embedded The TSB Embedded page is displayed Figure 16 Select TSB Embedded KEITHLEY A GREATER MEASURE OF CONFIDENCE LXI Web Interface Welcome Page Welcome Page Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com IP Configuration Set Password TSB Embedd Reading Buffers Flash Upgrade TSP Express Log Glossary Instrument Model 2657A System Sourc Manufacturer Keithley Instruments Firmware Revision
40. Interlocked metal safety enclosure 5 Test fixture protective earth safety ground 1 1 1 1 1 3 Test fixture interlock switch connection Triaxial Panel Mount Connector to Unterminated Cable Assembly 7 Model HV CA 554 High Voltage 4 Triaxial Cable ka Protective earth safety ground for the Model 2657A PM 200 Ml a 7 Module 2657A PM 200 for more information AO Assembly 11 Series 2600A System SourceMeter Instrument Model 2636A 12 Wdezsz 1 If you are using a Model 8010 High Power Test Fixture see the Interconnect Reference Guide drawing Three terminal DUT with a Model 2657A Also see the Model 8010 User s Manual for Model 2657A Model 2611A and Model 2612A connections Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Figure 40 Connections for gated thyristor application example Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Vdrm and Idrm thyristor measurements NOTE The example code is designed to be run from Test Script Builder or TSB Embedded It can also be run from other programming environments such as Microsoft Visual Studio or National Instruments LabVIEW TM However you may need to make changes to the example code to use other programming environments This example performs the Varm and lam measurements and may also be used to determine V m and Im The
41. Section 6 Measuring diode off state breakdown In this section Iag ias 6 1 EduipmentrequirSd TT 6 1 Setup communication 5 iri Mie eR 75795 6 2 Device connections sacos iioi ostes tis esie ds sasceessitesdsecantestin ist aci 6 3 Simple reverse voltage sweep eee eee eee eee eee eee eee e 6 5 Advanced reverse voltage SWEEP issirinksi 6 9 Introduction This example demonstrates how to use the Model 2657A to measure the reverse breakdown characteristics of a high voltage diode The Model 2657A measures the leakage current as the reverse voltage is swept to the specified breakdown voltage of the diode There are two examples in this section The first example demonstrates the simplest method This method configures a sweep using a programmatic for loop The second example demonstrates a more advanced method for configuring this measurement by using the Model 2657A trigger model to run the sweep This method is useful in the following situations e f you require very precise timing either for source or measurement e f you are using a Model 2657A in a multi instrument setup and you need to receive or output trigger signals to other instruments or device handlers Equipment required Equipment required e One Model 2657A High Power System SourceMeter Instrument e One GPIB or Ethernet cable to connect the Model 2657A to a computer e One high voltage diode enclosed in a safe test fixture such as the Keithley Instruments Mod
42. See Using coaxial connections SHV on page 2 4 for detail How do connect LO terminals of multiple SMUs together To connect the SENSE LO and LO terminals of the Model 2657A to other source measure units SMUS use the Model 2657A LIM 3 LO Interconnect Module For more details refer to the Model 2657A LIM 3 LO Interconnect Module documentation PA 1063 NOTE If you are connecting to a lower voltage SMU you must first connect the lower voltage SMU to a Keithley Instruments Model 2657A PM 200 Protection Module using triaxial connections only Compatible lower voltage SMUs include the Models 2611A 2612A 2635A 2636A 4200 SCS 4200 SMU and 4210 SMU For more information about the Model 2657 A PM 200 protection module refer to the Model 2657A PM 200 Protection Module documentation PA 1055 A WARNING The Model 2657A High Power System SourceMeter Instrument and its associated cabling are designed to be safe when operated correctly in a 3000 V system They are only warranted to the maximum voltage and current ratings of the instrument Connect ng two Model 2657A instruments in parallel or in series may result in voltages or power levels that exceed the safety mechanisms This increases the risk of instrument damage and the possibility of personal injury or death due to electric shock The user assumes all of the associated risks of combining the outputs of two or more Model 2657A instruments Test Equipment Depot 800 517 843
43. Street Melrose MA 02176 TestEquipmentDepot com tom peston 1 Model 2657A protective earth safety ground Additional connections for redundant protective earth may be required Keithley Instrument s Model CA 568 is a protective earth safety ground cable assembly 2 Interlock connection 1 Model 26574 digital I O pin 24 INT and pin 22 5 VDC connected to the test fixture lid switch Keithley Instrument s Model 7709 308 is a 25 pin interlock male connector that can be used for custom connections Interlock switch is shown in the disengaged lid open position E Test fixture interlock switch connection 4 Interlocked metal safety enclosure 5 Test fixture protective earth safety ground Sense HI HI LO and sense LO panel mount SHV connections Model SHV CA 553 High Voltage A safety enclosure with an interlock that has a normally open NO switch Redundant grounds may be required for specific test setups Customer supplied Triaxial to SHV Cable 8 Model 2657A AS Figure 6 Physical four wire connections to a test fixture with SHV connectors Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Using high voltage triaxial connectors You may use the Keithley Instruments HV CA 571 3 cable assembly to create custom test fixtures or systems with panel mount high voltage triaxial connectors Use the HV CA 554 cable assemblies to connect the Mode
44. Test Equipment 99 Washington Street Ata Depot Melrose MA 02176 Phone 781 665 1400 1 800 517 8431 Toll Free 1 800 517 8431 LJ Visit us at www TestEquipmentDepot com User s Manual 2657A 900 01 Rev A April 2012 A GREATER MEASURE Oo F GON TE IDE seis Model 2657A High Power System Sourcemeter Instrument User s Manual 2012 Keithley Instruments Inc Cleveland Ohio U S A All rights reserved Any unauthorized reproduction photocopy or use the information herein in whole or in part without the prior written approval of Keithley Instruments Inc is strictly prohibited TSP TSP Link and TSP Net are trademarks of Keithley Instruments Inc All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand names are trademarks or registered trademarks of their respective holders The Lua 5 0 software and associated documentation files are copyright 1994 2008 Tecgraf PUC Rio Terms of license for the Lua software and associated documentation can be accessed at the Lua licensing site http www lua org license html Document number 2657A 900 01 Rev A April 2012 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com KEITHLEY Safety Precautions The following safety precautions should be observed before using this product and any associated instrumentation Although some instruments and ac
45. The Instrument Output box displays any error messages and output from the script 10 If no errors appear but readings do click Run a few times to populate the buffer Each time the script is run readings appear in the Instrument Output box and are also placed in the buffer Script management options Existing scripts are listed in the User Scripts box on the left side of TSB Embedded To run a script click the name of the script and then click Run To delete a script click the name of the script and click Delete The script is deleted from the User Scripts list and from the nonvolatile memory of the instrument To stop operation of a script click Abort Script To export the selected script to the computer click Export to PC Choose the directory in which to save the script and click Save Scripts are saved to a file with the extension tsp TSP files are native to Test Script Builder or TSB Embedded but they can be opened and edited in any text editor To import scripts from the computer click Import from PC Select the directory that contains the file You can only import files with the extension tsp To clear the name box and the box that contains the script click Clear To view the contents of a script type the name of a script in the TSP Script box and click View Script Reading buffers The Reading Buffers tab provides access to the Model 2657A reading buffers The data used in this example was created and placed in th
46. ains on even after the gate signal is removed The first anode current at which this occurs is the latching current Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Example code exert latchingCurr gateBiasCurr gateVoltLimit gateOnTime anodeStartCurr anodeMaxCurr anodeStepCurr anodeVoltLimit numNPLC Description This function can be used to determine Ilatch of a thyristor Two SMUs are required for this function One SMU node 2 smua is connected to the gate terminal and is used to trigger the device The Model 2657A smua is connected to the anode and is used to source the current The gate is triggered while a current bias is applied to the anode Ihe gate current is removed and measurements are made to verify that the device sus on Li the device as Off the current at the anode as increased and the gate is re triggered This continues until the device remains on even after the gate signal is removed The current at which the device remains on is the latching current a In order to complete this task custom list sweeps are configured on the gate and anode SMUs Parameters gateBiasCurr Current to apply to the gate to trigger the device on Should be greater than or equal to the gate trigger current gateVoltLimit Voltage limit for the gate SMU Should be greater than or equal to the gate trigger voltage gateOnTime Number of seconds to apply
47. allows for source and system settling measRange amps Current range on which to perform the leakage current measurements iLimit Current limit compliance for the Model 2657A numNPLC not applicable Integration time specified as the number of power line cycles An example of how to call this function is shown here itowe Wioben cum elie SEE LESS 10 SOC 591 0 01 1006 8 19 93 i This function call programs the Model 2657A to sweep from 0 V to 800 V in 501 steps After each source step a 10 ms delay occurs and then the Model 2657A makes a 1 NPLC current measurement on the 100 pA range The current limit is set to 1 mA All current and voltage measurements are automatically printed to the communication interface at the conclusion of the test Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com The data that results is shown in the following graphic Figure 41 Thyristor measurement sample output Off State Current vs Off State Voltage HUE y sl 7 00 05 6 00E 03 5 00 03 4 0DE 03 Of State Current jA S 00E 05 2 00E 05 1 006 03 OOH T n 100 200 300 400 500 600 700 Ba aco Off State Voltage Vdem v Another example of how to call this function is shown here ito Weim Bisel icine puesWAelulewesr 0 800 501 0 010 1002 6 le 53 1 This function call programs the Model 2657A to sweep from 0 V to 800 V in 50
48. cessories would normally be used with nonhazardous voltages there are situations where hazardous conditions may be present This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury Read and follow all installation operation and maintenance information carefully before using the product Refer to the user documentation for complete product specifications If the product is used in a manner not specified the protection provided by the product warranty may be impaired The types of product users are Responsible body is the individual or group responsible for the use and maintenance of equipment for ensuring that the equipment is operated within its specifications and operating limits and for ensuring that operators are adequately trained Operators use the product for its intended function They must be trained in electrical safety procedures and proper use of the instrument They must be protected from electric shock and contact with hazardous live circuits Maintenance personnel perform routine procedures on the product to keep it operating properly for example setting the line voltage or replacing consumable materials Maintenance procedures are described in the user documentation The procedures explicitly state if the operator may perform them Otherwise they should be performed only by service personnel Service personnel are traine
49. cute the test you need to run the script to load the functions into test script memory You then call the functions Refer to the documentation for Test Script Builder or TSB Embedded on page 4 4 for directions on how to run scripts and enter commands using the instrument console Example code Exe EE DiodeRL vstart vstop vstep irange ilimit Description This function uses a for loop to configure a reverse voltage sweep on a diode and collect leakage current measurements This demonstrates a very simple method of performing a linear voltage sweep on the Model 2657A Parameters vstart The starting voltage of the diode reverse voltage sweep vstop The stopping voltage of the diode reverse voltage sweep vstep The step voltage of the diode reverse voltage sweep how much the voltage changes per step irange current measurement range set to a value or set to auto to enable autorange ilimit The current limit of the voltage source Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Additional notes Source delay is automatically added to each point of this sweep because the smua source levelv command is used Source delay varies by voltage range INE cas timing it tas SOuUMCS ls ecxirlcal o wou euploeeigm please use the DiodeRL Swp function instead Example usage DiodeRL 0 1000 100 100e 9 0 01 mele function DiodeRL vstart vstop v
50. cuted Because of this running the script alone will not execute the test To execute the test you need to run the script to loa d the functions into test script memory You then call the functions Refer to the documentation for Test Script Builder or TSB Embedded on page 4 4 for directions on how to run scripts and enter commands using the instrument console Example code Sep Title FET Drain Source Breakdown Voltage Description This script measures the drain source breakdown voltage BVdss of a FET BVdss gateV drainI measDelay igLimit vdLimit numNPLC Description This function uses the Model 2657A to force a current from drain to source The SMU also measures the resulting voltage Vds with the FET channel turned off A second System SourceMeter Instrument applies the gate to source voltage Vgs to ensure that the gate is turned off Parameters gateV Applied gate voltage Vgs drainI Test current applied by the Model 2657A from drain to source Id measDelay Measurement delay before making the drain voltage measurement Vgs igLimit Current limit compliance for the SMU connected to the FET gate terminal vdLimit Voltage limit compliance for the SMU connected to the FET drain terminal numNPLC Integration time for the drain voltage measurement in number of power line cycles Example usage Ewelee 0 49001 05 01 4501 2000 1 function
51. d to work on live circuits perform safe installations and repair products Only properly trained service personnel may perform installation and service procedures Keithley Instruments products are designed for use with electrical signals that are rated Measurement Category and Measurement Category ll as described in the International Electrotechnical Commission IEC Standard IEC 60664 Most measurement control and data I O signals are Measurement Category and must not be directly connected to mains voltage or to voltage sources with high transient overvoltages Measurement Category II connections require protection for high transient overvoltages often associated with local AC mains connections Assume all measurement control and data I O connections are for connection to Category sources unless otherwise marked or described in the user documentation Exercise extreme caution when a shock hazard is present Lethal voltage may be present on cable connector jacks or test fixtures The American National Standards Institute ANSI states that a shock hazard exists when voltage levels greater than 30 V RMS 42 4 V peak or 60 VDC are present A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring Operators of this product must be protected from electric shock at all times The responsible body must ensure that operators are prevented access and or insulated from every connection point In som
52. e address bar of your Internet browser before you can use the web interface again KEITHLEY A GREATER MEASURE OF CONF Welcome Page IP Configuration Set Password TSB Embedded Reading Butters Flash Upgrade TSP Express Log DENCE LXI Web Interface Welcome Page instrument Model 2657 System SourceMater Manufacturer Keithley Instruments Firmware Revision 110720 Serial Number 0000000 Description Keithley Instruments SMU 26574 0000000 Li Extended Functions DJ Varsion 1 4 LXI Cora 2011 mac Address 00 50 14 00 584 TCPAP Address 10608 81 Gateway 105081 Subnetmask 255 255 255 0 Lan Connection 100s Full ple Host Hame FQDN 10 50 8 81 k 2657A 0000000 local ONS Servers DST 5030 Raw Socket 5025 Telnet 23 0 11 Core 1 24 Ports TCP beard 10 60 8 81 5025 S0CKET GPlB baard 26 INSTR ASRL bend IHSTR TCP board 10 60 8 81 inst0 INSTR Smu A Calibration Date Smu A Calibration Dus Instrument Address String Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com TSB Embedded TSB Embedded is a web application that includes a command line interface that you can use to issue commands and interact with the instrument TSB Embedded also provides a convenient way to create and manage user scripts TSB Embedded resides in the instrument You can use TS
53. e buffer by the Exercise Create and run a script with TSB Embedded on page 4 4 Exercise Retrieve readings from a buffer To retrieve readings from a populated buffer 1 From the navigation area on the left side of the web interface select Reading Buffers The Reading Buffers embedded page is displayed Figure 18 Select reading buffer KEITHLEY A GREATER MEASURE OF CONFIDENCE LXI Web Interface Welcome Page Welcome Page IP Configuration Set Password TSB Embedded Reading Buffers Flash E TSPO Express Log Glossary Instrument Model 2657A System Sourc Manufacturer Keithley Instruments Firmware Revision 1 1 0re20 Serial Number 0000000 Description Keithley Instruments LXI Extended Functions LXI Version 1 4 LXI Core 2011 MAC Address 00 60 14 00 8B 4E TCP IP Address 10 60 8 81 Gateway 10 60 8 1 Subnetmask 255 255 255 0 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com 2 From the left box 1 in the following graphic select smua nvbufferl 3 In the Recall Attributes area near the bottom of the page shown as 2 in the following graphic select Values and Time Stamp 4 Click Download shown as 3 in the following graphic Figure 19 Downloading the reading buffer Keithley Instruments Readi
54. e cases connections must be exposed to potential human contact Product operators in these circumstances must be trained to protect themselves from the risk of electric shock the circuit is capable of operating at or above 1000 V no conductive part of the circuit may be exposed f Do not connect switching cards directly to unlimited power circuits They are intended to be used with impedance limited sources NEVER connect switching cards directly to AC mains When connecting sources to switching cards install protective devices to limit fault current and voltage to the card Before operating an instrument ensure that the line cord is connected to a properly grounded power receptacle Inspect the connecting cables test leads and jumpers for possible wear cracks or breaks before each use When installing equipment where access to the main power cord is restricted such as rack mounting a separate main input power disconnect device must be provided in close proximity to the equipment and within easy reach of the operator For maximum safety do not touch the product test cables or any other instruments while power is applied to the circuit under test ALWAYS remove power from the entire test system and discharge any capacitors before connecting or disconnecting cables or jumpers installing or removing switching cards or making internal changes such as installing or removing jumpers Do not touch any object that could provide a current pa
55. el 8010 High Power Test Fixture Device e Appropriate cabling to connect the Model 2657A to the test fixture Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Set up communication The communication setup is illustrated in the following figure This application can be run using any of the supported communication interfaces for the instrument For additional detail about remote communications see Communications interfaces in the Model 2657A Reference Manual Figure 25 Communication connections Controller Model 2657A TSP Link Node 1 N Remote interface connection Wepemm 7 m m 1 IEEE 488 connection GPIB Model 2657A is IEEE Std 488 1 compliant 2 LAN connection 1 Model 2657A is LXI version 1 4 Core 2011 compliant It supports TCP IP and complies with IEEE Std 802 3 ethernet 10 or 100 Mbps This is available from Keithley Instruments see Model CA 180 3 LAN Crossover Cable RS 232 connection 1 Serial communication port Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Device connections Refer to the following figure to connect the diode in a safe test fixture See Safe configuration and test setup on page 2 1 for information on safely connecting the Model 2657A to a device under test DUT Figure 26 Two wire diode connections Model 2657A OMEN
56. ent required e One Model 2657A High Power System SourceMeter Instrument e One Series 2600A System SourceMeter Instrument Model 2611A Model 2612A Model 2635A or Model 2636A e f needed cables to connect the Series 2600A SourceMeter Instrument to the protection module s f needed cables to connect the protection module to the test fixture e f a Model 2611A or Model 2612A is being used one Model 2600 TRIAX adapter e f you are not using a Model 8010 High Power Device Test Fixture you need a Model 2657 A PM 200 Protection Module to ensure that the lower voltage Series 2600A SourceMeter Instrument is protected if the device under test fails e One GPIB or Ethernet cable to connect the Model 2657A to a computer e One high voltage MOSFET device enclosed in a safe test fixture such as the Keithley Instruments Model 8010 e Appropriate cabling to connect the Model 2657A the test fixture Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Set up communication The communication setup is illustrated in the following diagram This application can be run using any of the supported communication interfaces for the instruments For additional detail about remote communications see Communications interfaces in the Model 2657A Reference Manual Figure 34 Remote interface and TSP Link communications setup Controller Model 2657A TSP Link Node 1 123456789 Remote interface con
57. er s Manual Provides application examples If you need a starting point to begin creation of applications refer to the User s Manual for a variety of specific examples Reference Manual Includes advanced operation topics and maintenance information Programmers looking for a command reference and users looking for an in depth description of the way the instrument works including troubleshooting and optimization should refer to the Reference Manual Model 8010 High Power Test Fixture Interconnection Reference Guide A quick reference for making typical test connections using the optional Model 8010 test fixture Model 8010 High Power Test Fixture User s Manual Provides complete connection information and sample applications for the optional Model 8010 test fixture Accessories information Documentation for available accessories Model 2657A TSB Add in Additional tools for the Test Script Builder Integrated Development Environment TSB including Model 2657A specific examples and help files Drivers and release notes IVI Instrument Driver National Instruments LabVIEW driver and related release notes J2SE Runtime Environment Web browser plug in that is required to run the web applications that are available through the instrument web interface Keithley I O layer and release notes The Keithley I O layer manages communications between Keithley Instruments drivers and software applications and the Model 2657A Keithley LXI
58. eries 2600A I1 SourceMeter Instruments SMU Click dites for a quick step by step example TSP Express may be launched via a web link from any Series 2600A Quick Start Tools instrument or by using a shortcut on the PC See launching the application for more details Single SMU sweeps and measurements View or change instrument configuration The start up screen is the TSP Express project wizard It provides a menu of choices for building new test scripts as well as options for opening existing projects and scripts It also allows the user to view or change instrument configurations The start up screen is shown whenever TSP Express is launched or when an existing project is closed File gt Close Project To work 3 with scripts or projects select from the Outline view of script following options Multiple SMU sweeps and measurements Open an existing project Basic Sequential SDM Source Delay Measure Open an existing script OE Advanced Sequential SDM New script a com FET Sweep Example Project Quick Start the choices in this section help quickly get started creating scripts B le SMU sweeps and measurements Create a simple project with a single functional segment to generate basic voltage dii it Thi KEITHLEY is useful fortwo terminal device characterization and A GREATER MEASURE OF CONFIDENCE similar applications
59. eters smua measure delay 0 005 Must have delay if you want reasonable anode measurements smua measure rangev anodeVoltLimit smua measure nplc numNPLC smua measure autozero smua AUTOZERO ONCE smua nvbufferl clear smua nvbuffer2 clear smua nvbufferl appendmode 1 smua nvbuffer2 appendmode 1 smua nvbufferl collecttimestamps 1 smua nvbuffer2 collecttimestamps ll as Create custom sweeps for anode and gate SMUs numSwpPts 2 anodeMaxCurr anodeStartCurr anodeStepCurr 1 gateSwp anodeSwp for i 1 numSwpPts do if math mod i 2 0 then gateSwp i 0 else gateSwp i gateBiasCurr end end for j 1 numSwpPts 2 do anodeSwp j anodeStartCurr j 1 2 anodeStepCurr anodeSwp j 1 anodeStartCurr j 1 2 anodeStepCurr end Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com smua source output 1 node 2 smua source output 1 for k 1 numSwpPts 2 do smua source leveli anodeSwp k node 2 smua source leveli gateSwp k node 2 smua source leveli gateSwp k 1 smua measure iv smua nvbufferl smua nvbuffer2 checkCmpl smua source compliance velt If in compliance then device is off If out of compliance then device is on and we have reached latching current Al if checkCmpl false then finalIL anodeSwp k break end end node 2 smua source outpu
60. ety ground cable assembly y 2 Interlock connection 1 Model 2657A digital I O pin 24 INT and pin 22 5 VDC connected to the test fixture lid switch Keithley Instruments Model 7709 308 is a 25 pin interlock male connector that can be used for custom connections Interlock switch is shown in the disengaged lid open position 3 Test fixture interlock switch 1 connection A safety enclosure with an interlock that has a normally open NO switch 4 Interlocked metal safety enclosure 1 5 Test fixture protective earth safety 1 Additional connections for redundant grounds may ground be required for specific test setups Model HV CA 571 3 High Voltage See Using high voltage triaxial connectors on page Triaxial Panel Mount Connector to 2 7 Unterminated Cable Assembly 7 Model HV CA 554 High Voltage 4 Triaxial Cable 8 Model 2657A X LL 9 Panel mount SHV connectors Customer supplied 10 Model SHV CA 553 High Voltage 2 Triaxial to SHV Cable Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Figure 31 Two wire capacitor physical connections Measuring leakage current and insulation resistance NOTE The example code is designed to be run from Test Script Builder or TSB Embedded It can also be run from other programming environments such as Microsoft Visual Studio or National Instruments LabVIEW However you may need to make changes to
61. evice under test DUT A CAUTION If a device under test fails high voltage may be present at a terminal to which Series 2600A instruments are connected This could damage a Series 2600A instrument To prevent damage to the Series 2600A instrument use a Model 2657A PM 200 Protection Module Failure to use a protection module could result in equipment damage Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Figure 35 Schematic for measuring MOSFET characteristics application example To Model 263xA Interlock pin 24 Digital ground pin 19 7 LO Model 2657A 3030 VDC GUARD SENSE LO MAX HI HI ER To test fixture Interlock pin 24 Digital ground pin 19 Le s Ground symbols Protective earth safety ground Digital Model 263xA CHANNELA SENSE HI ORO LINE FUSE LINE RATING Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com 1 Model 2657A protective earth safety ground Additional connections for redundant protective earth may be required Keithley Instrument s Model CA 568 is a protective earth safety ground cable assembly Test fixture interlock switch connection 4 Interlocked metal safety enclosure 1 5 Test fixture pro
62. ey mean Indicator Meaning EDIT Instrument is in editing mode ERR Questionable reading or invalid calibration step REM Instrument is in remote mode TALK Instrument is addressed to talk LSTN Instrument is addressed to listen SRQ Service request is asserted REL Relative mode is enabled FILT Digital filter is enabled AUTO Source or measure autorange is selected asterisk Readings are being stored in the buffer The navigation wheel Turn the navigation wheel to scroll to a menu option or to change the selected value Push the navigation wheel to open menus or to select a menu option or a value In most cases pressing the navigation wheel performs the same action as pressing the ENTER key The OUTPUT ON OFF control Press this control to turn the Model 2657A source output on or off The output indicator will light when the source is on Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com 5 The setup and control keys These keys provide front panel control and configuration The following figure illustrates each key s location The table following the figure contains a definition of each key Figure 15 Setup and control keys 2 09 o Gump Guam 4 gt CONFIG LOCAL i 2 3 0000 O Key descriptions DISPLAY Toggles between the source measure displays and the user message mode CONFIG Configures a function or operation H Selects the source functio
63. f a capacitor Measuring MOSFET characteristics on page 8 1 Two examples demonstrate how to use the Model 2657A to measure the drain to source breakdown voltage and leakage current of a MOSFET These tests perform the BV measurement and lass measurements Measuring thyristor DC characteristics on page 9 1 Three examples demonstrate how to use the Model 2657A to characterize several DC characteristics of gated thyristors Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 2 Safe configuration and test setup In this section INFOdUCION me TE 2 1 Using the Model 2657A with the Model 8010 test fixture 2 1 Using the Model 2657A in a custom test fixture or system 2 3 Introduction The Model 2657A can generate hazardous voltages It is intended for use with a test fixture or in a test system that has safety mechanisms in place to prevent an operator from accessing these voltages This section describes how to use the Model 2657A with e The optional Keithley Instruments Model 8010 High Power Device Test Fixture e A custom test fixture or system Using the Model 2657A with the Model 8010 test fixture The Model 8010 test fixture is designed to safely and easily interface to the Model 2657A for quick testing of a variety of packaged devices Only o
64. ils high voltage may be present at a terminal to which Series 2600A instruments are connected This could damage a Series 2600A instrument To prevent damage to the Series 2600A instrument use a Model 2657A PM 200 Protection Module Failure to use a protection module could result in equipment damage Figure 39 Schematic for gated thyristor application example Model 2657A SENSE 3030 VDC GUARD SENSE Lo LO MAX HI HI Series 2600A SENSE CHANNEL A SENSE LO HI LO HI MW LINE FUSE LINE RATING Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com tom peson a wwe 1 Model 2657A protective earth safety Additional connections for redundant protective ground earth may be required Keithley Instrument s Model CA 568 is a Interlock connection protective earth safety ground cable assembly Model 26574 digital I O pin 24 INT and pin 22 5 VDC connected to the test fixture lid switch Keithley Instrument s Model 7709 308 is a 25 pin interlock male connector that can be used for custom connections Interlock switch is shown in the disengaged lid open position A safety enclosure with an interlock that has a normally open NO switch Redundant grounds may be required for specific test setups Model HV CA 57 1 3 High Voltage 4 See Using high voltage triaxial connectors on page 2 7 4
65. ith the Model 2657A contains a separate ground wire for use with grounded outlets When proper connections are made the instrument chassis is connected to power line ground through the ground wire in the power cord Ensure that the protective earth safety ground terminal is properly connected to a known protective earth safety ground before operating the instrument Failure to use a grounded outlet may result in personal injury or death due to electric shock A CAUTION Operating the instrument on an incorrect line voltage may cause damage to the instrument possibly voiding the warranty Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Front panel The front panel of the Model 2657A is shown below Figure 14 Front panel 1 The POWER switch Press this switch to turn the instrument on Press it again to turn the 2 3 4 x instrument off O The display During operation the display provides readings and information about the selected measurement and configuration It also shows the control status local or remote If REM is displayed the instrument is being controlled remotely through GPIB LAN or RS 232 If REM is not displayed control is through the front panel During setup the display shows menu choices that you can use to configure the instrument The items listed below represent the possible display indicators and what th
66. ixture see the Interconnect Reference Guide drawing Three terminal DUT with a Model 2657A Also see the Model 8010 User s Manual for information on how to connect the instrument to the fixture Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Figure 36 Measuring MOSFET characteristics application example connections BVdss measurement NOTE The example code is designed to be run from Test Script Builder or TSB Embedded It can also be run from other programming environments such as Microsoft Visual Studio or National Instruments LabVIEW However you may need to make changes to the example code to use other programming environments This example performs the Bv uss measurement The Model 2657A forces a current from the drain to source terminals and measures the resulting Vas This example uses a TSP script to perform the measurement The script includes two separate functions for configuring the System SourceMeter Instrument and returning the raw current and voltage readings from the reading buffer Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com The script is written using Test Script Processor TSP functions rather than as a single block of inline code TSP functions are similar to functions in other programming languages such as Microsoft Visual C or Visual Basic They must be called before the code in them is exe
67. k pin high the external supply must supply a minimum of 50 mA The interlock is disengaged when the signal applied is less than 4 V The absolute maximum input is 0 4 V to 6 0 V The interlock is intended for use through a normally open switch which may be installed on the lid of a test fixture on the enclosure of a semiconductor prober or device handler or on the door or doors of a test equipment rack Connecting the Model 2657A output to a custom test fixture Keithley Instruments offers several accessories that can help you when building a custom test fixture or system You can use high voltage coaxial or triaxial connectors on your test fixture The following sections show you how to connect from the Model 2657A to the custom fixture and also how to make connections to the device inside the custom fixture Using coaxial connections SHV You may need to adapt connections from the Model 26574 to safe high voltage SHV coaxial connections in your test system For this situation you can use the Keithley Instruments Model SHV CA 553 high voltage triaxial to SHV cable assemblies NOTE The inner shield of the high voltage triaxial connector is not carried to the SHV connector end The result of this is that portions of the test setup are unguarded This can increase source and measurement settling time It can also degrade low current measurement performance Figure 3 High voltage triaxial to SHV cable assembly SHV CA 553
68. l 2657A to these custom test fixtures Figure 7 Connect to custom test fixtures with the HV CA 571 3 cable assembly Test fixture _ Eb Jp dp To Model 2657A HV CA 554 High Voltage Triaxial Cable The HV CA 571 3 is supplied with one unterminated end It is intended to be used in a safe enclosure To properly connect the unterminated end to points in your test circuit ensure proper voltage spacing for the maximum possible voltage in your test system For 3000 V ensure these spacings Figure 8 Voltage spacing RSS I RORY XX SOM Peed 00 L Q d KA X XN AN tom Beserition Outer jacket Outer shield 3 Inner shield Spacing between the inner shield and any user accessible circuit 33 5 mm spacing between the inner shield and a metal enclosure if used 16 75 mm e And any user accessible circuit 33 5 mm s Anda metal enclosure if used 16 75 mm Center conductor Spacing between the center conductor First dielectric 6 Second dielectric 7 Inner jacket With wrapped tape barrier Minimum spacing between inner and outer shield 16 75 mm Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Please note how the above spacing requirements relate to the output terminals of the Model 2657A Figure 9 Model 2657A HI and SHI terminals Sense HI Output HI Follow all spacing requirements as described in Using high voltage triaxial co
69. llmode smua FILL ONC Define local variable for index of the for loop local Ia SSN Gm lee CESE o smua source output 1 Sol Use a for loop to run the linear voltage sweep and make current and voltage measurements za for L a 0 1_mumPoimes 1 clo Update the source level Sima source levely sexi Jb s wees Make simultaneous voltage and current measurements smua measure iv smua nvbufferl smua nvbuffer2 end Set the voltage level back to 0 V smua source levelv 0 vicio One las OE SE smua source output 0 end 2401 This function prints the data from the smua nvbufferl and smua nvbuffer2 reading buffers into three separate tab delimited columns se function printData if smua nvbufferl n 0 then print No readings in buffer else print Timestamps tCurrent tVoltage for i 1 smua nvbufferl n do print string format gNt gNt g smua nvbufferl timestamps i smua nvbufferl readings i smua nvbuffer2 readings i end end end Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Example usage The functions in this script allow updates to the test parameters without rewriting or re running the script To run the test call the DiodeRL function passing in the appropriate values for test parameters DiodeRL parameters Parameter Units Description vstart Start voltage for the linear voltage sweep vste
70. llows you to review instrument status control the instrument and upgrade the instrument over a LAN connection The instrument web page resides in the firmware of the instrument Changes you make through the web interface are immediately made in the instrument Many examples in this manual and in the Model 2657A Reference Manual can be run through the TSB Embedded page of the instrument web interface Connecting to the instrument web interface NOTE The instrument web interface requires the web browser plug in Java SE Runtime Environment Version 6 or later The latest version of the plug in is available from http www java com en download manual jsp http www java com en download manual jsp Installation files are also available on the Model 2657A Product Information CD ROM that came with your instrument The instrument web interface uses Java applets and depending on your browser security settings may require your permission to download and install them To connect to the instrument web interface you must have a LAN connection from the computer to the instrument See LAN concepts and settings in the Model 2657A Reference Manual for more information about configuring the Model 2657A for a LAN connection connecting the Model 2657A to the LAN and establishing a LAN connection to the instrument Once the Model 2657A is configured correctly and connected to the LAN you can use the Keithley LXI Discovery Browser to identify the IP
71. n V or A and places the cursor in the source field for editing MEAS Cycles through measure functions V A O or W S LIMIT Places the cursor in the compliance limit field for editing Also selects the limit value to edit V A or W Directly controls the mode DIGITS Cycles through display resolution 4 5 or 67 digits y C EL Selects either the fast or integrating analog to digital converter ADC When the integrating ADC is selected this key also sets the measurement speed and accuracy by controlling the measurement aperture R Controls relative measurements This allows a baseline value to be subtracted from a reading FILTER Enables or disables the digital filter You can use this filter to reduce reading noise LOAD Loads a test for execution RUN Runs the last selected factory or user defined test code STORE Accesses reading buffers and takes readings RECALL Recalls data or statistics from CHANA BUFF1 or CHANA BUFF2 TRIG Triggers readings Accesses the main menu The main menu can be used to configure many facets of operation EXIT Cancels the selection and backs out of the menu structure Also used as a LOCAL LOCAL key to take the instrument out of remote operation ENTER Accepts the current selection or opens the next menu option In most cases pressing the ENTER key is the same as pressing the navigation wheel o Number When enabled the number keys 0 9 0000 allow direct numeric en
72. n reading buffers smua nvbufferl and smua nvbuffer2 18 function printData Retrieve average values of measured current and voltage MINOS MESS ea i Sima Obie Ote cst LS sita vob vola estas Stm Dut Ter Sis tents Smua s MONE 1E E32 currontimoani CS ns cas Meat voltage mean voltage stats mean Calculate the insulation resistance of the capacitor resistance voltage mean current mean Print the summary of the results to the communication interface Jose suene string Torment MAVSIcaCGS Current wel Current meza print string format Average voltage g voltage mean print string format Insulator Resistance g resistance if smua nvbufferl n 0 then print No reading in buffer else print Timestamps tCurrent tVoltage for i 1 smua nvbufferl n do print string format g t g t g smua nvbufferl timestamps il smua nvbufferl readings i smua nvbuffer2 readings i end end end Example usage The functions in this script allow updates to the test parameters without rewriting or re running the script To run the test call the runCapLeak function passing in the appropriate values for test parameters runCapLeak parameters Parameter Units Description The voltage level to test the capacitor with iLimit amps Current limit compliance for the test This limits the rate of charge and discharge of the capacitor measRange amps Current measurement range
73. ne Model 2657A may be connected to the Model 8010 However you can connect other Keithley SourceMeter Instruments SMUs to the Model 8010 for testing multi pin devices See the Model 8010 User s Manual for a list of supported instruments The Model 8010 provides a safety interlock for up to six SMUs including the Model 2657A Opening the test fixture lid disables the output of any SMU that can produce hazardous live voltages more than 42 Vosax Closing and latching the lid enables testing with hazardous voltages To connect the safety interlock from the Model 8010 to the Model 2657A use the CA 558 2 cable assembly This cable is supplied with the Model 8010 The cable assembly connects the safety interlock pins on the digital I O connector of the Model 2657A to any one of the Series 26xxA Interlock connectors on the rear panel of the Model 8010 See Model 8010 to Model 2657A rear panel connections on page 2 2 for connection details A WARNING The Model 2657A is provided with an interlock circuit that must be positively activated in order for the high voltage output to be enabled The interlock helps facilitate safe operation of the equipment in a test system Bypassing the interlock could expose the operator to hazardous voltages that could result in personal injury or death Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com To connect the Model 2657A output to the Model 8010 use o
74. nection ctam TSP Link Model 2611A Model 2612A Model 2635A or Model 2636A TSP Link Node 2 Wepemm 7 me IEEE 488 connection GPIB Model 2657A is IEEE Std 488 1 compliant 2 CA 180 3 1 Model 2657A is LXI version 1 4 Core 2011 compliant It supports TCP IP and complies with IEEE Std 802 3 ethernet 10 or 100 Mbps This is available from Keithley Instruments see Model CA 180 3 LAN Crossover Cable To set the TSP Link node number using the front panel interface 1 Press the MENU key Select TSPLink Select NODE Use the navigation wheel to adjust the node number Press the ENTER key to save the TSP Link node number Qu me oum Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com On the Model 2657A SMU 1 TSP Link node 1 perform a TSP Link reset to update it with the linked instruments 1 Press the MENU key 2 Select TSPLink 3 Select RESET NOTE If error 1205 is generated during the TSP link reset ensure that the Series Model 2657A has a unique TSP Link node number You can also perform a TSP Link reset from the remote command interface by sending tsplink reset to the Model 2657A This method is used in the example program Device connections Refer to the following figure to connect the MOSFET in a safe test fixture See Safe configuration and test setup on page 2 1 for information on safely connecting the Model 2657A to a d
75. ng Buffers Help C E Reading Number Reading J mua nvbufferl smua nvbuffer2 RECALL ATTRIBUTES 3 DOWNLOAD Measurement Source Other J Functions L Functions _ Values J Statuses Status Details L Ranges U Ranges _J Output States I Time Stamp 5 The table displays the present buffer data Notice that the Source Value column is not populated To collect source values before taking readings use TSB Embedded to set the following attribute smua nvbufferl collectsourcevalues 1 Figure 20 Sample downloaded reading buffer Source Value TimeStam 0 0 2 06658101081 3 89714288711 4 Reading Number Readin smua nvbuffer1 1 1 46675048995 2 1 46675048995 1 10057605695 smua nvbuffer1 3 smua nvbuffer2 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com TSP Express The TSP Express tab provides access to the TSP Express Launch page From this page click the Launch button to start TSP Express NOTE Only one web application can be running and connected to the instrument at a time TSP Express will not run if another web application such as TSB Embedded Reading Buffers or Flash Upgrade is running and connected to the instrument If you need to run another web application be sure to close TSP Express before starting the other web application Figure 21 Select TSP Express KEITHLEY
76. nly Model HV CA 554 high voltage triaxial cable assemblies See the following figure for connections Be sure to connect the Model 8010 to protective earth safety ground using the screws on its rear panel A WARNING The ground wires must be attached to a known protective earth safety ground before powering on instruments Failure to attach the ground wires to a known protective earth may result in electric shock Refer to the Model 8010 User s Manual for additional details Figure 1 Model 8010 to Model 2657A rear panel connections MODELS 2657A 2600A AND 4200 5MU CONNECTIONS o ET 4200 4200 SMU GND 2651A 2 26514441 Ea pvissocwx UNT 40V 15A DC 50A PULSE MAX 40V 15A DC 50A PULSE MAX seNSEIGUARD meur nso n Do O O giis Oo mms Loe Y L ong sane ese we PULSE 1 DUTY CY 2657A SH HI LOSL SH HI LOSL ix C 2500092 Loanne 4200 o 26XXA o AN N 210V 1 5A DC 210V 1 5A DC d N INTERLOCK L OCK Em e 10A PULSE MAX 10A PULSE MAX C e ITI TT Th PULSE 1 DUTY CYCLE e KEITHLEY MADE IN USA a a WARNING NO INTERNAL OPERN R SERVINASLE PARTS o a SERVICE BY QUALIFINQNERSONNQONLY p Connect ground cable c CA 568 120 lugs to protective earth LO and sense LO HV CA 554 Interlock cable CA 558 2 U Test Equipment Depot 800 517 8431 99 Washington Street Melrose
77. nnection gt Item Description Y Notes S IEEE 488 connection GPIB Model 2657A is IEEE Std 488 1 compliant LAN connection 1 Model 2657A is LXI version 1 4 Core 2011 compliant It supports TCP IP and complies with IEEE Std 802 3 ethernet 10 or 100 Mbps This is available from Keithley Instruments see Model CA 180 3 LAN Crossover Cable RS 232 connection 1 Serial communication port Device connections Refer to the following figure to connect the capacitor in a safe test fixture See Safe configuration and test setup on page 2 1 for information on safely connecting the Model 2657A to a device under test DUT For connections if you are using a Model 8010 High Power Test Fixture see the Interconnect Reference Guide drawing Two terminal axial DUT with a Model 2657A connected and the Model 8010 User s Manual drawing Model 2657A connections Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Figure 30 Two wire capacitor connections Model 2657A Lo SENSE 3030 VOC GUARD SENSE 250v ORAA Ht HI MAX f T 7 2 t 2 HV triaxial to E SHV cables 2 tom peserpion Ta Model 2657A protective earth safety Additional connections for redundant protective earth ground may be required Keithley Instrument s Model CA 568 is a protective earth saf
78. nnectors on page 2 7 For the Sense LO and LO terminals the center conductor and first shield should be within a few volts of each other to guarantee normal operation Therefore there is minimal space required between these two conductors Figure 10 Model 2657A Sense LO and output LO terminal Sense LO Figure 11 Model 2657A LO terminal A WARNING Connections to LO on the Model 2657A are not necessarily at 0 V Hazardous voltages could exist between LO and chassis ground Make sure that high voltage precautions are taken throughout the test system Alternatively limit hazardous levels by adding external protection to limit the voltage between LO and chassis Failure to make sure high voltage precautions are used throughout the test system or a failure to limit hazardous levels could result in severe personal injury or death from electric shock Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Four wire connections to a test fixture with HV triaxial connectors The following graphic demonstrates 4 wire connections from the Model 2657A to a resistor in a custom test fixture that uses Keithley Instruments high voltage triaxial connectors NOTE You may need additional connections for redundant protective earth safety ground that are not shown in the following graphic A WARNING Hazardous voltages may be present on all output and guard terminals To prevent elec
79. nt 4 7 stopping 4 7 viewing 4 7 SHV coaxial 2 4 Source level 5 4 T triaxial connections 2 7 troubleshooting 10 1 FAQs 10 1 IP address 4 1 4 3 line frequency 10 1 voltage 10 1 web page 4 1 4 2 TSB Embedded 4 4 script create with 4 4 TSP Express 4 9 V voltage source set level 5 4 W Warranty 1 1 web interface 4 1 accessing 4 1 browser requirements 4 1 Home page 4 2 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com
80. o a custom test fixture esses 2 4 Four wire connections to a test fixture with HV triaxial Connectors see ee eee e 2 9 Using th front panel interface secans a 3 1 Introduction ssl alli tl oa 3 1 a 3 2 Pl cing a Model 2657A 1n StaMEDY 2c2cassschcaiaes oracion ORUM bacon ca be ER DR En OUS 3 4 Changing values trom the front panel 5 5 etate sens ese eec Rn 3 4 Using th web IIA e C 4 1 este erc sana os 4 1 Connecting to the instrument web InteriaGg sese e sese sees e sese ee esse eser rre 4 1 Web interface Nome Page eT 4 2 IP COMMUTATION MAD m TD 4 3 ToB Embedded oriei isun eed ia scena Enea P Rc Exe redd Re Ce eva A ER 4 4 Create a script Using TSB Embedded iio rire Eee 7542222422925920 25927529 asians 4 4 Exercise Create and run a script with TSB Embedded isisisi iinei 4 4 FREACING DUES stars 4 7 Exercise Retrieve readings from a DUffer ciiin iiiter aiii aa 4 7 TSPUJEXDIGSS Jaco ies attt D tI deett Id REN IMEEM tU idu Ee i im EU M IUIS 4 9 Making basic front panel measurements cesser ereer 5 1 MOOG UIC IO MEE ni S TD 5 1 Equipment needed for this example sese ee ee eee ee eee eee 5 1 Device connechiONS m E 5 2 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Making trontspanel measurements sein aa 5 4 Procedure for making front panel measurements sse 5 4 Measuring diode off state breakdown
81. ode terminal The gate signal is removed by programming the Model 2600A to force zero amps The program monitors the voltage limit on the Model 26574 If the voltage limit is indicated the device is off The Model 2657A then increases the supplied anode current and the device is re triggered This process is repeated until the thyristor remains on This final programmed current limit is the latching current The result of the function call for this example is Latching Current Amps 2 90000e 02 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 10 Troubleshooting FAQs In this section L eH S SS CHO pete c 10 1 How do change the line frequency or voltage 10 1 Where can find updated drivers sees essere eee 10 2 Can I convert to coaxial cables isisisi 10 2 How do connect LO terminals of multiple SMUs together 10 2 What should do if get an 802 interlock error 10 3 Why is the reading value 9 91637 sees 10 3 Why is the reading value 9 92637 spem 10 3 About this section The purpose of this section is to help you troubleshoot the most common problems encountered with the Model 2657A For additional troubleshooting information please see the Troubleshooting section in the Model 2657A Reference Manual How do change the line frequency or voltage need to use a Model 2657A at a differen
82. oltage sweep on a diode and collect current measurements The trigger model is useful when critical timing is required or when the Model 2657A must send or receive triggers from an external instrument or device handler This example does not configure any incoming or outgoing trigger signals For more information on the trigger model see the Model 2657A Reference Manual Example code zur DiodeRL Swp vstart vstop vstep irange ilimit sourceDelay Description This function uses the trigger model and built in Sweeping function to create a linear voltage sweep to measur the reverse leakage of a diode Using this method is useful when there is a need to send or receive external triggers from another instrument or device handler Parameters vstart The starting voltage of the diode reverse voltage sweep vstop The stopping voltage of the diode reverse voltage sweep vstep The step voltage of the diode reverse voltage sweep how much the voltage changes per step irange current measurement range set to value or set to auto to enable autorange ilimit The current limit of the voltage source sourceDelay The delay between the start of source and the Source complet vent Example usage Dukgrekerub Swol 1000 10 1008 9 0 01 05 05 11 function DiodeRL Swp vstart vstop vstep irange ilimit sourceDelay Reset and initialize instrument reset status reset
83. ont panel measurements Use the following procedure to configure the instrument and make measurements from the front panel NOTE If you see error code 802 OUTPUT blocked by interlock the interlock is not engaged To recover from this error properly engage the interlock using a safe test fixture and then turn on the Model 2657A output Procedure for making front panel measurements Step 1 Select and set source level Perform the following steps to select the voltage source and set its value to 1000 V 1 Press the SRC key as needed to select the V Source as indicated by the units in the source field on the display The flashing digit cursor indicates which value is selected for editing 2 Move the cursor to the digit to change then press the navigation wheel to enter the EDIT mode as indicated by the EDIT indicator 3 Use the RANGE keys to select the 1500 V range If using a different source value use the lowest possible range for the best accuracy 4 Set the source value to 1000 00 V and then press the ENTER key or the navigation wheel to complete editing Step 2 Set compliance limit Perform the following steps to edit the compliance limit value to 100 uA 1 Press the LIMIT key 2 Move the cursor to the digit to change then press the navigation wheel to enter the EDIT mode as indicated by the EDIT indicator 3 Enter the limit value of 100 00 uA 4 Press the ENTER key or the navigation wheel
84. p Step voltage for the sweep irange Current measurement range ilimit Current limit compliance An example of how to call this function is shown here vstop Stop voltage for the linear voltage sweep DiodeRL 0 1000 10 100e 9 0 01 This call results in a 101 point linear voltage sweep starting at O V and proceeding to 1000 V in 10 V increments The current measurement range is set to 100 nA and the current limit is set to 10 mA You can use the printData function to return the stored voltage and current measurements and the timestamps The data is formatted into three columns Here is an example of how to call the printData function printData An example of the output is shown here NOTE The connections that were made to the device were set up so that when a positive voltage was sourced the device was reverse biased The voltage readings were negated before graphing Figure 28 Results of sample data for diode breakdown characteristics Reverse Leakage on 1000V Diode r M T T M r IDEA 1200 1000 800 600 400 200 2 00E 09 400E C9 E 00E 09 o0E c9 Current Aj 1 00608 1 AIE LH 1 40808 150EC8 1 onc ca Voltage V Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Advanced reverse voltage sweep This example demonstrates how to use the trigger model of the Model 26574 to perform a reverse linear v
85. rface To set the OVP limit from the instrument front panel 1 Press the CONFIG key and then select SRC V SOURCE PROTECTION 2 Enter the desired OVP value 3 Press Enter To set the OVP limit through a remote interface use the smuX source protectv attribute see the Command reference section in the Model 2657A Reference Manual for details about this command For more information about overvoltage protection see Overvoltage protection OVP in the Model 2657A Reference Manual Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 11 Next steps In this section Additional Model 2657A information eeeeessse 11 1 Additional Model 2657A information For additional information about the Model 2657A refer to e The Product Information CD ROM which ships with the product Contains software tools drivers and product documentation e The Keithley Instruments website http www keithley com Contains the most up to date product information from the website you can access e The Knowledge Center where you can order the following handbooks e The Low Level Measurements Handbook Precision DC Current Voltage and Resistance Measurements e Switching Handbook A Guide to Signal Switching in Automated Test Systems e Applica
86. rrorqueue clear Configure source function as 2W DCVOLTS smua source func smua OUTPUT DCVOLTS smua sense smua SENSE LOCAL Define a local variable to store the number of points in the sweep local 1 numPoints Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Ul Calculate the number of points in the sweep based on the start and stop values xdi if math abs vstart math abs vstop then Sua source frangey vstart else smua source rangev end 1 numPoints math abs vstop vstart vstep 1 Set up source delay smua source delay sourceDelay vstop Set up current compliance smua source limiti ilimit Set up current measurement range if irange auto then smua measure autorangei smua AUTORANGE ON elise smua measure autorangei smua AUTORANGE OFF smua measure rangei irang end Set the integration time smua measure nplc 1 Configure the reading buffers smua nvbufferl clear smua nvbufferl appendmode 0 smua nvbufferl collecttimestamps 1 smua nvbufferl collectsourcevalues 0 El smua nvbufferl fillmode smua FILL ONC smua nvbuffer2 clear smua nvbuffer2 appendmode 0 smua nvbuffer2 collecttimestamps 1 smua nvbuffer2 collectsourcevalues 0 El smua nvbuffer2 fillmode smua FILL ONC Configure the source sw smua trigger source linearv vstart vstop l n
87. s to frequently asked questions to help you troubleshoot common problems encountered with the Model 2657A Next steps on page 11 1 Provides information about additional resources that can help you use the Model 2657A Bookmarks for each section are provided in the PDF version The manual sections are also listed in the Table of Contents located at the beginning of this manual For more information about bookmarks see Adobe Acrobat or Reader help Applications In addition to being a stand alone instrument the Keithley Instruments Model 2657A can intelligently connect to other instruments and multiple devices This manual provides application examples that guide you through several common instrument to instrument scenarios These applications are presented after the summary information about the Model 26574 and include Making basic front panel measurements on page 5 1 Demonstrates the basic measurement function using a single Model 2657A and a two terminal device under test DUT Measuring diode off state breakdown on page 6 1 Two examples demonstrate how to use the Model 2657A to measure the reverse breakdown characteristics of a high voltage diode The Model 2657A measures the leakage current as the reverse voltage is swept to the specified breakdown voltage of the diode Measuring capacitor leakage on page 7 1 Demonstrates how to use the Model 2657A to measure the leakage current and calculate the insulation resistance o
88. shown in the illustrations on the following pages Proper care should be taken to ensure good contact through all connections A WARNING The information in this topic is intended only for qualified service personnel Some of the procedures may expose you to hazardous voltages that could result in personal injury or death Do not attempt to perform these procedures unless you are qualified to do so Hazardous voltages may be present on all output and guard terminals To prevent electrical shock that could cause injury or death never make or break connections to the Model 2657A while the instrument is powered on Turn off the equipment from the front panel or disconnect the ma n power cord from the rear of the Model 2657A before handling cables Putting the equipment into standby does not guarantee that the outputs are powered off if a hardware or software fault occurs Guard voltage can be hazardous With an unguarded device under test DUT connection terminate the guard before the end of the cable Refer to High voltage triaxial cable termination for details Connect the enclosure of all metal test fixtures to protective earth safety ground see your specific test fixture for information Nonconductive test fixtures must be rated to double the maximum capability of the test equipment in the system Figure 23 Connections for basic front panel measurement application Model 2657A Lo SENSE 3030 VDC GUARD SENSE 250V LO
89. smua source smua source smua Source Configure smua measur Source parameters for the drain SMU func smua OUTPUT DCVOLTS levelv 0 limiti iLimit oJ mumeew SENA measurement parameters for the drain SMU Smua measur rangei measRang e nplc numNPLC Smua measur Smua measur delay measDelay autozero smua AUTOZERO ONCE step stopV startV numSteps 1 voltage startV Run the test smua source output 1 Tor ir I smua mea smua sou voltage end Test Equipment Dep numSteps do sure iv smua nvbufferl smua nvbuffer2 rce levelv voltage step voltage step ot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Run the test smua source levelv 0 smua source output 0 printData end function printData if smua nvbufferl n 0 then print No reading in buffer else print Timestamps tVoltage tCurrent for i 1 smua nvbufferl n do print string format gNt gNt g smua nvbufferl timestamps i smua nvbuffer2 readings i smua nvbufferl readings i end end end Example usage The function in this script allows updates to the test parameters without rewriting or re running the script To run the test call the of fVoltLeakI function passing in the appropriate values for test parameters offVoltLeakl parameters measDelay seconds Measurement delay prior to making a measurement
90. specific ground test setups Model HV CA 571 3 High Voltage 3 See schematic for connections Refer to Using Triaxial Panel Mount Connector to high voltage triaxial connectors on page 2 7 Unterminated Cable Assembly 7 Model HV CA 554 High Voltage 3 Triaxial Cable 8 Model 2657A Figure 13 Model 2657A four wire connections remote sensing physical connections 1 1 A safety enclosure with an interlock that has a 1 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 3 Using the front panel interface In this section WME OE UO EOI iustos dashes i Ev ERE FER RUE LEO Cone PER ERIT Doreen ku pua MU 3 1 Sel ae Ta ee 3 2 Introduction Before starting this section complete the tasks outlined in the Model 2657A Quick Start Guide Once you have completed those tasks read this section which provides enough basic information about the Model 2657A front panel interface to work through the examples provided in this manual The front panel of the Keithley Instruments Model 2657A contains the following items POWER switch Display The navigation wheel e The setup and control keys You can use the keys display and the navigation wheel to access view and edit the menu items and to set values For additional information about the front panel see the General operation section in the Model 2657A Reference Manual A WARNING The power cord supplied w
91. step irange ilimit Reset and initialize instrument reset status reset rrorqueue clear Configure source function as 2W DCVOLTS smua source func smua OUTPUT DCVOLTS smua sense smua SENSE LOCAL Define local variable to store the number of points in the sweep local l numPoints Calculate the number of points based on the start and stop values of the sweep E if math abs vstart math abs vstop then Smua source rangewv veLtart 1 numPoints vstart vstop vstep 1 else smusg source ro ngev stop 1l numPoints vstop vstart vstep 1 end Set up current compliance smua source limiti ilimit Gus up current range if irange auto then smua measure autorangei smua AUTORANGE ON elise smua measure autorangei smua AUTORANGE OFF smua measure rangei irang end Set the measurement integration time smua measure nplc 1 smua measure delay 0 05 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Configure the reading buffers smua nvbufferl clear smua nvbufferl appendmode 1 smua nvbufferl collecttimestamps 1 smua nvbufferl collectsourcevalues 0 les smua nvbufferl fillmode smua FILL ONC smua nvbuffer2 clear smua nvbuffer2 appendmode 1 smua nvbuffer2 collecttimestamps 1 smua nvbuffer2 collectsourcevalues 0 El smua nvbuffer2 fi
92. strument to characterize several DC characteristics of gated thyristors There are three examples in this section The first example performs measurements of peak forward off state blocking voltage Varm and its corresponding leakage current larm It can also be used to measure the peak reverse block voltage Vim and its corresponding leakage current lnm The second example determines the holding current of the thyristor The third example determines the latching current of the thyristor Equipment required for this example Equipment required One Model 2657A High Power System SourceMeter Instrument One Series 2600A System SourceMeter Instrument Model 2611A Model 2612A Model 2635A or Model 2636A e f needed cables to connect the Series 2600A SourceMeter Instrument to the protection module s f needed cables to connect the protection module to the test fixture e f a Model 2611A or Model 2612A is being used one Model 2600 TRIAX adapter If you are not using a Model 8010 High Power Device Test Fixture you need to use a Model 2657 A PM 200 Protection Module to ensure that the lower voltage Series 2600A SMU is protected if the device fails One GPIB or Ethernet cable to connect the Model 2657A to a computer One gated thyristor for example SCR or triac enclosed in a safe test fixture Appropriate cabling to connect the SMUs to the test fixture such as the Keithley Instruments Model 8010 Test Equipment Depot 80
93. t 0 smua source output 0 cae MIkereClasing Cpiemeime emos V im print Raw data follows printData end Example usage The function in this script allows updates to the test parameters without rewriting or re running the script To run the test call the 1atchingCurr function passing in the appropriate values for test parameters latchingCurr parameters gateBiasCurr amps Gate current to apply with the Series 2600A SourceMeter instrument gateVoltLimit volts Voltage limit compliance for the Series 2600A connected to the gate terminal of the thyristor Amount of ime to apply the gate signal anodeStartCurr Initial anode current provided by the Model 2657A Should be much less than the specified latching current anodeMaxCurr amps Maximum anode current to apply with the Model 2657A anodeStepCurr amps Step size of the current sweep occurring at the anode of the thyristor anodeVoltLimit volts Voltage limit compliance of the Model 2657A numNPLC not applicable Integration time specified as the number of power line cycles Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com An example of how to call this function is shown here Lara Cuco 050 10 e 05020 0 120 0 005 090 0 01 This call uses the Series 2600A SourceMeter instrument to apply 60 mA for 1 ms to trigger the thyristor to turn on Meanwhile the Model 2657A applies 20 mA to the an
94. t and insulation resistance of capacitors 7 1 measure thyristor DC characteristics 9 1 MOSFET characterization 8 1 exercises create and run script with TSB Embedded 4 4 retrieve readings from buffer 4 7 export script 4 7 Index F FAQs 10 1 front panel 3 2 compliance limit 5 4 indicators 3 2 interface 3 1 measurements 5 1 5 4 output on off 5 4 readings 5 5 source measure procedure 5 4 using 3 1 functions selecting 5 4 H HV triaxial connections 2 7 l import script 4 7 indicators 3 2 interlock 2 3 error 10 3 IP address 4 3 J Java plug in 4 1 K keypad 3 4 keys 3 2 3 3 L LXI Discovery Tool 4 1 download 4 1 M measurement front panel 5 1 5 4 function selecting 5 4 ranges 5 4 thyristor DC characteristics 9 1 N navigation wheel 3 2 3 4 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com number keys 3 3 IP address configuration 4 3 reading buffers 4 7 O TSB Embedded 4 4 operation keys 3 3 TSP Express 4 9 output enable 5 4 using 4 1 OUTPUT ON OFF control 3 2 5 4 5 5 R range selecting autorange 5 4 reading buffer 4 7 displaying readings 4 7 downloading 4 7 readings display 5 5 observing 4 7 5 5 S scripts abort 4 7 clearing 4 7 create in TSB Embedded 4 4 deleting 4 7 exporting 4 7 importing 4 7 manageme
95. t power line frequency or voltage What do I need to do The Model 2657A requires a line voltage of 100 V AC to 240 V AC 10 and a line frequency of 50 Hz or 60 Hz Keithley Instruments sets the line frequency of the Model 2657A for the final shipping destination of the instrument You can manually configure the instrument to match the actual line frequency To configure the line frequency from the front panel Press the MENU key Turn the navigation wheel to select LINE FREQ Press the ENTER key Turn the navigation wheel to select the appropriate frequency Press the ENTER key Press the EXIT LOCAL key to return to the default display screen D W EM MA Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Where can find updated drivers For the latest drivers and additional support information see the Keithley Instruments support website To see what drivers are available for your instrument 1 Goto the Keithley Instruments support website http www keithley com support 2 Enter the model number of your instrument 3 Select Software Driver from the list For LabVIEW you can also go to National Instrument s website and search their instrument driver database Can convert to coaxial cables Use the optional cable assembly Keithley Instruments part number SHV CA 553 which converts a high voltage triaxial connector to a safe high voltage SHV connector
96. tective earth safety Redundant grounds may be required for specific ground test setups M Model HV CA 57 1 3 High Voltage 4 See Using high voltage triaxial connectors on A safety enclosure with an interlock that has a normally open NO switch Triaxial Panel Mount Connector to page 2 7 Unterminated Cable Assembly 2 Model 2657A interlock connection 1 Model 26574 digital I O pin 24 INT and pin 22 5 VDC connected to the test fixture lid switch Pin 24 and pin 19 are connected to the interlock and digital ground on the Model 263xA Keithley Instrument s Model 7709 308 is a 25 pin interlock male connector that can be used for custom connections Interlock switch is shown in the disengaged lid open position 7 Model HV CA 554 HV Triaxial Cable Protective earth safety ground for the Model 2657A PM 200 Protection Module ground cables Model CA 568 Model 2657A PM 200 Protection 1 Module Model 2611A 2612A 2635A or Pin 24 INT and pin 19 5 V DC are connected to The Model 2657A PM 200 must be connected to protective earth using the supplied green yellow 2636A interlock connection the test fixture lid switch 11 Model 7078 TRX triaxial cables oe ON 12 Series 2600A System SourceMeter 1 If a Model 2611A or 2612A is used a Instrument Model 2611A Model 2612A Model 2635A or Model 2636A 15 moer A 4 2 2 Model 2600 TRIAX adapter is also required If you are using a Model 8010 High Power Test F
97. th to the common side of the circuit under test or power line earth ground Always make measurements with dry hands while standing on a dry insulated surface capable of withstanding the voltage being measured Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the equipment may be impaired Do not exceed the maximum signal levels of the instruments and accessories as defined in the specifications and operating information and as shown on the instrument or test fixture panels or switching card When fuses are used in a product replace with the same type and rating for continued protection against fire hazard Chassis connections must only be used as shield connections for measuring circuits NOT as safety earth ground connections If you are using a test fixture keep the lid closed while power is applied to the device under test Safe operation requires the use of a lid interlock Ifa screw is present connect it to safety earth ground using the wire recommended in the user documentation The A symbol on an instrument means caution risk of danger The user should refer to the operating instructions located in the user documentation in all cases where the symbol is marked on the instrument The A symbol on an instrument means caution risk of electric shock Use
98. the appropriate values for test parameters DiodeRL Swp parameters Parameter Units Description sourceDelay seconds The delay between the source complete event and the start of the measurement An example of how to call this function is shown here Discs Sus 0 1000 10 1008 50 0 01 0 05 This call results in a 101 point linear voltage sweep starting at O V and proceeding to 1000 V in 10 V increments The current measurement range is set to 100 nA and the current limit is set to 10 mA A 50 ms delay occurs after each source step is programmed The source complete event of the trigger model is held off until that delay is complete Once the delay and therefore the source event is complete the measure action can take place For more information on the trigger model please see the Model 2657A Reference Guide You can use the printData function to return the stored voltage and current measurements and the timestamps The data is formatted into three columns An example of how to call the printData function is printData The results of this test are the same as those produced by the simple reverse voltage sweep See Simple reverse voltage sweep on page 6 5 for a graph of the results Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 7 Measuring capacitor leakage In this section Iag ads 7 1 P cte etin p et DL ENEE 7 1 Setup communication
99. tion notes e Updated drivers e Information on related products including e The Model 4200 SCS Semiconductor Characterization System e The Series 2600A System SourceMeter instruments e The Model 2651A High Power System SourceMeter instrument e The Model 8010 High Power Device Test Fixture e Your local Field Applications Engineer can help you with product selection configuration and usage Check the website for contact information Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com A abort script 4 7 applications basic front panel measurements 5 1 measure diode characteristics 6 1 measure leakage current and insulation resistance of capacitors 7 1 measure thyristor DC characteristics 9 1 MOSFET characterization 8 1 thyristor DC characteristics 9 1 C coaxial connections 2 4 compliance limits set through front panel 5 4 connection device 5 2 diode application 6 3 front panel measurement 5 2 MOSFET application 8 3 thyristor appplication 9 3 web interface 4 1 D delete script 4 7 Discovery Tool LXI 4 1 display observing readings 4 7 5 5 download reading buffer 4 7 E error messages interlock 10 3 example applications basic front panel measurements 5 1 measure diode characteristics 6 1 measure leakage curren
100. trical shock that could cause injury or death never make or break connections to the Model 2657A while the instrument is powered on Turn off the equipment from the front panel or disconnect the main power cord from the rear of the Model 2657A before handling cables Putting the equipment into standby does not guarantee that the outputs are powered off ifa hardware or software fault occurs Figure 12 Model 2657A four wire connections remote sensing Model 2657A Lo SENSE 3030 VDC GUARD SENSE 2v Lo LO MAX HI HI MAX e TFT Sense LO DUT HI Sense HI Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Mem peston 1 Model 2657A protective earth safety ground Additional connections for redundant protective earth may be required Keithley Instrument s Model CA 568 is a protective earth safety ground cable assembly 2 Interlock connection 1 Model 26574 digital I O pin 24 INT and pin 22 5 VDC connected to the test fixture lid switch Keithley Instrument s Model 7709 308 is a 25 pin interlock male connector that can be used for custom connections Interlock switch is shown in the disengaged lid open position 3 Test fixture interlock switch connection 4 Interlocked metal safety enclosure normally open NO switch 5 Test fixture protective earth safety Redundant grounds may be required for
101. try when the keys instrument is in the EDIT mode Press the navigation wheel to enter EDIT mode see To change a value using the numeric keypad on page 3 4 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Placing a Model 2657A in standby A WARNING Hazardous voltages may be present on all output and guard terminals To prevent electrical shock that could cause injury or death never make or break connections to the Model 2657A while the instrument is powered on Turn off the equipment from the front panel or disconnect the main power cord from the rear of the Model 2657A before handling cables Putting the equipment into standby does not guarantee that the outputs are powered off if a hardware or software fault occurs When the instrument is on you can place the output in an active output state output on or a standby mode output off From the front panel press the OUTPUT ON OFF control to toggle the output using the present instrument configuration You can also place the output in standby over the remote interface by sending the following command smua source output 0 Even though the instrument is placed in standby the output may not be actually off Changing values from the front panel You can use the navigation wheel or the number pad to change values on the display as described in the following sections To change a value using the navigation wheel
102. turns off This final current is the holding current Example code eset Il holdingCurr gateBiasCurr gateVoltLimit gateOnTime anodeBiasVolt anodeLatchingCurr anodeCurrStep numNPLC Description This function can be used to determine Ih of a thyristor T wo SMUs are required for this function One SMU node 2 smua is connected to the gate terminal and is used to trigger the device The Model 2657A smua is connected to the anode and is applying a voltage bias After the device is turned on the gate signal is removed and the current limit of the Model 2657A is varied until the device turns off The current at which the device turns off is the holding current Parame Sist gateBiasCurr Current to apply to the gate to trigger the device on Should be greater than or equal to the gate trigger current gateVoltLimit Voltage limit for the gate SMU Should be greater than or equal to the gate trigger voltage gateOnTime Number of seconds to apply the gate trigger single pulse event anodeBiasVolt Model 2657A applies this voltage to the anode terminal anodeLatchingCurr Specified latching current of the device This will be the initial current limit of the Model 2657A anodeCurrStep How much to vary the anode current in order to arrive at the holding current numNPLC Integration time in number of power line cycles Example usage moliclingcmer 0 05 1056 3 2 12 0 06 0 009 1
103. umPoints smua trigger source action smua ENABLE smua trigger source stimulus 0 O Configure measurements during the sweep smua trigger measure action smua ENABLE smua trigger measure stimulus 0 smua trigger measure iv smua nvbufferl smua nvbuffer2 Configure trigger model parameters Sel Trigger Coume T smua trigger arm count 1 Turn on the output smua source output 1 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com cul Initiate the sweep and wait until sweep is complete before proceeding to next command ect smua trigger initiate waitcomplete Ulblici OE edge OCENE smua source output 0 end elt This function prints the data from the smua nvbufferl and smua nvbuffer2 reading buffers into three separate columns cerit function printData if smua nvbufferl n 0 then print No readings in buffer else print Timestamps tCurrent tVoltage for i 1 smua nvbufferl n do print string format gNt gNt g smua nvbufferl timestamps i smua nvbufferl readings i smua nvbuffer2 readings i end end end Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Example usage The functions in this script allow updates to the test parameters without rewriting or re running the script To run the test call the DiodeRL Swp function passing in
104. uring the System SourceMeter Instruments and returning current and voltage readings from the reading buffer Example code Title FET Drain to Source Leakage Current Measurement Sweep Description This script measures the drain current while the drain voltage is sweeping linearly and under a 0 V gate bias a z sit Idss gateV startV stopV numSteps measDelay measRange iLimit numNPLC Description This function uses the Model 2657A to sweep the voltage across the drain up to the drain source breakdown voltage and measure the drain current A second SourceMeter instrument is used to bias the gate For enhancement mode power MOSFETs a typical gate bias is 0 V Barametenss gateV Applied gate voltage bias Vgs startV Starting drain voltage Vds stopV Final drain voltage Vds numSteps Number of points in the drain voltage sweep measDelay Measurement delay measRange Current measurement range for the drain current measurements iLimit Current limit compliance for the drain current numNPLC Integration time in the number of power line cycles Example Usage less 0 10 17607 500 0 05 1008 9 5005 6 1 eed Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com function Idss gateV startV SI os MUS reset rrorqueue clear status reset stopv numSteps measDelay measRange Configure reading buffers
105. utput smua OUTPUT ON Print and place current reading in buffer print smua measure i smua nvbufferl Mica Quest OUlicjawie smua source output smua OUTPUT OFF Beep beeper enable beeper ON beeper beep 1 1200 beeper enable beeper OFF NOTE Commands and parameters for the Model 2657A are case sensitive It is important to type in the commands exactly as shown to avoid syntax and execution errors 4 Click Save Script The script is added to the User Scripts list on the left You can use standard edit functions such as copy cut and paste in TSB Embedded The standard functions are available as both keyboard shortcuts and right click menus 5 Clear the buffer s Inthe console type the following and then click Enter smua nvbufferl clear s If successful the command will appear in the Instrument Output box 6 Setthe buffer to append readings s In the console type the following and then click Enter smua nvbufferl appendmode 1 s If successful the command will appear in the Instrument Output box 7 Setthe buffer to collect timestamps s In the console type the following and then click Enter smua nvbufferl collecttimestamps 1 e f successful the command will appear in the Instrument Output box 8 Runthe script e Select the script in the User Scripts list e Click Run Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com 9
106. y current measurements or voltage source oscillation occurs try inserting a resistor or low leakage diode in series with the capacitor See the application note Capacitor Leakage Measurements with a Model 6517A Electrometer on the Keithley Instruments website http www keithley com for more detail Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com Section 8 Measuring MOSFET characteristics In this section ltr od Ue aaa 8 1 EqQuIpMONERGQ WINGO RS 8 1 Setup communication sites 8 2 Device conectlofis iioii aciei i ssi todo sedeo nb as Lar Habes Ebo isidori 8 3 BVdss measutretmerib An 8 6 Idss measurements as 8 9 Introduction These examples demonstrate how to use the Model 2657A High Power System SourceMeter Instrument to measure drain to source breakdown and leakage current of a MOSFET There are two examples in this section The first example performs the BV uss measurement in which a specific current is forced from the drain to the source terminals l4 and a voltage measurement is performed V The second example performs the lass measurement in which the Model 2657A sweeps the drain voltage Vas and makes drain current measurements with the FET in the off state In both examples a second System SourceMeter Instrument is used to apply a voltage from gate to source Vgs For n channel enhancement mode devices V is usually 0 V Equipment required Equipm

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