Keithley 2657A User Manual
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Keithley 2657A User Manual

Keithley 2657A User Manual

High power system sourcemeter instrument
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Model 2657A High Power
System SourceMeter
®
Instrument
User's Manual
2657A-900-01 Rev. A / April 2012
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  • Page 1 Model 2657A High Power System SourceMeter ® Instrument User’s Manual 2657A-900-01 Rev. A / April 2012...
  • Page 2 © 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. ® ® ®...

  • Page 3: Safety Precautions

    Keithley Instruments products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high transient overvoltages.
  • Page 4 (note that selected parts should be purchased only through Keithley Instruments 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.

  • Page 5: Table Of Contents

    Introduction .......................... 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 interlock of the Model 2657A ................2-3 Connecting the Model 2657A output to a custom test fixture ............ 2-4 Four-wire connections to a test fixture with HV triaxial connectors ...........
  • Page 6 Table of Contents Model 2657A High Power System Sourcemeter® Instrument User's Manual Making front-panel measurements ..................5-4 Procedure for making front-panel measurements ..............5-4 Measuring diode off-state breakdown ..............6-1 Introduction .......................... 6-1 Equipment required ......................6-1 Set up communication......................6-2 Device connections ......................
  • Page 7 Model 2657A High Power System Sourcemeter® Instrument User's Manual Table of Contents Vdrm and Idrm thyristor measurements ................9-6 Example code ........................... 9-6 Example usage ......................... 9-8 Determine the holding current of a thyristor ............... 9-10 Example code ......................... 9-10 Example usage ........................

  • Page 9: Introduction

    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.

  • Page 10: Cd-Rom Contents

    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.

  • Page 11: Organization Of Manual Sections

    (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.

  • Page 13: Safe Configuration And Test Setup

    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.
  • Page 14 Section 2: Safe configuration and test setup Model 2657A High Power System Sourcemeter® Instrument User's Manual To connect the Model 2657A output to the Model 8010, use only Model HV-CA-554 high-voltage triaxial cable assemblies. See the following figure for connections.

  • Page 15: Using The Model 2657A In A Custom Test Fixture Or System

    Section 2: Safe configuration and test setup Using the Model 2657A in a custom test fixture or system You can use the Model 2657A safely with a properly designed custom test fixture or with a semiconductor device prober or handler.

  • Page 16: Connecting The Model 2657A Output To A Custom Test Fixture

    Model 2657A High Power System Sourcemeter® Instrument User's Manual 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."...
  • Page 17 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.
  • Page 18 Keithley Instrument's Model CA-568 is a protective earth (safety ground) cable assembly. Interlock connection Model 2657A 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.
  • Page 19 Section 2: Safe configuration and test setup 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 Model 2657A to these custom test fixtures.
  • Page 20 Section 2: Safe configuration and test setup Model 2657A High Power System Sourcemeter® Instrument User's Manual Please note how the above spacing requirements relate to the output terminals of the Model 2657A: Figure 9: Model 2657A HI and SHI terminals...

  • Page 21: Four-Wire Connections To A Test Fixture With Hv Triaxial Connectors

    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.
  • Page 22 Keithley Instrument's Model CA-568 is a protective earth (safety ground) cable assembly. Interlock connection Model 2657A 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.

  • Page 23: Using The Front-Panel Interface

    Front panel ................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.

  • Page 24: Front Panel

    ENTER key. (4) 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.
  • Page 25 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 3: Using the front-panel interface (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.

  • Page 26: Placing A Model 2657A In Standby

    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.

  • Page 27: Using The Web Interface

    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.

  • Page 28: Web Interface Home Page

    To manually set up the IP address to connect the instrument to the web interface: 1. Connect the Model 2657A to the LAN and confirm 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.

  • Page 29: Ip Configuration Tab

    Section 4: Using the web interface 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. You must reload the page if you change the LAN settings from the Modify IP configuration page. If the...

  • Page 30: Tsb Embedded

    Section 4: Using the web interface Model 2657A High Power System Sourcemeter® Instrument User's Manual 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.
  • Page 31 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 4: Using the web interface 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 Item...
  • Page 32 1200) beeper.enable = beeper.OFF 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.

  • Page 33: Reading Buffers

    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 the buffer by the Exercise: Create and run a script with TSB Embedded (on page 4-4).
  • Page 34 Section 4: Using the web interface Model 2657A High Power System Sourcemeter® Instrument User's Manual 2. From the left box (1 in the following graphic), select smua.nvbuffer1. 3. In the Recall Attributes area (near the bottom of the page, shown as 2 in the following graphic), select Values and Time Stamp.

  • Page 35: Tsp Express

    Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 4: Using the web interface 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.
  • Page 36 Section 4: Using the web interface Model 2657A High Power System Sourcemeter® Instrument User's Manual Figure 22: TSP Express 4-10 2657A-900-01 Rev. A / April 2012...

  • Page 37: Making Basic Front-Panel Measurements

    Making front-panel measurements ........... 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 MΩ resistor. Similar measurements can be made on any two-terminal device under test (DUT) if appropriate source values are used.

  • Page 38: Device Connections

    Section 5: Making basic front-panel measurements Model 2657A High Power System Sourcemeter® Instrument User's Manual Device connections Connections from the Model 2657A to the DUT are shown in the illustrations on the following pages. Proper care should be taken to ensure good contact through all connections.
  • Page 39 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 5: Making basic front-panel measurements Item Description Notes 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.

  • Page 40: Making Front-Panel Measurements

    Section 5: Making basic front-panel measurements Model 2657A High Power System Sourcemeter® Instrument User's Manual Making front-panel measurements Use the following procedure to configure the instrument and make measurements from the front panel. 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.

  • Page 41: Step 6: Turn Output Off

    Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 5: Making basic front-panel measurements 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.

  • Page 43: Introduction

    If you require very precise timing either for source or measurement. • If 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: •...

  • Page 44: Set Up Communication

    Section 6: Measuring diode off-state breakdown Model 2657A High Power System Sourcemeter® Instrument User's Manual 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.

  • Page 45: Device Connections

    Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 6: Measuring diode off-state breakdown Device connections Refer to the following figure to connect the diode in a safe test fixture. Safe configuration and test setup (on page 2-1) for information on safely connecting the Model 2657A to a device under test (DUT).
  • Page 46 Triaxial to SHV Cable 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" for connections and the Model 8010 User's Manual drawing "Model 2657A connections."...

  • Page 47: Simple Reverse Voltage Sweep

    Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 6: Measuring diode off-state breakdown Simple reverse voltage sweep The example code is designed to be run from Test Script Builder or TSB Embedded. It can also be ® ®...
  • Page 48 Section 6: Measuring diode off-state breakdown Model 2657A High Power System Sourcemeter® Instrument User's Manual 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.
  • Page 49 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 6: Measuring diode off-state breakdown --Configure the reading buffers. smua.nvbuffer1.clear() smua.nvbuffer1.appendmode = 1 smua.nvbuffer1.collecttimestamps = 1 smua.nvbuffer1.collectsourcevalues = 0 smua.nvbuffer1.fillmode = smua.FILL_ONCE smua.nvbuffer2.clear() smua.nvbuffer2.appendmode = 1 smua.nvbuffer2.collecttimestamps = 1 smua.nvbuffer2.collectsourcevalues = 0 smua.nvbuffer2.fillmode = smua.FILL_ONCE...

  • Page 50: Example Usage

    Section 6: Measuring diode off-state breakdown Model 2657A High Power System Sourcemeter® Instrument User's Manual 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.

  • Page 51: Advanced Reverse Voltage Sweep

    Section 6: Measuring diode off-state breakdown Advanced reverse voltage sweep This example demonstrates how to use the trigger model of the Model 2657A to perform a reverse linear voltage 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.
  • Page 52 Section 6: Measuring diode off-state breakdown Model 2657A High Power System Sourcemeter® Instrument User's Manual --[[ Calculate the number of points in the sweep based on the start and stop values. --]] if math.abs(vstart) > math.abs(vstop) then smua.source.rangev = vstart else smua.source.rangev = vstop...
  • Page 53 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 6: Measuring diode off-state breakdown --[[ Initiate the sweep and wait until sweep is complete before proceeding to next command. --]] smua.trigger.initiate() waitcomplete() --Turn off the output. smua.source.output = 0 --[[ This function prints the data from the smua.nvbuffer1 and...

  • Page 54: Example Usage

    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.

  • Page 55: Measuring Capacitor Leakage

    • 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 2657A to the test fixture...

  • Page 56: Set Up Communication

    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."...
  • Page 57 Keithley Instrument's Model CA-568 is a protective earth (safety ground) cable assembly. Interlock connection Model 2657A 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.

  • Page 58: Measuring Leakage Current And Insulation Resistance

    Section 7: Measuring capacitor leakage Model 2657A High Power System Sourcemeter® Instrument User's Manual Figure 31: Two-wire capacitor physical connections Measuring leakage current and insulation resistance The example code is designed to be run from Test Script Builder or TSB Embedded. It can also be ®...
  • Page 59 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 7: Measuring capacitor leakage --Configure reading buffers. smua.nvbuffer1.clear() smua.nvbuffer1.appendmode = 0 smua.nvbuffer1.collecttimestamps = 1 smua.nvbuffer1.collectsourcevalues = 0 smua.nvbuffer2.clear() smua.nvbuffer2.appendmode = 0 smua.nvbuffer2.collecttimestamps = 1 smua.nvbuffer2.collectsourcevalues = 0 --Configure source function.

  • Page 60: Example Usage

    Section 7: Measuring capacitor leakage Model 2657A High Power System Sourcemeter® Instrument User's Manual --[[ This function prints the raw voltage and current measurements that are stored in reading buffers smua.nvbuffer1 and smua.nvbuffer2 --]] function printData() --Retrieve average values of measured current and voltage.
  • Page 61 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 7: Measuring capacitor leakage An example of how to call this function is as follows: runCapLeak(2000, 1e-3, 10e-9, 10, 30, 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.
  • Page 62 Figure 33: Sample data for capacitor leakage test The Model 2657A voltage source is stable into capacitance values of up to 10 µF typical on the 1500 V and 3000 V ranges. See the latest Model 2657A specifications on the Keithley Instruments website for detail.

  • Page 63: Measuring Mosfet Characteristics

    • One GPIB or Ethernet cable to connect the Model 2657A to a computer • One high voltage MOSFET device enclosed in a safe test fixture, such as the Keithley Instruments Model 8010 • Appropriate cabling to connect the Model 2657A the test fixture...

  • Page 64: Set Up Communication

    Section 8: Measuring MOSFET characteristics Model 2657A High Power System Sourcemeter® Instrument User's Manual 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.

  • Page 65: Device Connections

    Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 8: Measuring MOSFET characteristics 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.
  • Page 66 Section 8: Measuring MOSFET characteristics Model 2657A High Power System Sourcemeter® Instrument User's Manual Figure 35: Schematic for measuring MOSFET characteristics application example 2657A-900-01 Rev. A / April 2012...
  • Page 67 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 information on how to connect the instrument to the fixture.

  • Page 68: Bvdss Measurement

    . However, you may need to make changes to the example code to use other programming environments. This example performs the BV measurement. The Model 2657A forces a current from the drain to source terminals and measures the resulting V . This example uses a TSP script to perform the measurement.

  • Page 69: Example Code

    --[[ 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.

  • Page 70: Example Usage

    Section 8: Measuring MOSFET characteristics Model 2657A High Power System Sourcemeter® Instrument User's Manual --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 = drainI smua.source.limitv = vdLimit --Configure measurement parameters.

  • Page 71: Idss Measurement

    BVdss(0, 0.001, 0.01, 0.01, 2000, 1) This call applies 0 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.
  • Page 72 Section 8: Measuring MOSFET characteristics Model 2657A High Power System Sourcemeter® Instrument User's Manual function Idss(gateV, startV, stopV, numSteps, measDelay, measRange, iLimit, numNPLC) --Initialize SMU. reset() errorqueue.clear() status.reset() --Configure reading buffers. smua.nvbuffer1.clear() smua.nvbuffer1.appendmode = 1 smua.nvbuffer1.collecttimestamps = 1 smua.nvbuffer2.clear() smua.nvbuffer2.appendmode = 1 smua.nvbuffer2.collecttimestamps = 1...

  • Page 73: Example Usage

    Idss(0, 10, 1760, 500, 0.05, 100e-9, 500e-6, 1) 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.
  • Page 74 Section 8: Measuring MOSFET characteristics Model 2657A High Power System Sourcemeter® Instrument User's Manual Example output data is shown in the following graphic. Figure 37: Example output data 8-12 2657A-900-01 Rev. A / April 2012...

  • Page 75: Measuring Thyristor Dc Characteristics

    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...

  • Page 76: Set Up Communication

    Section 9: Measuring thyristor DC characteristics Model 2657A High Power System Sourcemeter® Instrument User's Manual 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.

  • Page 77: Device Connections

    Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 9: Measuring thyristor DC characteristics Device connections Refer to the following figures to connect the thyristor in a safe test fixture. Safe configuration and test setup (on page 2-1) for information on safely connecting the Model 2657A to a device under test (DUT).
  • Page 78 Section 9: Measuring thyristor DC characteristics Model 2657A High Power System Sourcemeter® Instrument User's Manual Item Description Notes 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.
  • Page 79 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 9: Measuring thyristor DC characteristics Figure 40: Connections for gated thyristor application example 2657A-900-01 Rev. A / April 2012...

  • Page 80: Vdrm And Idrm Thyristor Measurements

    I measurements, and may also be used to determine V . The 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.
  • Page 81 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 9: Measuring thyristor DC characteristics Parameters: 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.

  • Page 82: Run The Test

    800, 501, 0.01, 100e-6, 1e-3, 1) 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 µA range.
  • Page 83 -800, 501, 0.010, 100e-6, 1e-3, 1) 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 µA range.

  • Page 84: Determine The Holding Current Of A Thyristor

    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.
  • Page 85 Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 9: Measuring thyristor DC characteristics --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...

  • Page 86: Example Usage

    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.

  • Page 87: Example Code

    Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 9: Measuring thyristor DC characteristics Example code --[[ 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...
  • Page 88 Section 9: Measuring thyristor DC characteristics Model 2657A High Power System Sourcemeter® Instrument User's Manual --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 = gateOnTime --Configure anode SMU source parameters. smua.source.func = smua.OUTPUT_DCAMPS smua.sense = smua.SENSE_LOCAL...

  • Page 89: Example Usage

    Model 2657A High Power System Sourcemeter® Instrument User's Manual Section 9: Measuring thyristor DC characteristics 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.nvbuffer1,smua.nvbuffer2) checkCmpl = smua.source.compliance --[[ If in compliance, then device is off.
  • Page 90 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 anode terminal. The gate signal is removed by programming the Model 2600A to force zero amps.

  • Page 91: Troubleshooting Faqs

    I need to use a Model 2657A at a different power line frequency or voltage. What do I need to 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.

  • Page 92: Where Can I Find Updated Drivers

    How do I 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).

  • Page 93: What Should I Do If I Get An 802 Interlock Error

    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 2657A front panel or through a remote interface. To set the OVP limit from the instrument front panel: 1.

  • Page 95: Next Steps

    Next steps In this section: Additional Model 2657A information ........11-1 Additional Model 2657A information For additional information about the Model 2657A, refer to: • The Product Information CD-ROM (which ships with the product). Contains software tools, drivers, and product documentation •...

  • Page 97: Index

    Index abort script • 4-7 FAQs • 10-1 applications front panel • 3-2 basic front panel measurements • 5-1 compliance limit • 5-4 measure diode characteristics • 6-1 indicators • 3-2 measure leakage current and insulation interface • 3-1 resistance of capacitors • 7-1 measurements •...
  • Page 98 Index Model 2657A High Power System Sourcemeter® Instrument User's Manual number keys • 3-3 IP address configuration • 4-3 reading buffers • 4-7 TSB Embedded • 4-4 TSP Express • 4-9 operation keys • 3-3 using • 4-1 output enable • 5-4 OUTPUT ON/OFF control •...

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