background image

 

Model 2657A-PM-200 Protection Module 

Keithley Instruments, Inc.

 

User's Guide

 

28775 Aurora Road 
Cleveland, Ohio 44139 
1-888-KEITHLEY 

http://www.keithley.com

 

 

  

PA-1055 Rev. A / February 2012 

 

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:  

 

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.  

Summary of Contents for 2657A-PM-200

Page 1: ...t 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...

Page 2: ...e 2 Model 2657A PM 200 grounding The standard triaxial IN connectors are used for connection to the SMU Maximum clamped voltage on the IN connectors is 240 VDC The high voltage triaxial connectors are...

Page 3: ...m in unclamped condition Pulsed current carrying capability 10 A maximum at 1 duty cycle in unclamped condition Maximum protection active current User must limit current to 120 mA in clamped condition...

Page 4: ...ions for 4 wire sensing For 2 wire applications the SH sense HI connectors of the Model 2657A PM 200 are not used Connecting the Model 2600 TRIAX to the Model 2657A PM 200 connects the LO terminal of...

Page 5: ...Model 2657A PM 200 Protection Module PA 1055 Rev A February 2012 5 Figure 4 Connections for a Model 2611A or 2612A...

Page 6: ...connection to the device under test DUT The drawing shows connections for 4 wire sensing For 2 wire applications the SH sense HI connectors of the Model 2657A PM 200 are not used Do not convert triax...

Page 7: ...Model 2657A PM 200 Protection Module PA 1055 Rev A February 2012 7 Figure 5 Connections for a Model 2635A or 2636A...

Page 8: ...d use the OUT connectors for connection to the device under test DUT The drawing shows connections for 4 wire sensing For 2 wire applications the SH sense HI connectors of the Model 2657A PM 200 are n...

Page 9: ...al difference between the two circuits in excess of 100 mV may result in compromised measurements Large potential differences can be created when there is significant lead resistance and current flowi...

Page 10: ...the Model 2657A PM 200 are not used When using multiple SMUs that are installed in the Model 4200 SCS each SMU needs its own protection module To achieve adequate voltage protection connect the GNDU S...

Page 11: ...Model 2657A PM 200 Protection Module PA 1055 Rev A February 2012 11 Figure 7 Connections for a Model 4200 SCS SMU...

Page 12: ...device is connected between Guard and LO Low leakage diodes are used to connect both HI and Sense HI to the Guard terminal This enables the protection module to protect a SMU connected to the IN term...

Page 13: ...of the protection module a Connect the SMU Force HI terminal to the center conductor of the SH IN triaxial connector of the Model 2657A PM 200 b Connect the SMU Force LO terminal to the inner shield o...

Page 14: ...nductor of the HI OUT triaxial connector of the Model 2657A PM 200 b Connect the SMU Force LO terminal to the inner shield of the HI OUT triaxial connector of the Model 2657A PM 200 Figure 10 Connecti...

Page 15: ...must be rated to double the maximum capability of the test equipment in the system and the two green yellow ground cables for the Model 2657A PM 200 must be connected to protective earth safety groun...

Page 16: ...ial connector of the protection module a Connect the SMU force HI terminal to the inner shield of the LO SL IN triaxial connector of the Model 2657A PM 200 b Connect the SMU force LO terminal to the o...

Page 17: ...ng a nonconductive test fixture it must be rated to double the maximum capability of the test equipment in the system and the two green yellow ground cables for the Model 2657A PM 200 must be connecte...

Page 18: ...off the HV SMU output 10 Connect the scope across the output terminals of the HV SMU 11 Configure the HV SMU to source voltage 12 Program the voltage source level to 300 V 13 Turn on the HV SMU outpu...

Page 19: ...the Model 2657A PM 200 b Connect the SMU Force LO terminal to the inner shield of the LO SL OUT triaxial connector of the Model 2657A PM 200 Figure 14 Connections for verification procedure F 2 Config...

Page 20: ...scope has a ramped waveform The voltage should ramp up to at least 150 V and then clamp to less than 50 V 15 Turn off the HV SMU output 16 Program the voltage source level to 300 V 17 Turn on the HV...

Reviews: