Keithley 3706A, 3762 User Manual

www.tek.com/keithley

Model 3762
10-Channel High Voltage Multiplexer Card

User’s Manual

3762-900-01 Rev. A / July 2017

*P3762-900-01A*

3762-900-01A

Model 3762

10-Channel High Voltage Multiplexer Card

User's Manual

© 2017, Keithley Instruments

Cleveland, Ohio, U.S.A.

All rights reserved.

Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part,

without the prior written approval of Keithley Instruments is strictly prohibited.

These are the original instructions in Engli sh.

All Keithley Instruments product names are trademarks or registered trademarks of Keithley
Instruments. Other brand names are trademarks or registered trademarks of their respective

holders.

Microsoft, Visual C++, Excel, and Windows are either registered trademarks or trademarks of

Microsoft Corporation in the United States and/or other countries.

Document number: 3762-900-01 Rev. A / July 2017

Safety precaut ions

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 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 insta llat ion 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 w ith 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 Instruments 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 sourc es to swit ching car d s, inst all 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. Maximum signal levels are defined in the
specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.

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 hazard. The user must refer to the operating instructions located in the

user documentation in all cases where the symbol is mark ed on the instr u ment .

The

symbol on an instrument means warning, 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 h az ards that coul d dama ge the instrument. Such damage may
invalidate the warranty.

The CAUTION heading with the

symbol in the user documentation explains hazards that could result in moderate or minor
injury or damage the instrument. Always read the associated information very carefully before performing the indicated
procedure. Damage to the instrument 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 compone nt s in mains cir cu its — inc lud ing 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. The detachable mains power cord provided with the
instrument may only be replaced with a similarly rated power cord. 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.

Unless otherwise noted in product-specific literature, Keithley Instruments instruments are designed to operate indoors only, in
the following environment: Altitude at or below 2,000 m (6,562 ft); temperature 0 °C to 50 °C (32 °F to 122 °F); and pollution
degree 1 or 2.

To clean an instrument, use a cloth dampened with deionized water 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 June 2017.

Table of contents

Introduction ............................................................................................................... 1-1

Your multiplexer card ........................................................................................................... 1-1

System switch / multimeter card compatibility ..................................................................... 1-1

Extended warranty ............................................................................................................... 1-2

Series 3700A documentation ............................................................................................... 1-2

Contact information .............................................................................................................. 1-2

General information .............................................................................................................. 1-2

Specifications ....................................................................................................................... 1-3

Installation and connections .................................................................................... 2-1

Handling precautions ........................................................................................................... 2-1

Unpack and inspect .............................................................................................................. 2-1

Card connectors ................................................................................................................... 2-2

Card installation ................................................................................................................... 2-2

General operation ..................................................................................................... 3-1

General operation ................................................................................................................ 3-1

Safety hazards .......................................................................................................................... 3-1

Wire selection and preparation .................................................................................................. 3-2

Wiring ........................................................................................................................................ 3-3

Installation and removal ............................................................................................................ 3-3

Operation considerations ......................................................................................... 4-1

Cables .................................................................................................................................. 4-1

External factors .................................................................................................................... 4-1

Reactive loads ...................................................................................................................... 4-2

Capacitive loads ........................................................................................................................ 4-2

Inductive loads .......................................................................................................................... 4-3

Make a modification ............................................................................................................. 4-3

Typical applications .................................................................................................. 5-1

Model 3762 typical applications ........................................................................................... 5-1

Shielded application .................................................................................................................. 5-1

Guarded application .................................................................................................................. 5-2

Driven guard application ........................................................................................................... 5-2

Four-wire application ................................................................................................................. 5-3

Switch terminology ................................................................................................... 6-1

Switch terminology ............................................................................................................... 6-1

Table of contents

User's Manual

Model 3762 10-Channel High Voltage Multiplexer Card

Index ........................................................................................................................... I-1

Specifications ........................................................................... 1-3

Model 3706

3720, 3721, 3722, 3723, 3724, 3730, 3731, 3732, 3740,

3765

In this section:

Your multiplexer card ............................................................... 1-1

System switch / multimeter card compatibi lity .......................... 1-1

Extended warranty ................................................................... 1-2

Series 3700A documentation ................................................... 1-2

Contact information .................................................................. 1-2

General information .................................................................. 1-2

Your multiplexer card

Thank you for choosing a Keithley Instruments product. The Model 3762 is a 10-channel high-voltage
card that is capable of switching voltages to 1000 V peak or currents to 0.5 A. The current carry
capacity of each relay contact is 1 A. Two-pole channels switch both circuit high and low for full
floating measurements. A guard input common to all channels is provided for shielding or as a guard
driven from a single instr u ment.

Section 1

Introduction

Guards may be isolated by removing jumpers installed at each input. Multiple switched guard circuits
can be achieved by removing the jumper and connecting circuit guard to the low input terminal.

System switch / multimeter card compatibility

The following table lists the cards that are compatible with the 3706 and 3706A.

Mainframe System Switch / Multimeter Compatible plug-in cards

3750

Model 3706A All plug-in cards compatible with the 3706A mainframe, plus

the following card models:

• 3760

• 3761

• 3762

•

The 3762 is designed for use only with the Model 3706A System Switch / Multimeter. Using the 3762
with the Model 3706 mainframe can cause unpredictable behavior.

Section

User's Manual

3700AS-903-01

Series 3700A System
Guide

Hardware and software requiremen ts, sw itchi ng card
panel and remote interface operation.

Switch/Multimeter User's Manual

controlling channels.

3700AS-901-01

Series 3700A System
Manual

Information about controlling the Series 3700A from a

Maximum signal levels

Voltage: 1000 V peak

Carry current: 1 A, peak or DC

Switching current: 0.5 A, RMS or DC

Switching power: 10 W

1: Introduction Model 3762 10-Channel High Voltage Multiplexer Card

Extended warranty

Additional years of warranty coverage are available on many products. These valuable contracts
protect you from unbudgeted service expenses and provide additional years of protection at a fraction
of the price of a repair. Extended warranties are available on new and existing products. Contact your
local Keithley Instruments office, sales partner, or distributor for details.

Series 3700A documentation

Complete documentation for the Series 3700A System Switch/Multimeter instruments is available at
the Keithley Instruments website
documentation.

(http://www.tek.com/keithley). The following is a list of available

Document
number

3700AS-900-01 Series 3700A System

Document name Content description

Switch/Multimeter Quick Start

Switch/Multimeter Reference

Contact information

If you have any questions after you revie w the infor mation in this documentation, please co ntac t your
local Keithley Instruments office, sales partner, or distributor. You can also call the corporate
headquarters of Keithley Instruments (toll-free inside the U.S. and Canada only) at 1-800-935-5595,
or from outside the U.S. at [phone]. For worldwide contact numbers, visit the

Instruments website (http://www.tek.com/keithley).

General information

installation instructions, and a brief description of front-

Information about scanning, re ading , wr iting, and

remote interface.

Keithley

General ratings for the 3762 are listed in the following table:

Category Specification

1-2 3762-900-01 Rev. A / July 2017