Keithley 2657A-PM-200 User Manual
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Keithley 2657A-PM-200 User Manual

Keithley 2657A-PM-200 User Manual

Protection module
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Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
1-888-KEITHLEY
http://www.keithley.com
Description
The Model 2657A-PM-200 Protection Module (PM) is a stand-alone module that protects certain lower-voltage
source-measure units (SMUs) that are part of a testing configuration from damage by voltage sources that are
greater than 220 V.
The protection module is designed for use with the following lower voltage SMUs:
•
Model 2611A Single-Channel System SourceMeter Instrument
•
Model 2612A Dual-Channel System SourceMeter Instrument
•
Model 2635A Single-Channel System SourceMeter Instrument
•
Model 2636A Dual-Channel System SourceMeter Instrument
•
Model 4200-SCS Semiconductor Characterization System SMUs:
•
Model 4200-SMU Medium Power Source-Measure Unit (with or without the Model 4200-PA Remote
PreAmp Option)
•
Model 4210-SMU High Power Source-Measure Unit (with or without the Model 4200-PA Remote PreAmp
Option)
The protection module is intended for use in applications where a device breakdown or other potential failure could
connect the high-voltage output of the Model 2657A High Power System SourceMeter Instrument to a lower
voltage SMU.
The Model 2657A-PM-200 does not protect the Model 2601A Single-Channel System
SourceMeter Instrument or the Model 2602A Dual-Channel System SourceMeter Instrument. Do
not use the protection module with these source-measure instruments.
PA-1055 Rev. A / February 2012
Model 2657A-PM-200 Protection Module
Figure 1: Model 2657A-PM-200
User's Guide
1

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Summary of Contents for Keithley 2657A-PM-200

  • Page 1 1-888-KEITHLEY http://www.keithley.com Description The Model 2657A-PM-200 Protection Module (PM) is a stand-alone module that protects certain lower-voltage source-measure units (SMUs) that are part of a testing configuration from damage by voltage sources that are greater than 220 V. Figure 1: Model 2657A-PM-200 The protection module is designed for use with the following lower voltage SMUs: •...
  • Page 2 Model 2657A-PM-200 Protection Module To prevent damage to the Model 2657A-PM-200 in the case of device failure, the current from the high-voltage source should be limited to 120 mA or less. The Model 2657A-PM-200 protection module must be connected to protective earth (safety ground) using the the supplied green-yellow ground cables (Model CA-568).

  • Page 3: Electrical Characteristics

    Maximum protection active current: User must limit current to <120 mA in clamped condition (~230 V) • Protection voltage: • Minimum: 220 VDC • Typical: 230 VDC • Maximum: 240 VDC • LO to GND voltage: 30 VDC typical Mechanical dimensions Figure 3: Model 2657A-PM-200 dimensions PA-1055 Rev. A / February 2012...
  • Page 4 Use the connection drawing below to connect source-measure unit (SMU) channels of the Model 2611A or 2612A to the Model 2657A-PM-200. For each channel, make sure to use the IN connectors of the the Model 2657A-PM- 200 for connection to the Model 2600-TRIAX and use the OUT connectors for connection to the device under test (DUT).
  • Page 5 Model 2657A-PM-200 Protection Module Figure 4: Connections for a Model 2611A or 2612A PA-1055 Rev. A / February 2012...
  • Page 6 Use the connection drawing below to connect source-measure unit (SMU) channels of the Model 2635A or 2636A to the Model 2657A-PM-200. For each channel, make sure to use the IN connectors of the Model 2657A-PM-200 for connection to the Model 2635A or 2636A and use the OUT connectors for connection to the device under test (DUT).
  • Page 7 Model 2657A-PM-200 Protection Module Figure 5: Connections for a Model 2635A or 2636A PA-1055 Rev. A / February 2012...
  • Page 8 Use the connection drawing below to connect a Model 4200-PA preamp and the GNDU (ground unit) to the Model 2657A-PM-200. Make sure to use the IN connectors of the Model 2657A-PM-200 for connection to the Model 4200- SCS and use the OUT connectors for connection to the device under test (DUT).
  • Page 9 Model 2657A-PM-200 Protection Module When using the Model 2657A-PM-200, HI and SH (sense HI) should be connected together at the device under test. A potential difference between the two circuits in excess of 100 mV may result in compromised measurements.

  • Page 10: Connections Using A Model 4200-Scs Smu

    Use the connection drawing below to connect a Model 4200-SMU or 4210-SMU and the GNDU (ground unit) to the Model 2657A-PM-200. Make sure to use the IN connectors of the Model 2657A-PM-200 for connection to the Model 4200-SCS and use the OUT connectors for connection to the device under test (DUT).
  • Page 11 Model 2657A-PM-200 Protection Module Figure 7: Connections for a Model 4200-SCS SMU PA-1055 Rev. A / February 2012...
  • Page 12 The Zener diodes between LO and chassis and Sense LO and chassis limit the maximum voltage between LO and chassis ground to 30 V to 40 V. Use the following procedures to verify that the Model 2657A-PM-200 is operating properly. PA-1055 Rev. A / February 2012...

  • Page 13: Verify Diodes Between Hi / Sense Hi And Guard

    Model 2657A-PM-200 Protection Module Verify diodes between HI / sense HI and guard A Keithley SourceMeter instrument capable of sourcing 10 mA at 10 V is required for verification procedures A and B. Verification procedure A Verify the operation of the diodes between Sense HI and Guard of the Model 2657A-PM-200: 1.
  • Page 14 Model 2657A-PM-200 Protection Module Verification procedure B Verify the operation of the diodes between HI and Guard of the Model 2657A-PM-200: 1. As shown in the connection drawing below, connect the source-measure unit (SMU) to the HI triaxial connector of the protection module: a.

  • Page 15: Verify Diodes Between Lo / Sense Lo And Chassis

    Model 2657A-PM-200 Protection Module Verify diodes between LO / sense LO and chassis A Keithley SourceMeter instrument capable of sourcing 10 mA at 50 V is required for verification procedures C and D. A safety shield must be used whenever hazardous voltages (>30 V RMS, 42 V peak) will be present in the test circuit.
  • Page 16 Connect the SMU force LO terminal to the outer shield (chassis) of the LO,SL IN triaxial connector of the Model 2657A-PM-200. The chassis is available at the outer shield of any of the triaxial connectors on the Model 2657A-PM-200.

  • Page 17: Verify Voltage Protection Device Between Guard And Force Lo

    Not shown in the simplified block diagram are redundant voltage protection devices between the inner shields (guard) of the HI and SH (sense HI) terminals of the Model 2657A-PM-200. Verification procedures E and F checks both of these devices.
  • Page 18 Model 2657A-PM-200 Protection Module Figure 13: Connections for verification procedure E 2. Configure the HV SMU to source current and measure voltage. 3. Program the current source level to 20 mA. 4. Program the voltage limit to 220 V. 5. Turn on the HV SMU output.
  • Page 19 Model 2657A-PM-200 Protection Module Verification procedure F Verify proper operation of the protection device between the inner shields of the HI and LO terminals of the Model 2657A-PM-200: 1. As shown in the connection drawing below, connect the high voltage source-measure unit (HV SMU) to the HI and LO,SL triaxial connectors of the protection module: a.
  • Page 20 Model 2657A-PM-200 Protection Module 13. Turn on the HV SMU output and trigger the scope. 14. Verify that the voltage waveform on the scope has a ramped waveform. The voltage should ramp up to at least 150 V and then clamp to less than 50 V.

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