Tektronix Keithley 2600B-PM-1 User manual

Model 2600B-PM-1
200 V Protection Module with 1 A Clamp
071322000 / October 2014 *071322000* 1
Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595
http://www.keithley.com
Description
The Model 2600B-PM-1 200 V Protection Module with 1 A Clamp 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 maximum DC current is 100 mA, and the clamp prevents < 100 µs transient current spikes up to 1 A.
Figure 1: Model 2600B-PM-1 protection module
The protection module is designed for use with the following lower-voltage SMUs:
•Model 2611B Single-Channel System SourceMeter®Instrument
•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:
a. Model 4200-SMU Medium Power Source-Measure Unit (with or without the Model 4200-PA Remote
PreAmp Option)
b. Model 4210-SMU High Power Source-Measure Unit (with or without the Model 4200-PA Remote
PreAmp Option)

Model 2600B-PM-1
2 071322000 / October 2014
The protection module prevents damage due to transient overcurrent conditions. It is intended for use in
applications where a device breakdown or other potential failure could connect the high voltage output of the
1000 V power supply or SMU instrument, such as the Keithley Instruments Model 2410 or 237.
The Model 2600B-PM-1 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 2600B-PM-1, in the case of device failure, the current from all
power sources, including SourceMeter instruments and power supplies, should be limited to 100 mA
DC or less.
The Model 2600B-PM-1 protection module must be connected to protective earth (safety
ground) using the supplied green and yellow ground cables (Model CA-568). Connection of
the ground cable to protective earth is necessary for safety.
Figure 2: Model 2600B-PM-1 grounding
The standard triaxial IN connectors are used to connect the SMU. Maximum clamped voltage on the IN
connectors is 240 VDC.
•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.
There are two high-voltage coaxial connectors used for connection to the device under test (DUT).
•The OUT connector is intended for use in applications involving a 1000 V power supply or SMU instrument,
such as the Keithley Instruments Model 2410 or 237.

Model 2600B-PM-1
071322000 / October 2014 3
Mechanical dimensions
Figure 3: Model 2600B-PM-1 200 V protection module
Connections using a Model 2611B or 2612B SMU
Required accessories:
•One Model 2600-TRIAX adapter per channel
•Six standard triaxial cables (either Model 7078-TRX or 4200-TRX) per source-measure unit (SMU) channel

Model 2600B-PM-1
4 071322000 / October 2014
Connection summary
Refer to the next figure on how to connect a Model 4200-PA preamp and the GNDU (ground unit) to the Model
2600B-PM-1. Make sure to use the IN connectors of the Model 2600B-PM-1 for connection to the Model
4200-SCS and use the OUT connector for connection to the DUT.
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 triaxial 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 2600B-PM-1 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.
Figure 4: Model 2600B-PM-1 connections for Model 2611 or 2612

Model 2600B-PM-1
071322000 / October 2014 5
Connections using a Model 2635B or 2636B SMU
Six standard triaxial cables (either Model 7078-TRX or 4200-TRX) are required per SMU channel.
Connection summary
Refer to the next figure on how to connect source-measure unit (SMU) channels of the Model 2635B or 2636B
to the Model 2600B-PM-1. Only 2-wire applications are supported.
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.
Figure 5: Model 2600B-PM-1 connections for Model 2635 or 2636

Model 2600B-PM-1
6 071322000 / October 2014
Connections using a Model 4200-SCS SMU (with Model 4200-PA)
If ordered, a Model 4200-PA remote preamplifier for a SMU is installed at the factory when the Model
4200-SCS is ordered.
Six Model 4200-TRX cables are required for this connection to connect one Model 4200-SMU or 4210-SMU
(with the Model 4200-PA):
•Configurations with more than one SMU may require a triaxial tee to connect to the SLO/LO terminal.
Connection summary
Refer to the next figure on how to connect a Model 4200-PA preamp and the GNDU (ground unit) to the Model
2600B-PM-1. Make sure to use the IN connectors of the Model 2600B-PM-1 for connection to the Model
4200-SCS and use the OUT connector for connection to the DUT. Only 2-wire applications are supported.
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 triaxial 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 2600B-PM-1 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.
Figure 6: Model 2600B-PM-1 connections for 4200-SCS SMU with 4200-PA

Model 2600B-PM-1
071322000 / October 2014 7
Connections using a Model 4200-SCS SMU
Required accessories to connect one Model 4200-SMU or 4210-SMU (without the Model 4200-PA Remote
Preamplifier):
•One Model 4200-TRX cable
•One Model 4200-MTRX cables
•Configurations with more than one Model 4200-SCS SMU may require a triaxial tee
Connection summary
Refer to the next figure on how to connect a Model 4200-SMU or 4210-SMU and the GNDU (ground unit) to the
Model 2600B-PM-1. Make sure to use the IN connectors of the Model 2600B-PM-1 for connection to the Model
4200-SCS and use the OUT connector for connection to the device DUT.
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 triaxial 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 2600B-PM-1 connects the LO terminal of the SMU to
protective earth (safety ground).
Figure 7: Model 2600B-PM-1 connections for Model 4200-SCS SMU

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. Read and follow all installation, operation, and maintenance information carefully before using
the product. Refer to the user documentation for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the
equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the
instrument. They must be protected from electric shock and contact with hazardous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the line
voltage or replacing consumable materials. Maintenance procedures are described in the user documentation. The procedures
explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, perform safe installations, and repair products. Only properly trained
service personnel may perform installation and service procedures.
Keithley Instruments products are designed for use with electrical signals that are measurement, control, and data I/O
connections, with low transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high
transient overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient
overvoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected to
mains. These instruments will be marked as category II or higher.
Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test
fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than
30 V RMS, 42.4 V peak, or 60 VDC are present. A good safety practice is to expect that hazardous voltage is present in any
unknown circuit before measuring.
Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators
are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock. If
the circuit is capable of operating at or above 1000 V, no conductive part of the circuit may be exposed.
Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance-limited
sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective
devices to limit fault current and voltage to the card.
Before operating an instrument, ensure that the line cord is connected to a properly-grounded power receptacle. Inspect the
connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.
When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input
power disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under
test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting
cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.
Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth)
ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the
voltage being measured.

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, as defined in the specifications and operating
information, and as shown on the instrument or test fixture panels, or switching card.
When fuses are used in a product, replace with the same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as protective earth (safety ground)
connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use
of a lid interlock.
If a screw is present, connect it to protective earth (safety ground) using the wire recommended in the user documentation.
The symbol on an instrument means caution, risk of danger. The user must refer to the operating instructions located in the
user documentation in all cases where the symbol is marked on the instrument.
The symbol on an instrument means caution, risk of electric shock. Use standard safety precautions to avoid personal
contact with these voltages.
The symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.
The symbol indicates a connection terminal to the equipment frame.
If this symbol is on a product, it indicates that mercury is present in the display lamp. Please note that the lamp must be
properly disposed of according to federal, state, and local laws.
The WARNING heading in the user documentation explains dangers that might result in personal injury or death. Always read
the associated information very carefully before performing the indicated procedure.
The CAUTION heading in the user documentation explains hazards that could damage the instrument. Such damage may
invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits — including the power
transformer, test leads, and input jacks — must be purchased from Keithley Instruments. Standard fuses with applicable national
safety approvals may be used if the rating and type are the same. Other components that are not safety-related may be
purchased from other suppliers as long as they are equivalent to the original component (note that selected parts should be
purchased only through Keithley Instruments to maintain accuracy and functionality of the product). If you are unsure about the
applicability of a replacement component, call a Keithley Instruments office for information.
To clean an instrument, use a damp cloth or mild, water-based cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with
no case or chassis (e.g., a data acquisition board for installation into a computer) should never require cleaning if handled
according to instructions. If the board becomes contaminated and operation is affected, the board should be returned to the
factory for proper cleaning/servicing.
Safety precaution revision as of January 2013.