www.keithley.com
Model 7705 Control Module
User’s Guide
PA-696 Rev. D / October 2006
A GREATER MEASURE OF CONFIDENCE
WARRANTY
Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation.
During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.
To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in
Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation
prepaid, to the indicated service facility. Repairs will be made and the product returned, transportation prepaid.
Repaired or replaced products are warranted for the balance of the original warranty period, or at least 90 days.
LIMITATION OF WARRANTY
This warranty does not apply to defects resulting from product modification without Keithley’s express written
consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable
batteries, damage from battery leakage, or problems arising from normal wear or failure to follow instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY
DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN
ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT
ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT
OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.
A G R E A T E R M E A S U R E O F C O N F I D E N C E
Keithley Instruments, Inc.
Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139
440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY (534-8453) • www.keithley.com
12/04
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 non-hazardous 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 manual for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product 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 manual. 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, and perform safe installations and repairs of products. Only properly trained
service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category
II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and
data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high
transient over-voltages. Measurement Category II connections require protection for high transient over-voltages often
associated with local AC mains connections. Assume all measurement, control, and data I/O connections are for connection to
Category I sources unless otherwise marked or described in the Manual.
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
30V RMS, 42.4V peak, or 60VDC 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 volts, 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, make sure 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.
5/03
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.
The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of 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 same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth 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 safety earth ground using the wire recommended in the user documentation.
!
The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.
The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined effect of
normal and common mode voltages. Use standard safety precautions to avoid personal contact with these voltages.
The symbol indicates a connection terminal to the equipment frame.
The WARNING heading in a manual 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 a manual 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., 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.
Model 7705 Control Module
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
(440) 248-0400
Fax: (440) 248-6168
www.keithley.com
User’s Guide
Introduction
t^okfkd The information contained in this packing sheet is intended for use by qualified service
personnel only. Do not perform these procedures unless qualified to do so. Failure to
recognize and observe normal safety precautions could result in personal injury or
death.
This document contains information specific to the Model 7705 control module. If you have any questions after reviewing this
information, please contact your local Keithley representative or our Applications Engineers at 1-888-KEITHLEY
(1-888-534-8453, U.S. only) or Telefax: 440-498-2990 (Instrument Products).
The Model 7705 is a 40-channel, single-pole relay module with the following features:
• 40 Independent Form A switches
• Quick-disconnect 50 pin D-shell connector (2 × DB-50)—use with Model 7788.
Connection and Wiring Information
• Designed specifically for use with Keithley’s Model 2700/2750/2701 Systems.
klqb The 7705 module can be used with Keithley Models 2700, 2701, and 2750. All references to the
Model 27xx apply to the Models 2700, 2701, and 2750.
t^okfkd Before operating the Model 27xx with an accessory card, verify that the card is properly
installed and the mounting screws are tightly fastened. If the mounting screws are not
properly connected, an electrical shock hazard may be present.
Connection information
Keep the following in mind when using the Model 7705 module:
• The 7705 module is a non-measurement card. No channels are connected to the internal DMM (the channels cannot
be connected to the backplane).
• Multiple channel operation should be used to close channels on the 7705 module. For remote operation, the
ROUT:MULT commands are used to close channels.
• For remote operation, system (single) channel operation (ROUT:CLOS <list> command) can be used to close
7705
module channels. However, only the specified channel will be closed. All other channels on the card will be
open.
PA-696 Rev. D / October 2006
• Front panel system (single) channel operation cannot be used to close channels on this module. For front panel
operation, system channel operation will cause message “NO MEAS CARD” to be displayed.
• In order to perform measurements, you must use the front panel inputs of the 27xx mainframe. You can still use the
7705 module to control external circuits.
klqb For details on multiple channel operation, refer to Section 2 of the Model 27xx User’s Manual.
• Although the Model 7705 relays are the latching type (relays hold their state even after power has been removed),
all relay states are set to open a few seconds after either a power cycle or a *RST command is issued.
Simplified schematic for Model 7705
Card configuration—connections
t^o k f k d The information in this section is intended for qualified service personnel. Do not
attempt to perform this procedure unless qualified to do so.
Do not exceed the maximum specifications for the Model 7705 module.
klqb When looking at the rear connectors of the Model 7705 module, the connector on the left is P1000
and the connector on the right is P1001.
Model 7705 Pinouts
P1000
17
33
Channel 1
IN
OUT
(Channels 2–39)
IN
Channel 40
OUT
1
18
17
33
P1001
1
18
50
34
Channels 1–20 Channels 21–40
50
34
2
Ta b le 1
Model 7705 channel designations
P1000 P1001
CH PIN CH PIN CH PIN CH PIN CH PIN CH PIN
1 IN 6 8 IN 25 15 IN 39 21 IN 6 28 IN 25 35 IN 39
1 OUT 8 8 OUT 26 15 OUT 40 21 OUT 8 28 OUT 26 35 OUT 40
2 IN 10 9 IN 27 16 IN 41 22 IN 10 29 IN 27 36 IN 41
2 OUT 12 9 OUT 28 16 OUT 42 22 OUT 12 29 OUT 28 36 OUT 42
3 IN 14 10 IN 29 17 IN 43 23 IN 14 30 IN 29 37 IN 43
3 OUT 16 10 OUT 30 17 OUT 44 23 OUT 16 30 OUT 30 37 OUT 44
4 IN 17 11 IN 31 18 IN 45 24 IN 17 31 IN 31 38 IN 45
4 OUT 18 11 OUT 32 18 OUT 46 24 OUT 18 31 OUT 32 38 OUT 46
5 IN 19 12 IN 33 19 IN 47 25 IN 19 32 IN 33 39 IN 47
5 OUT 20 12 OUT 34 19 OUT 48 25 OUT 20 32 OUT 34 39 OUT 48
6 IN 21 13 IN 35 20 IN 49 26 IN 21 33 IN 35 40 IN 49
6 OUT 22 13 OUT 36 20 OUT 50 26 OUT 22 33 OUT 36 40 OUT 50
7 IN 23 14 IN 37 27 IN 23 34 IN 37
7 OUT 24 14 OUT 38 27 OUT 24 34 OUT 38
Power limits
`^rqflk To prevent damage to the card, do not exceed the maximum signal level specifications of
the card. For reactive loads, be sure to use voltage clamping and current limiting as
explained in the “Reactive loads” paragraph.
Maximum signal levels
`^rqflk To prevent overheating or damage to the relays, never exceed the following maximum
signal levels: 300V (DC or RMS) between any two inputs or chassis, 60W (DC, resistive),
125VA (AC, resistive), or 2A switched.
Reactive loads
Model 7705 operation is specified for resistive loads (see “Typical connections—indicator lamp, alarm, and relay” figure).
Reactive loads require voltage clamping (for inductive loads) and current surge limiting (for capacitive loads) to prevent
damage to the relays and to external circuitry. For additional information, refer to the Model 2700/2750/2701 User’s manual.
3
Wire sizes
Make all connections using correct wire size (up to 20 AWG). Use Model 7788 (DB-50 kit) to provide for a high quality
connection to the Model 7705 module. Also, make sure to add supplementary insulation around the harness for voltages above
42V peak (see “Supplementary insulation” figure).
Typical connections—indicator lamp, alarm, and relaySupplementary insulation
Model 7705
IN 1
OUT 1
Alarm
Relay
Indicator
Lamp
Supplementary
Insulation
5V
12V
30V
IN 2
IN 3
IN 4
IN 5
IN 6
OUT 2
OUT 3
OUT 4
OUT 5
OUT 6
Equivalent circuit
Connection log
Make a copy of Table 2 and affix it to the cover of the Model 7705. Use this to record connection information and channel
descriptions as needed.
4
Ta b le 2
Connection Log Model 7705
Channel Color Description Description Color Channel
1 IN IN 21
OUT OUT
2 IN IN 22
OUT OUT
3 IN IN 23
OUT OUT
4 IN IN 24
OUT OUT
5 IN IN 25
OUT OUT
6 IN IN 26
OUT OUT
7 IN IN 27
OUT OUT
8 IN IN 28
OUT OUT
9 IN IN 29
OUT OUT
10 IN IN 30
OUT OUT
11 IN IN 31
OUT OUT
12 IN IN 32
OUT OUT
13 IN IN 33
OUT OUT
14 IN IN 34
OUT OUT
15 IN IN 35
OUT OUT
16 IN IN 36
OUT OUT
17 IN IN 37
OUT OUT
18 IN IN 38
OUT OUT
19 IN IN 39
OUT OUT
20 IN IN 40
OUT OUT
5
6
GENERAL
RELAY SWITCH CONFIGURATION: 40 independent channels of 1-pole
switching. Isolated from internal DMM.
CONTACT CONFIGURATION: 1 pole Form A.
RELAY TYPE: Latching electromechanical.
CONNECTOR TYPE: Two 50-pin female D-sub connectors.
INPUTS
MAXIMUM SIGNAL LEVEL: 300VDC or rms, 2A switched, 60W (DC,
resistive), 125VA (AC, resistive).
CONTACT LIFE: Cold Switching: 10
8
closures.
At Maximum Signal Levels: 10
5
closures.
CHANNEL RESISTANCE (per conductor): <1Ω.
CONTACT POTENTIAL: ≤4μV per contact.
OFFSET CURRENT: <100pA.
ACTUATION TIME: 3ms.
ISOLATION: Channel to Channel: >10
9
Ω, <50pF.
Common Mode: >10
9
Ω, <100pF.
CROSSTALK (1MHz, 50Ω load): <–35dB.
INSERTION LOSS (50Ω source, 50Ω load): <0.3dB below 1MHz, <3dB
below 10MHz.
COMMON MODE VOLTAGE: 300V between any terminal and chassis.
ENVIRONMENTAL
OPERATING ENVIRONMENT:Specified for 0°C to 50°C.
Specified to 80% R.H. at 35°C.
STORAGE ENVIRONMENT: –25°C to 65°C.
WEIGHT: 0.45kg (1 lb).
7705 40-Channel Control Module
Channel 1
(Channels 2–39)
Channel 40
IN
OUT
IN
OUT
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12/04
Specifications are subject to change without notice.
All Keithley trademarks and trade names are the property of Keithley Instruments, Inc.
All other trademarks and trade names are the property of their respective companies.
A GREATER MEASURE OF CONFIDENCE
Keithley Instruments, Inc.
Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 • 1-888-KEITHLEY (534-8453) • www.keithley.com
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