Tektronix 2290-PM-200 Users Guide

Model 2290-PM-200

Keithley Instruments

28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595

http://www.keithley.com

Protection Module User's Guide

Description

The Model 2290-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 2290-PM-200

The protection module is for use with the following lower-voltage SMUs:

• Model 2611B Single-Channel System SourceMeter

• Model 2612B Dual-Channel System SourceMeter Instrument

• Model 2635B Single-Channel System SourceMeter Instrument

• Model 2636B Dual-Channel System SourceMeter Instrument

• Model 4200-SCS Semiconductor Characterization System SMUs:

• Model 4200-SMU Medium Power Source-Measure Unit

• Model 4210-SMU High Power Source-Measure Unit

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Instrument

Model 2290-PM-200 Protection Module User's Guide

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 2290-5 or Mod el 229 0-10 hi g h-voltage power supply
instrument to a lower-voltage SMU.

The Model 2290-PM-200 does not protect the Model 2601B Single-Channel System SourceMeter
Instrument or the Model 2602B Dual-Channel System SourceMeter Instrument. Do not use the
protection module with these source-measure instruments.

To prevent damage to the Model 2290-PM-200 in the case of device failure, the current from all
power sources, including SourceMeter instruments and power supplies, should be limited to 100 mA.

The Model 2290-PM-200 protection module must be connected to protectiv e earth terminals
(safety grounds) using the supplied green-yellow ground cables (Model CA-568). Connection
of ground cables to protective ear th ter minals is necessary for safety.

Figure 2: Model 2290-PM-200 grounding

The standard triaxial IN connectors are used to connect the SMU. Maximum clamped voltage on the IN
connectors is 240 V DC.

• The center conductor of the LO connector inner shield is connected to LO. The outer shield (shell) is
chassis ground.

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

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Model 2290-PM-200 Protection Module User's Guide

There are two high-voltage coaxial connectors used for connection to the device under test (DUT).

• The smaller OUT connector is intended for use in applications that include the Model 2290-5 high-voltage
power supply only. This connector is rated to 5000 V.

• The larger OUT connector is intended for use in applications that include the Model 2290-10 high-voltage
power supply only. This connector is rated to 10000 V.

Electrical char ac ter i stics

• Leakage: < 10 pA at 200 V typical

• DC current carrying capability: 100 mA maximum in unclamped condition

• Pulsed current carrying capability: 10 A maximum at 1% duty cycle in unclamped condition

• Maximum protection active current: You must limit current to <120 mA in clamped condition (~230 V)

• Protection voltage:

• Minimum: 220 V DC

• Typical: 230 V DC

• Maximum: 240 V DC

• Series resistance: 470 Ω ± 10 percent

Mechanical dimensions

Figure 3: Model 2290-PM-200 dimensions

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Model 2290-PM-200 Protection Module User's Guide

Connections using a M odel 2611B or 2612B SMU

Required accessories:

• One Model 2600-TRIAX adapter per channel

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

channel

• One high-voltage (HV) coaxial cable

• Use Model 2290-5-SHV or 2290-5-MHV if you are using the 2290-5 high-voltage power supply

Connection summar y

• Use Model 2290-10-SHVUC or 2290-10-SHV if you are using the 2290-10 high-voltage power supply

Refer to the next figure to connect the Model 2611B or 2612B source-measure unit (SMU) channels to the
Model 2290-PM-200.

Only 2-wire applications are supported.

Connecting the Model 2600-TRIAX to the Model 2290-PM-200 connects the LO terminal of the
Model 2611B or 2612B to protective earth (safety ground).

Do not convert triaxial cables to BNC cables. Using BNC cables may compromise overvoltage
protection and can result in damage to the SMU. You must use triaxial cables to connect to the
lower-voltage SMU.

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Model 2290-PM-200 Protection Module User's Guide

Figure 4: Model 2290-PM-200 connections for Model 261xB using Model 2290-5 power supply

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