Keithley 2657A-PM-200 Manuel utilisateur

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 1

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.

Model 2657A-PM-200 Protection Module

2 PA-1055 Rev. A / February 2012

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). Connection of

both ground cables to protective earth are necessary for safety.

Figure 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 used for connection to the device under test. Do

not exceed 3280 V on the OUT connectors.

•The center conductor of the LO,SL connectors is sense LO and the inner shield is LO. The outer shield (shell)

is chassis ground.

•The center conductor of the HI connectors is HI and the inner shield is guard. The outer shield (shell) is chassis

ground.

•The center conductor of the SH connectors is sense HI and the inner shield is guard. The outer shield (shell) is

chassis ground.

Model 2657A-PM-200 Protection Module

PA-1055 Rev. A / February 2012 3

Electrical characteristics

•Leakage: < 10 pA at 200 V typical

•DC current carrying capability: 1.5 A maximum 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 (~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

Model 2657A-PM-200 Protection Module

4 PA-1055 Rev. A / February 2012

Connections using a Model 2611A or 2612A SMU

Required accessories:

•One Model 2600-TRIAX adapter per channel

•Two or three standard triaxial cables (either Model 7078-TRX or 4200-TRX) per channel

•Two or three high-voltage (HV) triaxial cables (Model CA-553 or CA-554) per channel

Connection summary

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).

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.

Connecting the Model 2600-TRIAX to the Model 2657A-PM-200 connects the LO terminal of the

Model 2611A or 2612A to protective earth (safety ground).

Do not convert triaxial cables to BNC cables. Using BNC cables removes protection from the Model

2611A or 2612A and may result in damage to the SMU. You must use triaxial cables to connect to the

lower-voltage SMU.

When using the 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.

Large potential differences can be created when there is significant lead resistance and current

flowing in the HI lead. To minimize lead resistance, minimize the distance between the Model 2657A-

PM-200 and the device under test.

Model 2657A-PM-200 Protection Module

PA-1055 Rev. A / February 2012 5

Figure 4: Connections for a Model 2611A or 2612A

Model 2657A-PM-200 Protection Module

6 PA-1055 Rev. A / February 2012

Connections using a Model 2635A or 2636A SMU

Required accessories:

•Two or three standard triaxial cables (either Model 7078-TRX or 4200-TRX) per source-measure unit (SMU)

channel

•Two or three high-voltage (HV) triaxial cables (Model CA-553 or CA-554) per SMU channel

Connection summary

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).

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 triaxial cables to BNC cables. Using BNC cables removes protection from the Model

2635A or 2636A and may result in damage to the SMU. You must use triaxial cables to connect to the

lower-voltage SMU.

When using the 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.

Large potential differences can be created when there is significant lead resistance and current

flowing in the HI lead. To minimize lead resistance, minimize the distance between the Model 2657A-

PM-200 and the device under test.

Model 2657A-PM-200 Protection Module

PA-1055 Rev. A / February 2012 7

Figure 5: Connections for a Model 2635A or 2636A

Model 2657A-PM-200 Protection Module

8 PA-1055 Rev. A / February 2012

Connections using a Model 4200-SCS SMU (with Model 4200-PA)

If ordered, a Model 4200-PA remote preamplifier (preamp) for a source-measure unit (SMU) is installed at the

factory when the Model 4200-SCS is ordered.

Required accessories to connect one Model 4200-SMU or 4210-SMU (with the Model 4200-PA):

•Two or three Model 4200-TRX cables

•Two or three high-voltage (HV) triaxial cables (Model CA-553 or CA-554)

Connection summary

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).

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.

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 Sense terminal to the

LO,SL (LO and sense LO) connector of each protection module using triax tees (such as the Keithley

Model 237-TRX-T) and additional triaxial cables (Model 4200-TRX).

Connecting the Model 4200-SMU or 4210-SMU to the Model 2657A-PM-200 connects the LO

terminal of the SMU to protective earth (safety ground).

Do not convert triaxial cables to BNC cables. Using BNC cables removes protection from the Model

4200-SCS SMU and may result in damage to the SMU. You must use triaxial cables to connect to the

lower-voltage SMU.

Model 2657A-PM-200 Protection Module

PA-1055 Rev. A / February 2012 9

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.

Large potential differences can be created when there is significant lead resistance and current

flowing in the HI lead. To minimize lead resistance, minimize the distance between the Model 2657A-

PM-200 and the device under test.

Figure 6: Connections for a Model 4200-SCS SMU (with preamp)

Model 2657A-PM-200 Protection Module

10 PA-1055 Rev. A / February 2012

Connections using a Model 4200-SCS SMU

Required accessories to connect one Model 4200-SMU or 4210-SMU (without the Model 4200-PA Remote

PreAmp):

•One Model 4200-TRX cable

•One or two Model 4200-MTRX cables

•Two or three high-voltage (HV) triaxial cables (Model CA-553 or CA-554)

Connection summary

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).

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.

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 Sense terminal to the

LO,SL (LO and sense LO) connector of each protection module using triax tees (such as the Keithley

Model 237-TRX-T) and additional triaxial cables (Model 4200-TRX).

Connecting the Model 4200-SMU or 4210-SMU to the Model 2657A-PM-200 connects the LO

terminal of the SMU to protective earth (safety ground).

When using the 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.

Large potential differences can be created when there is significant lead resistance and current

flowing in the HI lead.To minimize lead resistance, minimize the distance between the Model 2657A-

PM-200 and the device under test.

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