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Tektronix KEITHLEY 8020 User Manual
Tektronix KEITHLEY 8020 User Manual

Tektronix KEITHLEY 8020 User Manual

High power interface panel

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Summary of Contents for Tektronix KEITHLEY 8020

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 www.tek.com\keithley Model 8020 High Power Interface Panel User’s Manual 8020-900-01 Rev. C / March 2017 *P8020-900-01C* 8020-900-01C A Great er Me a s ure of C on f i de nc e...
  • Page 3 Model 8020 High Power Interface Panel User's Manual © 2017, Keithley Instruments Cleveland, Ohio, U.S.A. All rights reserved. Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part, without the prior written approval of Keithley Instruments is strictly prohibited. All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments.
  • Page 4: Safety Precautions

    Safety precautions The following safety precautions should be observed before using this product and any associated instrumentation. Although some instruments and accessories 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.
  • Page 5 For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be impaired. Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.
  • Page 6: Table Of Contents

    Table of Contents Model 8020 overview ....................1-1 Welcome ..........................1-1 Organization of manual sections ..................1-2 Contact information ......................1-2 Unpacking and inspection ....................1-3 Configuring and installing the Model 8020 ............. 2-1 Locating and mounting the Model 8020 ................2-2 Connecting to protective earth .....................
  • Page 7 Table of Contents Model 8020 High Power Interface Panel Applications Manual Using the Model 8020 for DC and HV C-V tests ............5-1 Model 8020-CVU bias tee overview ..................5-2 Bias tee theory overview ......................5-3 Bias tee modes ......................... 5-4 I-V mode............................
  • Page 8 Model 8020 High Power Interface Panel Applications Manual Table of Contents Frequently asked questions ..................8-1 Why does my instrument generate an interlock error / warning? ........8-1 Why are my DC current measurements unstable? .............. 8-2 Can I break the parallel connection of the high-current SMUs? .......... 8-2 Can I operate the 8020 with the top cover off? ..............
  • Page 9: Welcome

    Section 1 Model 8020 overview In this section: Welcome .................. 1-1 Organization of manual sections ..........1-2 Contact information ..............1-2 Unpacking and inspection ............1-3 Welcome Thank you for choosing a Keithley Instruments product. The Model 8020 High Power Interface Panel provides a highly accurate, flexible, and easy to use interface between the Keithley Instruments ®...
  • Page 10: Organization Of Manual Sections

    Section 1: Model 8020 overview Model 8020 High Power Interface Panel Applications Manual Organization of manual sections The first part of this user manual provides general information that helps you set up, install, and make connections to the high power interface panel. The sections after the general sections provide information that helps you use the Model 8020 with specific SourceMeter Instruments.
  • Page 11: Unpacking And Inspection

    Model 8020 High Power Interface Panel Applications Manual Section 1: Model 8020 overview Unpacking and inspection Each Model 8020 was carefully inspected electrically and mechanically before shipment. After you unpack all items from the shipping carton, check for any obvious signs of physical damage that may have occurred during transit.
  • Page 12 Section 1: Model 8020 overview Model 8020 High Power Interface Panel Applications Manual Model number Part number Quantity shipped Description 8020-SNS-2 174650070x 8 Pin to 2 Pin Phoenix Cables, 2m CS-1195-2 CS-1195-2 2-Pin Phoenix Connector for 2651A Sense 8020-RES-KIT 8020-RES-KIT HV-Rated Resistors CA-568-120 CA-568-120...
  • Page 13 Model 8020 High Power Interface Panel Applications Manual Section 1: Model 8020 overview Model number Part number Quantity shipped Description 8020-DP 090008800 Model 8020-DP High Voltage Discharge Probe 131936100 131936100 SMA (M) to SMB (M) Adapter 131936200 131936200 SMA (F) to SMB (F) Adapter 335343600 335343600 High Capacitance Warning Label...
  • Page 14: Configuring And Installing The Model 8020

    Section 2 Configuring and installing the Model 8020 In this section: Locating and mounting the Model 8020........2-2 Connecting to protective earth ..........2-3 Connecting the instrument and output interlocks ...... 2-5 Connecting a single 8020 unit ..........2-6 Connecting 2 Model 8020 units ..........2-7 Connecting multiple 8020 units ..........
  • Page 15: Locating And Mounting The Model 8020

    Section 2: Configuring and installing the Model 8020 Model 8020 High Power Interface Panel Applications Manual Locating and mounting the Model 8020 The Model 8020 is designed to be installed on a probe station or as close as possible to a probe station to ensure optimal C-V and DC measurements.
  • Page 16: Connecting To Protective Earth

    Model 8020 High Power Interface Panel Applications Manual Section 2: Configuring and installing the Model 8020 Figure 4: Model 8020 mounting specifications, unit sides Connecting to protective earth The Model 8020 must be connected to protective earth (safety ground) using both of the supplied green-yellow ground cable (Model CA-568-120).
  • Page 17 Section 2: Configuring and installing the Model 8020 Model 8020 High Power Interface Panel Applications Manual 1. Connect one lugged end of both of the supplied Model CA-568-120 ground cables to any combination of the 4 screw terminals on either panel side of the Model 8020. See the below 2 figures.
  • Page 18: Connecting The Instrument And Output Interlocks

    Model 8020 High Power Interface Panel Applications Manual Section 2: Configuring and installing the Model 8020 Connecting the instrument and output interlocks The 8020 has an interlock system to control the interlock of 26xx and 4200 instruments. On the instrument connections side of the Model 8020, there are 6 26xx interlock 3-pin connectors and one circular 3-pin connector for the 4200 interlock.
  • Page 19: Connecting A Single 8020 Unit

    Section 2: Configuring and installing the Model 8020 Model 8020 High Power Interface Panel Applications Manual On the device connections side of the 8020 there are 2 circular 4-pin connectors, The OUT connector is used for the system interlock, and the EXPANSION connector is used for extending interlock functionality in a test configuration with 2 or more Model 8020s.
  • Page 20: Connecting 2 Model 8020 Units

    Model 8020 High Power Interface Panel Applications Manual Section 2: Configuring and installing the Model 8020 Instrument-side and device-side connections for a single Model 8020 are shown in the below figure. Figure 10: 8020 interlock connections (single unit) Connecting 2 Model 8020 units The 8020 High Power Interface Panel can be connected with another 8020 unit when you have a need for more than 1 Model 2657 in the test configuration or more than 3 Series 2600 or 4200 SMUs.
  • Page 21 Section 2: Configuring and installing the Model 8020 Model 8020 High Power Interface Panel Applications Manual Figure 11: 8020 interlock connections (2 units) 8020-900-01 Rev. C / March 2017...
  • Page 22: Connecting Multiple 8020 Units

    Model 8020 High Power Interface Panel Applications Manual Section 2: Configuring and installing the Model 8020 Connecting multiple 8020 units More than 2 8020 units may be connected so that any of the connected units' interlocks will enable or disable the interlock feature for all connected instruments. The common LO/SLO may also be maintained with this configuration, as well.
  • Page 23 Section 2: Configuring and installing the Model 8020 Model 8020 High Power Interface Panel Applications Manual Figure 12: 8020 interlock connections (multiple units) 2-10 8020-900-01 Rev. C / March 2017...
  • Page 24: Installing Output Cards

    Model 8020 High Power Interface Panel Applications Manual Section 2: Configuring and installing the Model 8020 Installing output cards The following optional connector cards are available for use with the Model 8020: • 8020-AHV: Kelvin Agilent HV Triaxial • 8020-SHV: Kelvin SHV •...
  • Page 25 Section 2: Configuring and installing the Model 8020 Model 8020 High Power Interface Panel Applications Manual 1. Remove the top cover of the Model 8020 using the four thumb screws. 2. Using a slot screwdriver, loosen the three screws on the output module guide retainer and set it aside.
  • Page 26: Connecting To The Model 8020

    Section 3 Connecting to the Model 8020 In this section: Instrument panel overview ............3-1 Model 8020-CVU option ............3-3 Device connections panel overview ......... 3-3 Connections to the instrument panel ........3-5 Instrument panel overview The input/output terminals of the Model 8020 are rated for connection to circuits rated Installation Category I only, with transients rated less than 1500 V peak above the rated input.
  • Page 27 Section 3: Connecting to the Model 8020 Model 8020 High Power Interface Panel Applications Manual The Model 2600/4200#1 connectors provide sense HI, HI, LO, and sense LO input connections for the Model 2600/4200 instruments. These connections are intended for use with 200 V-compatible 2600/4200 Series instruments.
  • Page 28: Model 8020-Cvu Option

    Model 8020 High Power Interface Panel Applications Manual Section 3: Connecting to the Model 8020 The 2651 (high current) #2 connectors provide Model 2651 input connections for source LO, source HI, LO, and HI. Connections are as follows: • SLO = Sense LO •...
  • Page 29 Section 3: Connecting to the Model 8020 Model 8020 High Power Interface Panel Applications Manual The connectors provide the combined output of the Model 2651. You can use these connections to connect the Model 8020 to 1 or 2 Model 2651 units.
  • Page 30: Connections To The Instrument Panel

    Model 8020 High Power Interface Panel Applications Manual Section 3: Connecting to the Model 8020 Connections to the instrument panel This section describes the connections you can make to the instrument connections panel of the Model 8020 High Power Interface Panel. The ground wires must be attached to a known protective earth (safety ground) before powering on instruments.
  • Page 31 Section 3: Connecting to the Model 8020 Model 8020 High Power Interface Panel Applications Manual Figure 16: Connections to the 8020 instrument panel 8020-900-01 Rev. C / March 2017...
  • Page 32: Model 2611 And Model 2612 Connection Notes

    Model 8020 High Power Interface Panel Applications Manual Section 3: Connecting to the Model 8020 Model 2611 and Model 2612 connection notes The Model 8020 includes overvoltage protection circuitry for the Model 2611 and 2612 SMUs. In a test configuration having both a 200 V SMU and a Model 2657 connected to the DUT, this circuitry protects the SMUs from high voltage from the Model 2657.
  • Page 33: Using The 8020 For Dc Tests

    Section 4 Using the 8020 for DC tests In this section: Overview .................. 4-1 Channel description ..............4-2 Ensuring continuity in the measurement channel ..... 4-3 Connecting the high current channel ........4-6 Using connector cards to interface to the device ...... 4-7 Connecting to common LO for applications >...
  • Page 34: Channel Description

    Section 4: Using the 8020 for DC tests Model 8020 High Power Interface Panel Applications Manual Channel description The following are the Model 8020 DC test channels: • High voltage channel • 200 V channels #1, #2, and #3 • Common LO channel •...
  • Page 35: Ensuring Continuity In The Measurement Channel

    Model 8020 High Power Interface Panel Applications Manual Section 4: Using the 8020 for DC tests Common LO and Sense LO are clamped to 42 V from chassis and can be tied to chassis using the binding posts and link at the device connections panel of the instrument. See the below graphic. Figure 18: LO connector connected to chassis ground lug The high current channel can accept up to two Model 2651A 50 A SMU instruments and places these instruments in parallel to allow up to 100 A pulses.
  • Page 36 Section 4: Using the 8020 for DC tests Model 8020 High Power Interface Panel Applications Manual Some high-gain devices are prone to oscillation during testing and a series resistor is useful for suppressing such oscillations. You may also use series resistors to limit the absolute current from the SMU instrument, such as for a breakdown voltage measurement.
  • Page 37: How To Insert A Series Resistor In The 8020

    Model 8020 High Power Interface Panel Applications Manual Section 4: Using the 8020 for DC tests Figure 21: Resistor installed for off-state characteristic measurements For more information on the applications/measurement conditions that benefit from a series resistor, see Section 7, Measurement considerations (on page 7-1).
  • Page 38: Connecting The High Current Channel

    Section 4: Using the 8020 for DC tests Model 8020 High Power Interface Panel Applications Manual The following instructions explain how to install a resistor in a path of the Model 8020. 1. Remove any external power that is connected to the interface through connected devices or devices under test (DUTs).
  • Page 39: Using Connector Cards To Interface To The Device

    Model 8020 High Power Interface Panel Applications Manual Section 4: Using the 8020 for DC tests Using connector cards to interface to the device The connector cards interface each instrument or measurement channel to the connector or terminal at the device under test. Each connector card is designed for Kelvin connectors and thus has separate force and sense connections.
  • Page 40: Overcurrent Protection

    Section 4: Using the 8020 for DC tests Model 8020 High Power Interface Panel Applications Manual The LO output can also be connected to ground via the link attached to the chassis ground lug. See the below graphic. Figure 24: LO connector connected to chassis ground lug Overcurrent protection Each connector card contains a 10 A fuse to allow maximum pulse current for each SMU instrument.
  • Page 41: Using The Model 8020 For Dc And Hv C-V Tests

    Section 5 Using the Model 8020 for DC and HV C-V tests In this section: Model 8020-CVU bias tee overview ......... 5-2 HV C-V measurement software ..........5-8 Configuring the 8020 for HV C-V measurements ..... 5-8 Discharge bias tee and system capacitance ......5-10 Use the Model 8020-DP to discharge system capacitance ..
  • Page 42: Model 8020-Cvu Bias Tee Overview

    Section 5: Using the Model 8020 for DC and HV C-V tests Model 8020 High Power Interface Panel Applications Manual Model 8020-CVU bias tee overview The Model 8020-CVU bias tee is a factory-installed option for the Model 8020 High Power Interface Panel.
  • Page 43: Bias Tee Theory Overview

    Model 8020 High Power Interface Panel Applications Manual Section 5: Using the Model 8020 for DC and HV C-V tests Bias tee theory overview The 8020-CVU bias tees combine C-V measurement with DC bias while isolating the C-V instrument and SMU instrument from each other. A typical bias tee uses a capacitor to isolate the C-V instrument from interfering with DC measurements and an inductor is used in series with the SMU instrument to isolate the SMU from interfering with AC measurement (see the following figure).
  • Page 44: Bias Tee Modes

    Section 5: Using the Model 8020 for DC and HV C-V tests Model 8020 High Power Interface Panel Applications Manual Bias tee modes Each Model 8020-CVU bias tee can be configured in one of four modes: IV mode (on page 5-6) C-V mode (on page 5-6) CV Hi I mode...
  • Page 45 Model 8020 High Power Interface Panel Applications Manual Section 5: Using the Model 8020 for DC and HV C-V tests Table: Four available bias tee modes Mode Application Block Control AC switch AC guard diagram state switch state switch voltage state I-V mode Use for best DC low...
  • Page 46: I-V Mode

    Section 5: Using the Model 8020 for DC and HV C-V tests Model 8020 High Power Interface Panel Applications Manual I-V mode This is the default state for the bias tees. Use this mode for performing any DC measurements through the 8020-CVU bias tees. Low current DC measurements made with the 8020-CVU bias tee installed require additional settling time over those made without a Model 8020-CVU;...
  • Page 47: C-V Hi I Mode

    Model 8020 High Power Interface Panel Applications Manual Section 5: Using the Model 8020 for DC and HV C-V tests C-V Hi I mode This mode is ideal for performing C-V measurements where DC bias current up to 1 A is required. This high current may be useful for making C-V measurements on a semiconductor device in the on- state.
  • Page 48: Hv C-V Measurement Software

    Section 5: Using the Model 8020 for DC and HV C-V tests Model 8020 High Power Interface Panel Applications Manual Figure 32: 8020 AC guard eliminates measurement errors Programming the bias tee to AC guard mode requires a +12 V signal; an SMA connector on the 8020-CVU labeled "AC Guard"...
  • Page 49 Model 8020 High Power Interface Panel Applications Manual Section 5: Using the Model 8020 for DC and HV C-V tests To enable high voltage C-V measurements with the 8020-CVU bias tee options, ensure that there is continuity in the correct path between nodes 1 and 2 on the 8020 motherboard for the high voltage and 200 V channels.
  • Page 50: Discharge Bias Tee And System Capacitance

    Section 5: Using the Model 8020 for DC and HV C-V tests Model 8020 High Power Interface Panel Applications Manual For pulsed DC measurements with the 8020-CVU installed, install a short or a resistor to ensure that there is signal continuity in the DC Input path on the 8020 motherboard (see the previous figure). This path bypasses the inductor of the bias tee, which can have an adverse effect on pulse shape.
  • Page 51: Use The Model 8020-Dp To Discharge System Capacitance

    Model 8020 High Power Interface Panel Applications Manual Section 5: Using the Model 8020 for DC and HV C-V tests Use the Model 8020-DP to discharge system capacitance Prior to connecting the Model 8020-DP High Voltage Discharge Probe, ensure that the Model 8020 is connected to protective earth.
  • Page 52 Section 5: Using the Model 8020 for DC and HV C-V tests Model 8020 High Power Interface Panel Applications Manual 2. Loosen the thumb screws on the top cover of the Model 8020. 3. Remove the top cover of the 8020 and set it aside. 4.
  • Page 53 Model 8020 High Power Interface Panel Applications Manual Section 5: Using the Model 8020 for DC and HV C-V tests Figure 40: 8020-DP node 2 5. Repeat the discharge procedure for nodes 1a, 1b, and 2 of the 200 V channels on the Model 8020 main board.
  • Page 54: In This Section

    Section 6 Applications In this section: Device connections ..............6-1 Equipment options (all examples) ..........6-2 Software ................... 6-2 2-terminal device connections for I-V measurements ....6-3 3-terminal device connections for I-V measurements ....6-6 2-terminal device connections for C-V measurements ... 6-10 3-terminal device connections for C-V measurements ...
  • Page 55: Equipment Options (All Examples)

    Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Equipment options (all examples) Depending on your testing needs, you can order any of the following configurations: Part number Description 8020 Model 8020 High Power Interface Panel 2600-PCT-3B High Voltage Parametric Curve Tracer PCT-CVU Parametric Curve Tracer - Capacitance Voltage Unit Model 8020-CVU Integrated 3 kV and 200 V Bias...
  • Page 56: 2-Terminal Device Connections For I-V Measurements

    Model 8020 High Power Interface Panel Applications Manual Section 6: Applications 2-terminal device connections for I-V measurements Using the Model 2657A This example illustrates how to make local sense connections to a 2-terminal device using the Model 2657A 3 kV SMU instrument. Figure 41: 2-terminal connections using the Model 2657A 8020-900-01 Rev.
  • Page 57: Using The Model 2600 / 4200

    Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Using the Model 2600 / 4200 This example illustrates how to make local sense connections to a 2-terminal device using a Series 2600B or Series 4200-SMU instrument. Figure 42: 2-terminal connections using the Model 2600 / 4200 8020-900-01 Rev.
  • Page 58: Using The Model 2651A

    Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Using the Model 2651A This example illustrates how to make remote sense connections to a 2-terminal device using the Model 2651A-SMU instrument. Figure 43: 2-terminal connections using the Model 2651A 8020-900-01 Rev.
  • Page 59: 3-Terminal Device Connections For I-V Measurements

    Section 6: Applications Model 8020 High Power Interface Panel Applications Manual 3-terminal device connections for I-V measurements Off-state characterization of a power MOSFET using the Model 2657A and Series 2600B / 4200-SMU instruments (up to 3 kV) This example illustrates how to make local sense connections to a MOSFET using one Model 2657A and up to two Series 2600B SMU instruments through the Model 8020 High Power Interface Panel.
  • Page 60: Off-State Characterization Of A Power Mosfet Using The Series 2600B / 4200 Smu Instruments (Up To 200 V)

    Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Off-state characterization of a power MOSFET using the Series 2600B / 4200 SMU instruments (up to 200 V) This example illustrates how to make local sense connections to a MOSFET using two Series 2600B or 42x0-SMU instruments.
  • Page 61: On-State Characterization Of A Power Mosfet Using The Model 2651A And Series 2600 / 4200 Smu Instruments (Up To 100 A Pulse)

    Section 6: Applications Model 8020 High Power Interface Panel Applications Manual On-state characterization of a power MOSFET using the Model 2651A and Series 2600 / 4200 SMU instruments (up to 100 A pulse) This example illustrates how to make remote sense connections to a MOSFET using one or two Model 2651A SMUs and one Series 2600B SMU or 42x0-SMU instrument.
  • Page 62: On-State Characterization Of A Power Mosfet Using 2 Series 2600 / 4200 Smu Instruments (Up To 10 A Pulse)

    Model 8020 High Power Interface Panel Applications Manual Section 6: Applications On-state characterization of a power MOSFET using 2 Series 2600 / 4200 SMU instruments (up to 10 A pulse) This example illustrates how to make remote sense connections to a MOSFET using two Series 2600B or 42x0-SmU instruments.
  • Page 63: 2-Terminal Device Connections For C-V Measurements

    Section 6: Applications Model 8020 High Power Interface Panel Applications Manual 2-terminal device connections for C-V measurements The factory-installed 8020-CVU option must be installed to make the connections illustrated in this sub-section. This example illustrates how to make connections to a two-terminal device for 3 kV C-V measurements using a Model 2657A SMU and a Series 2600/4200 SMU instrument.
  • Page 64 Model 8020 High Power Interface Panel Applications Manual Section 6: Applications The following diagram illustrates the connections between the device connections panel of the Model 8020 and the device under test. Figure 49: 2 terminal, device side, C-V measurement connections 8020-900-01 Rev.
  • Page 65: Open And Short Compensation

    Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Below is a simple schematic for 2-terminal C-V measurements. Figure 50: 2-terminal C-V measurement schematic Open and short compensation Perform open and short compensation to remove error due to bias tee impedance as well as the stray resistance, capacitance, and inductance in the test setup.
  • Page 66: 3-Terminal Device Connections For C-V Measurements

    Model 8020 High Power Interface Panel Applications Manual Section 6: Applications 3-terminal device connections for C-V measurements The factory-installed 8020-CVU option must be installed to make the connections illustrated in this sub-section. Overview and theory There are two different ways to look at the capacitance of three-terminal power semiconductor devices such as MOSFETs, BJTs, and IGBTs: at the component level and at the circuit level.
  • Page 67 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual The next 3 figures illustrate the relationship between the component level and circuit-level capacitances for a power MOSFET. Similar capacitance measurements can also be made for BJT and IGBT devices. Figure 52: Diagram of input capacitance for a power MOSFET Figure 53: Diagram of output capacitance for a power MOSFET Figure 54: Diagram of reverse transfer capacitance for a power MOSFET...
  • Page 68: Instrument Connections For Power Mosfet Capacitance Measurements

    Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Instrument connections for power MOSFET capacitance measurements The graphics in this section illustrate the connections between the 4210-CVU instrument card and the instrument connections panel of the Model 8020. The graphics also assume that connections to the SMU have already been made.
  • Page 69 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Figure 56: Cgs block diagram schematic 6-16 8020-900-01 Rev. C / March 2017...
  • Page 70 Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Figure 57: Cds connection diagram 8020-900-01 Rev. C / March 2017 6-17...
  • Page 71 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Figure 58: Cds block diagram schematic 6-18 8020-900-01 Rev. C / March 2017...
  • Page 72 Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Cgd / Crss Figure 59: Cgd / Crss connection diagram 8020-900-01 Rev. C / March 2017 6-19...
  • Page 73 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Figure 60: Cgd / Crss block diagram schematic 6-20 8020-900-01 Rev. C / March 2017...
  • Page 74 Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Ciss Figure 61: Ciss connection diagram 8020-900-01 Rev. C / March 2017 6-21...
  • Page 75 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Figure 62: Ciss block diagram schematic 6-22 8020-900-01 Rev. C / March 2017...
  • Page 76 Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Coss Figure 63: Coss connection diagram 8020-900-01 Rev. C / March 2017 6-23...
  • Page 77 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Figure 64: Coss block diagram schematic 6-24 8020-900-01 Rev. C / March 2017...
  • Page 78: Device Connections For Power Mosfet Capacitance Measurements

    Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Device connections for power MOSFET capacitance measurements For both component-level and circuit-level capacitance measurements, the connections between the device connections panel of the Model 8020 and the DUT are the same. The following diagram illustrates connections for high voltage C-V measurements up to 3 kV.
  • Page 79: Open And Short Compensation

    Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Open and short compensation Perform open and short compensation to remove error due bias tee impedance as well as the stray resistance, capacitance and inductance in the test setup. For more information on the importance of open and short compensation, refer to Optimizing cables and connections for high voltage C-V measurements...
  • Page 80 Model 8020 High Power Interface Panel Applications Manual Section 6: Applications To perform an open compensation for a Cgs measurement, remove the DUT or lift the probes on a probe station to disconnect from the device, and then run an open compensation in the ACS Basic software.
  • Page 81 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual To perform an open compensation for a Cgs measurement, remove the DUT or lift the probes on a probe station to disconnect from the device, and then run an open compensation in the ACS Basic software.
  • Page 82 Model 8020 High Power Interface Panel Applications Manual Section 6: Applications To perform an open compensation for a Cds measurement, remove the DUT or lift the probes on a probe station to disconnect from the device, and then run an open compensation in the ACS Basic software.
  • Page 83 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Cgd / Crss To perform an open compensation for a Cgd measurement, remove the DUT or lift the probes on a probe station to disconnect from the device, and then run an open compensation in the ACS Basic software.
  • Page 84 Model 8020 High Power Interface Panel Applications Manual Section 6: Applications Ciss To perform an open compensation for a Ciss measurement, remove the DUT or lift the probes on a probe station to disconnect from the device, and then run an open compensation in the ACS Basic software.
  • Page 85 Section 6: Applications Model 8020 High Power Interface Panel Applications Manual Coss To perform an open compensation for a Coss measurement, remove the DUT or lift the probes on a probe station to disconnect from the device, and then run an open compensation in the ACS Basic software.
  • Page 86: Introduction

    Section 7 Measurement considerations In this section: Introduction ................7-1 2-wire (local) vs. 4-wire (remote) sensing for DC I-V measurements .............. 7-2 Optimizing cables and connections for low current DC measurements ..........7-4 Suppressing device oscillations for DC and pulsed DC measurements ........... 7-4 Optimizing connections for high current DC pulses ....
  • Page 87: 2-Wire (Local) Vs. 4-Wire (Remote) Sensing For Dc I-V Measurements

    Section 7: Measurement considerations Model 8020 High Power Interface Panel Applications Manual 2-wire (local) vs. 4-wire (remote) sensing for DC I-V measurements This information is relevant for DC IV measurements only. HV C-V measurements made through the 8020 are 2-wire (local) sense only. The 2-wire sensing method requires only two test leads.
  • Page 88 Model 8020 High Power Interface Panel Applications Manual Section 7: Measurement considerations The 4-wire sensing method, as shown in the following figure, minimizes or eliminates the effects of lead resistance by measuring the voltage across the resistor under test with a second set of test leads.
  • Page 89: Optimizing Cables And Connections For Low Current Dc Measurements

    Section 7: Measurement considerations Model 8020 High Power Interface Panel Applications Manual Optimizing cables and connections for low current DC measurements Ensuring proper connections between the instrumentation and the device under test (DUT) is key to optimizing low current DC measurements. Leakage currents are caused by stray resistance paths between instruments and the DUTs.
  • Page 90: Optimizing Connections For High Current Dc Pulses

    Model 8020 High Power Interface Panel Applications Manual Section 7: Measurement considerations Optimizing connections for high current DC pulses The Model 8020 is capable of carrying up to 100 A pulses from two Model 2651A SMU instruments. You can connect two Model 2651A SMU instruments to the Model 8020, and the SMU instruments are connected in parallel.
  • Page 91: Optimizing Cables And Connections For High Voltage C-V Measurements

    Section 7: Measurement considerations Model 8020 High Power Interface Panel Applications Manual Optimizing cables and connections for high voltage C-V measurements Successful C-V measurements require a precise coaxial cabling setup. The Model 4210-CVU C-V instrument is a four-terminal instrument that includes remote sense capability. A C-V meter includes an AC voltage source and an AC ammeter.
  • Page 92 Model 8020 High Power Interface Panel Applications Manual Section 7: Measurement considerations The Model 8020 4-wire measurements for the C-V instrument are terminated at the instrument panel. From the instrument panel out to the DUTs, the C-V measurement is a 2-wire measurement. Do not connect the Sense HI and Sense LO terminals to the DUTs.
  • Page 93 Section 7: Measurement considerations Model 8020 High Power Interface Panel Applications Manual Small capacitance measurements are high impedance and are particularly affected by the stray capacitance in the test setup. During open compensation, stray capacitance is measured so that it may be removed from the calculation of the DUT capacitance.
  • Page 94: Frequently Asked Questions

    Section 8 Frequently asked questions In this section: Why does my instrument generate an interlock error / warning? ............8-1 Why are my DC current measurements unstable? ....8-2 Can I break the parallel connection of the high-current SMUs? 8-2 Can I operate the 8020 with the top cover off? ......
  • Page 95: Why Are My Dc Current Measurements Unstable

    Section 8: Frequently asked questions Model 8020 High Power Interface Panel Applications Manual Why are my DC current measurements unstable? Several factors contribute to unstable current measurements. Such factors vary based on whether the measurement is for low current or high current measurements. For low current measurements, triaxial cabling and connections enable shielded cables and guarding to the DUT, which are important for low current measurements.
  • Page 96: Why Is The Pulse Rising Edge So Slow For My Smu

    Model 8020 High Power Interface Panel Applications Manual Section 8: Frequently asked questions Why is the pulse rising edge so slow for my SMU? For the high voltage and 200 V channels, there are two reasons for degraded pulses or rise time through the Model 8020: 1.
  • Page 97: Index

    Index Connecting to common LO for applications > 1.5 ADC • 2-9, 4-7 2-terminal device connections for C-V Connecting to protective earth • 2-3, 5-11 measurements • 6-10 Connecting to the Model 8020 • 3-1 2-terminal device connections for I-V measurements connections •...
  • Page 98 Index Model 8020 High Power Interface Panel Applications Manual interlock • 2-5, 2-6, 2-7, 2-9 Internal protection circuitry • 4-8 Introduction • 4-5, 7-1 Table I-V mode • 5-4, 5-5, 5-6 Four available bias tee modes • 5-5 troubleshooting FAQs • 5-1 Locating and mounting the Model 8020 •...
  • Page 99 Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments. All other trademarks and trade names are the property of their respective companies. Keithley Instruments Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-800-935-5595 • www.tek.com/keithley A Gr eater M easur e of C onfi dence 12/15...