Keithley 7702 User manual

Model 7700, 7702, and 7703 Multiplexer Modules
User’s Guide
PA-695 Rev. C / 8-03
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 PRO-
VIDED 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 LIM-
ITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY
PERSON, OR DAMAGE TO PROPERTY.
Keithley Instruments, Inc. 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: [phone]
1-888-KEITHLEY (534-8453) • www.keithley.com
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5/03

Safety Precautions
The following safety precautions should be observed before using
this product and any associated instrumentation. Although some in-
struments and accessories would normally be used with non-haz-
ardous voltages, there are situations where hazardous conditions
may be present.
This product is intended for use by qualified personnel who recog-
nize shock hazards and are familiar with the safety precautions re-
quired 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 pro-
vided 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 en-
suring 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 instru-
ment. 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 de-
scribed 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 ser-
vice 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 sig-
nals are Measurement Category I and must not be directly connect-
ed 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 other-
wise 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 pre-
vented access and/or insulated from every connection point. In
some cases, connections must be exposed to potential human con-
tact. 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 con-
necting sources to switching cards, install protective devices to lim-
it fault current and voltage to the card.
Before operating an instrument, make sure the line cord is connect-
ed 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 dis-
connect device must be provided, in close proximity to the equip-
ment 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 jump-
ers, 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 com-
mon 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 equip-
ment may be impaired.
Do not exceed the maximum signal levels of the instruments and ac-
cessories, as defined in the specifications and operating informa-
tion, 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 ap-
plied to the device under test. Safe operation requires the use of a
lid interlock.
5/03

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 re-
fer to the operating instructions located in the manual.
The symbol on an instrument shows that it can source or mea-
sure 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 infor-
mation 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 Instru-
ments. 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 se-
lected 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 in-
structions. If the board becomes contaminated and operation is af-
fected, the board should be returned to the factory for proper
cleaning/servicing.
!

Keithley Instruments, Inc.
Cleveland, Ohio 44139
DRN.
CKD.
APP.
DATE
DATE
DATE
PART NUMBER
LTR REVISIONS APP. DATE
FORM 28777A-SBG
BRUNING 40-21 62198-SBG
PURCHASED ITEM
SPECIFICATIONS
HW 10/10/02
Rev. B
GENERAL
20 CHANNELS: 20 channels of 2-pole relay input. All channels config-
urable to 4-pole.
2 CHANNELS: 2 channels of current only input.
RELAY TYPE: Latching electromechanical.
ACTUATION TIME: <3ms.
CAPABILITIES
CHANNELS 1-20: Multiplex one of 20 2-pole or one of 10 4-pole signals
into DMM.
CHANNELS 21-22: Multiplex one of 2 2-pole current signals into DMM.
INPUTS
MAXIMUM SIGNAL LEVEL:
Channels (1-20): 300V DC or 300V rms (42.5V peak) for AC waveforms,
1A switched, 60W, 125VA maximum.
Channels (21-22): 60V DC or 30V rms, 3A switched, 60W, 125VA maxi-
mum.
CONTACT LIFE (typ): >10
5
operations at max signal level.
>10
8
operations cold switching.
CONTACT RESISTANCE: <1Ωat end of contact life.
CONTACT POTENTIAL: <±500nV typical per contact, 1µV max.
<±500nV typical per contact pair, 1µV max.
OFFSET CURRENT: <100pA.
CONNECTOR TYPE: Screw terminal, #20 AWG wire size.
ISOLATION BETWEEN ANY TWO TERMINALS: >10
10
Ω, <100pF.
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >10
9
Ω, <200pF.
CROSS TALK (50ΩLoad):
w/Internal DMM w/o Internal DMM*
10MHz: <–40dB <-40dB
25MHz: ** <-25dB
* Channels 24 and 25 are open. Refer to ROUTe:MULTiple command
in 27xx User’s manual.
** Not valid
INSERTION LOSS (50ΩSource, 50ΩLoad):
w/Internal DMM w/o Internal DMM*
<0.1dB 1MHz 1MHz
<3db 2MHz 50MHz
* Channels 24 and 25 are open. Refer to ROUTe:MULTiple command
in 27xx User’s manual.
COMMON MODEVOLTAGE: 300V or 300V rms (42.5V peak) for AC wave-
forms between any terminal and chassis.
T/C COLD JUNCTION: 1.0°C (18°–28°C Mainframe Temp)
1.5°C (0°–18°C & 28°–50°C Mainframe Temp).
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).
Cold junction
Ref x3
Channel 1 HI
LO
Channel 10 HI
LO
(Channels 2–9)
Channel 11 HI
LO
Channel 20
HI
LO
(Channels 12–19)
Channel 21
HI
LO
Channel 22
HI
LO
AMPS
HI
LO
Sense
HI
LO
Input
Channel 23
2-Pole (Open)
4-Pole (Closed)
(see Note)
3A
3A
To Model 27xx
Backplane
Channel 25
(see Note)
Backplane
isolation
Channel 24
(see Note)
Backplane
isolation
NOTE Channels 23–25 in this schematic
refer to the designations used for
control and not actual available channels.
For more information, refer to the
ROUTe:MULTiple command section
in the Model 2700 User’s Manual.
Channels 24 and 25 can be individually
controlled using ROUTe:MULTiple if the
module is not to be connected to the
internal DMM.
Card AMPS
LO
Card Sense HI
LO
Card Input HI
LO
Cold junction
Ref x3
7700 20-Channel Differential Multiplexer w/Automatic CJC
SPEC-7700
A 23775 Released SZ 11/31/99
B 27663 Revised SZ 9/30/02
SZ
CJM
11/30/99
11/30/99

Rev. A
GENERAL
40 CHANNELS: 40 channels of 2-pole relay input.
All channels configurable to 4-pole.
2 CHANNELS: 2 channels of current only input.
RELAY TYPE: Latching electromechanical.
ACTUATION TIME: <3ms.
CAPABILITIES
CHANNELS 1-40: Multiplex one of 40 2-pole or one of 20 4-pole signals
into DMM.
CHANNELS 41-42: Multiplex one of 2 2-pole current signals into DMM.
INPUTS
MAXIMUM SIGNAL LEVEL:
Channels (1-40): 300V DC or rms, 1A switched, 60W, 125VA maximum.
Channels (41-42): 60V DC or 30V rms, 3A switched, 60W, 125VA maxi-
mum.
CONTACT LIFE (typ): >10
5
operations at max signal level.
>10
8
operations cold switching.
CONTACT RESISTANCE: <1Ωat end of contact life.
CONTACT POTENTIAL: <±500nV typical per contact, 1µV max.
<±500nV typical per contact pair, 1µV max.
OFFSET CURRENT: <100pA.
CONNECTOR TYPE: Screw terminal, #20 AWG wire size.
ISOLATION BETWEEN ANY TWO TERMINALS: >10
10
Ω, <100pF.
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >10
9
Ω, <200pF.
CROSS TALK (10MHz, 50ΩLoad): <–40dB.
INSERTION LOSS (50ΩSource, 50ΩLoad): <0.1dB below 1MHz.
<3dB below 2MHz.
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: 0.5kg (1.1 lb).
Specifications subject to change without notice.
Channel 1 HI
LO
Channel 20 HI
LO
(Channels 2–19)
Channel 21 HI
LO
Channel 40
HI
LO
(Channels 22–39)
Channel 41
HI
LO
Channel 42
HI
LO
AMPS
HI
LO
Sense
HI
LO
Input
Channel 43
2-Pole (Open)
4-Pole (Closed)
(see Note)
3A
3A
To Model 2700
Backplane
Channel 45
(see Note)
Backplane
isolation
Channel 44
(see Note)
Backplane
isolation
NOTE Channels 43–45 in this schematic
refer to the designations used for
control and not actual available channels.
For more information, refer to the
ROUTe:MULTiple command section
in the Model 2700 User’s Manual.
Channels 44 and 45 can be individually
controlled using ROUTe:MULTiple if the
module is not to be connected to the
internal DMM.
Card Sense HI
LO
Card Input HI
LO
7702 40-Channel Differential Multiplexer

Keithley Instruments, Inc.
Cleveland, Ohio 44139
DRN.
CKD.
APP.
DATE
DATE
DATE
PART NUMBER
LTR REVISIONS APP. DATE
FORM 28777A-SBG
BRUNING 40-21 62198-SBG
PURCHASED ITEM
SPECIFICATIONS
Rev. A
GENERAL
32 CHANNELS: 32 channels of 2-pole relay input.
All channels configurable to 4-pole.
RELAY TYPE: Reed.
ACTUATION TIME: <1ms.
CAPABILITIES
CHANNELS 1-32: Multiplex one of 32 2-pole or one of 16 4-pole signals
into DMM.
INPUTS
MAXIMUM SIGNAL LEVEL:
Channels (1-32): 300V DC or rms, 0.5A switched, 10W maximum.
Contact Life (typ): >5×10
4
operations at max signal level.
>10
8
operations cold switching.
CONTACT RESISTANCE: <1Ωat end of contact life.
CONTACT POTENTIAL: <±3µV typical per contact, 6µV max.
<±3µV typical per contact pair, 6µV max.
OFFSET CURRENT: <100pA.
CONNECTOR TYPE: 50 pin D-sub ×2.
RELAY DRIVE CURRENT: 20mA per channel.
ISOLATION BETWEEN ANY TWO TERMINALS: >10
9
Ω, <200pF.
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >10
9
Ω, <400pF.
CROSS TALK (1 MHz, 50ΩLoad): <–40dB.
INSERTION LOSS (50ΩSource, 50ΩLoad): <0.35dB below 1MHz.
<3dB below 2MHz.
COMMON MODE VOLTAGE: 300V between any terminal and chassis.
ENVIRONMENTAL
OPERATING ENVIRONMENT: Specified for 0°C to 50°C.
Specified to 40% R.H. at 35°C.
STORAGE ENVIRONMENT: –25°C to 65°C.
WEIGHT: 0.8kg (1.75 lbs).
Channel 1
HI
LO
Channel 16
HI
LO
(Channels 2–15)
Channel 17
HI
LO
Channel 32
HI
LO
(Channels 18–31)
Backplane
isolation
HI
LO
Sense
Backplane
isolation
HI
LO
Input
Channel 35
2-Pole (Closed)
4-Pole (Open)
(see Note) To Model 2700
Backplane
NOTE Channels 33–35 in this schematic
refer to the designations used for
control and not actual available channels.
For more information, refer to the
ROUTE:MULT command section
in the Model 2700 User’s Manual.
Channel 33
(see Note)
Channel 34
(see Note)
Card Sense HI
LO
Card Input HI
LO
7703 32-Channel High Speed Differential Multiplexer

PA-695 Rev. C / 8-03
Model 7700, 7702, and 7703 Multiplexer Modules
User’s Guide
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
[phone]
Fax: [phone]
www.keithley.com
Introduction
WARNING Connection and wiring procedures contained in this User’s Guide are 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 Models 7700, 7702, and 7703 multiplexer modules. These modules can be
used in the following Model 27xx DMM mainframes:
• 7700 Module – This module can be used in Model 2700, 2701, and 2750 mainframes.
• 7702 Module – This module can be used in Model 2700, 2701, 2750, and 2790 mainframes.
• 7703 Module – This module can be used in Model 2700, 2701, and 2750 mainframes.
All references to the Model 27xx apply to the Models 2700, 2701, and 2750.
If you have any questions after reviewing this information, please contact your local Keithley representative or call our
Applications Engineers at 1-888-KEITHLEY (1-888-543-5483, U.S. only) or Telefax: 440-498-2990 (Instrument Products).
WARNING 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.
Operation
Model 7700 Operation of the Model 7700 module is covered in Section 2 of the Models 2700, 2701, and 2750 User’s
Manuals.
Model 7702 Except for the number of available switching channels and channel number designations, operation of the
Model 7702 is the same as operation for the Model 7700. Model 7700 operation is covered in Section 2 of the
Models 2700, 2701, and 2750 User’s Manuals. Model 7702 operation is also covered in Section 2 of the
Model 2790 Reference Manual and Section 3 of the Model 2790 User’s Manual. Channel number designations
for the Model 7702 is provided in the schematic provided at the beginning of this user’s guide.
Model 770 3 This module is also similar to the Model 7700. Differences include the number of available channels and the
Model 7703 does support amps measurements. Model 7700 operation is covered in Section 2 of the
Models 2700, 2701, and 2750 User’s Manuals. Channel number designations for the Model 7703 are provided
at the end of this User’s Guide.

2
Amps measurements – The 7703 module does not support amps measurements. System channel operation
cannot be used to close channels while an amps function (DCI or ICI) is selected. See the Model 27xx Manual
for details.
• If an amps function (DCI or ACI) is selected and you attempt to close a system channel, the message
“NO AMPS CHAN” will be displayed briefly. For remote programming, error -222 (Parameter data
out of range) is generated.
• If a system channel is already closed and you attempt to select the DCI or ACI function, the message
“INVALID FUNC” will be displayed briefly. For remote programming, error -221 (Settings conflict)
is generated.
Making amps measurements – In order to perform amps measurements, you must use the front panel inputs
of the 27xx mainframe. You can still use the 7703 module for other aspects of the test (such as controlling a
bias supply for DUT), but you must use multiple channel operation to close channels.
Screw terminal access (Model 7700 and 7702)
Turn the access screw to unlock and open the cover. Press in the access screw to lock.
Figure 1
Screw terminal access
Model 7700 – connections and wiring
The Model 7700 is a 20-channel differential multiplexer module with the following features:
• 2-wire or 4-wire Ω measurement (automatically pairs switches for four wire measurements — n + 10)
• Screw terminal connections
• Temperature applications (RTD, thermistor, thermocouple)
• Two protected channels for current measurements (external shunts not required)
• Built-in cold junction reference
• Latching type relays (relays hold their position after power is removed)
• Designed specifically for use with Keithley’s Models 2700, 2701, and 2750 Systems.
U
N
L
O
C
K
LOCK
CH7
H L CH8 H L CH9 H L CH10 H L
H L
CH21 H L CH22
AMPS LO
H L
CH11 H L CH12 H L
CH13 H L
CH14 H L
CH15 H L CH16
H L
CH17 H L CH18 H L CH19 H L
CH20
INPUTSENSE
H
L
H
L CH1
H
L CH2
H
L CH3
H
L CH4
H
L CH5
H
L CH6
H
L
SENSE
(OHMS, 4 WIRE)
INPUT
(V,2 WIRE)

3
Connection information
WARNING 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 7700.
Connections to DMM functions are provided through the card backplane connector.
• Current provided for through two protected channels (Channels 21 and 22).
• INPUT connections.
• SENSE ( Ω 4 Wire) connections.
• AMP and LO common connections to the DMM are also provided.
Figure 2
Model 7700 screw terminal channel designations
CH7
H L CH8 H L CH9 H L CH10 H L
H L
CH21 H L CH22
AMPS LO
H L
CH11 H L CH12 H L
CH13 H L
CH14 H L
CH15 H L CH16
H L
CH17 H L CH18 H L CH19 H L
CH20
INPUT SENSE
H L H L CH1
H L CH2
H L CH3
H L CH4
H L CH5
H L CH6
H L
SENSE
(OHMS, 4 WIRE)
INPUT
(V,2 WIRE)
INPUT
H L SENSE H L CH1 H L CH2 H L CH3 H L CH4 H L CH5 H L CH6 H L CH7 H L CH8 H L CH9 H L CH10 H L
Cable tie holes
Cable tie holes
H L
CH21 H L CH22
AMPS
LO
H L
CH11 H L CH12 H L CH13 H L CH14 H L CH15 H L CH16 H L CH17 H L CH18 H L CH19 H L CH20

4
Wiring procedure
WARNING The information in this section is intended for qualified service personnel. Do not
attempt to perform this procedure unless qualified to do so.
Use the following procedure to wire the Model 7700 module. Make all connections using correct wire size (up to 20 AWG).
Also, make sure to add supplementary insulation around the harness for voltages above 42V peak (see Figure 3).
WARNING All wiring must be rated for the maximum voltage in the system. For example, if 1000V
is applied to the front terminals of the Models 2700, 2701, or 2750, the plug-in module
wiring must be rated for 1000V.
1. Make sure all power is discharged from the Model 7700 module.
2. Access the screw terminals (see “Screw terminal access” located at the front of this document).
3. Using a small flat-blade screwdriver, loosen terminal screws and install wires as desired. (Figure 3 shows connections to
channels 1 and 2).
4. Route wire along wire-path and secure with cable tie as shown.
5. Fill in a copy of the connection log and affix it to the module cover.
6. Close and lock the cover.
Figure 3
Wire dressing — Model 7700
Connection log
Make a copy of Table 1 and affix it to the cover of the Model 7700. Use this to record connection information and channel
descriptions as needed.
Supplementary
Insulation
CH7
H L CH8 H L CH9 H L CH10 H L
H L
CH21 H L CH22
AMPS LO
H L
CH11 H L CH12 H L
CH13 H L
CH14 H L
CH15 H L CH16
H L
CH17 H L CH18 H L CH19 H L
CH20
INPUT SENSE
H L H L CH1
H L CH2
H L CH3
H L CH4
H L CH5
H L CH6
H L
SENSE
(OHMS, 4 WIRE)
INPUT
(V,2 WIRE)
INPUT
(V,2 WIRE)
ENSE
H L CH1
H L CH2
H L CH3
H L CH4
H L C
H
Cable tie

5
Table 1
Connection log Model 7700
Channel Color Description
AMPS COM H
L
INPUT H
L
SENSE H
L
CH1 H
L
CH2 H
L
CH3 H
L
CH4 H
L
CH5 H
L
CH6 H
L
CH7 H
L
CH8 H
L
CH9 H
L
CH10 H
L
CH11 H
L
CH12 H
L
CH13 H
L
CH14 H
L
CH15 H
L
CH16 H
L
CH17 H
L
CH18 H
L
CH19 H
L
CH20 H
L
AMPS21 H
L
AMPS22 H
L

6
Model 7702 – connections and wiring
The Model 7702 is a 40-channel differential multiplexer module with the following features:
• 2-wire or 4-wire Ω measurement (automatically pairs switches for four wire measurements — n + 20)
• Two protected channels for current measurements (external shunts not required)
• Temperature applications (RTD, thermistor, thermocouple)
• Latching type relays (relays hold their position after power is removed)
• Screw terminal connections
• Designed specifically for use with Keithley’s Models 2700, 2701, 2750 or 2790 Systems.
Connection information
WARNING 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 7702.
Connections to DMM functions are provided through the card backplane connector.
• Current provided for through two protected channels (Channels 41 and 42).
• INPUT connections.
• SENSE ( Ω 4 Wire) connections.
• AMP and LO common connections to the DMM are also provided.
Wiring procedure
WARNING The information in this section is intended for qualified service personnel. Do not
attempt to perform this procedure unless qualified to do so.
Use the following procedure to wire the Model 7702 module. Make all connections using correct wire size (up to 20 AWG).
Also, make sure to add supplementary insulation around the harness for voltages above 42V peak (see Figure 5).
WARNING All wiring must be rated for the maximum voltage in the system. For example, if 1000V
is applied to the front terminals of the Models 2700, 2701, 2750, or 2790, the plug-in
module wiring must be rated for 1000V.
1. Make sure all power is discharged from the Model 7702 module.
2. Access the screw terminals (see “Screw terminal access” located at the front of this document).
3. Using a small flat-blade screwdriver, loosen terminal screws and install wires as desired. (Figure 5 shows connections to
the Input and Sense).
4. Route wire along wire-path and secure with cable ties as shown.
5. Fill in a copy of the connection log and affix it to the module cover.
6. Close and lock the cover.

7
Figure 4
Model 7702 Screw terminal channel designations
TE122
TE121
TE122
TE121
CH1
H L
CH2
H L
CH3
H L
CH4
H L CH5
H L
CH6
H L CH7
H L
CH8
H L CH9
H L
CH10
H L CH11
H L
CH12
H L CH13
H L
CH14
H LCH15
H L
CH16
H L CH17
H L
CH18
H L
CH19
H L
CH20
H L
H L
CH21
H L
CH22
H L
CH23
H L
CH24
H L
CH26 H L
CH28 H L
CH32 H L
CH34 H L
CH36 H L
CH38
H L
CH39
H L
CH40
H L
CH41 H L
CH42
INPUT
H L
H L
CH25 H L
CH27 H L
CH29 H L
CH31 H L
CH33
H L
CH35 H L
CH37
SENSE
H L
H L
CH30

8
Figure 5
Wire dressing — Model 7702
Connection log
Make a copy of Table 2 and affix it to the cover of the Model 7702. Use this to record connection information and channel
descriptions as needed.
TE122
TE121
Cable tie
(2 places)
Supplementary
Insulation
T

9
Table 2
Connection log Model 7702
Channel Color Description Description Color Channel
INPUT H
L
SENSE H
L
CH21 HH CH1
LL
CH22 HH CH2
LL
CH23 HH CH3
LL
CH24 HH CH4
LL
CH25 HH CH5
LL
CH26 HH CH6
LL
CH27 HH CH7
LL
CH28 HH CH8
LL
CH29 HH CH9
LL
CH30 HH CH10
LL
CH31 HH CH11
LL
CH32 HH CH12
LL
CH33 HH CH13
LL
CH34 HH CH14
LL
CH35 HH CH15
LL
CH36 HH CH16
LL
CH37 HH CH17
LL
CH38 HH CH18
LL
CH39 HH CH19
LL
CH40 HH CH20
LL
AMPS41 HH AMPS42
LL

10
Model 7703 – connections and wiring
The Model 7703 is a 32-channel high speed differential multiplexer module with the following features:
• 2-wire or 4-wire Ω measurement (automatically pairs switches for four wire measurements — n + 16)
• 50-pin D-Shell connectors (2 × DB50)
• Temperature applications (RTD or thermistor)
• High-speed non-latching reed relays (relays go to open state after power is removed or *RST)
• Designed specifically for use with Keithley’s Models 2700, 2701, and 2750 Systems.
NOTE The 50-pin D-Shell connector mates with Model 7788.
Card configuration—connections
WARNING 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 7703 module.
NOTE When looking at the rear connectors of the Model 7703 module, the connector on the left is P1017
and the connector on the right is P1016.
Figure 6
Rear view—Model 7703 Pinouts (P1016 and P1017)
Make all connections using correct wire size (up to 20 AWG). Also, make sure to add supplementary insulation around the har-
ness for voltages above 42V peak (see Figure 7).
WARNING All wiring must be rated for the maximum voltage in the system. For example, if 1000V
is applied to the front terminals of the Models 2700, 2701, or 2750, the plug-in module
wiring must be rated for 1000V.
Make all connections using correct wire size (up to 20 AWG) (refer to the Model 7788 documentation for specific wiring
instructions).
P1017 P1016
1
17
18
34
50
33
1
17
18
34
50
33

11
CAUTION If both connectors (P1017 and P1016) are not used, install the extra Model 7788 50-pin
D-shell as a plug on the open connector (see Figure 7). If the connector is left open, an
electrical shock hazard may be present.
Figure 7
Supplementary insulation and plugging an unused connector
Table 3
Model 7703 channel designations
P1017 P1016
Pin CH Pin CH Pin CH Pin CH Pin CH Pin CH
18 9 HI 30 15 HI 42 29 HI 1 Sense HI 26 5 HI 38 19 HI
19 9 LO 31 15 LO 43 29 LO 2 Sense LO 27 5 LO 39 19 LO
20 10 HI 32 16 HI 44 30 HI 4 Input HI 28 6 HI 40 20 HI
21 10 LO 33 16 LO 45 30 LO 6 Input LO 29 6 LO 41 20 LO
22 11 HI 34 25 HI 46 31 HI 18 1 HI 30 7 HI 42 21 HI
23 11 LO 35 25 LO 47 31 LO 19 1 LO 31 7 LO 43 21 LO
24 12 HI 36 26 HI 48 32 HI 20 2 HI 32 8 HI 44 22 HI
25 12 LO 37 26 LO 49 32 LO 21 2 LO 33 8 LO 45 22 LO
26 13 HI 38 27 HI 22 3 HI 34 17 HI 46 23 HI
27 13 LO 39 27 LO 23 3 LO 35 17 LO 47 23 LO
28 14 HI 40 28 HI 24 4 HI 36 18 HI 48 24 HI
29 14 LO 41 28 LO 25 4 LO 37 18 LO 49 24 LO
Supplementary
Insulation
Install plug (unused
Model 7788) in
unused connector

12
Connection log
Make a copy of Table 4 and affix it to the cover of the Model 7703. Use this to record connection information and channel
descriptions as needed.
Table 4
Connection log Model 7703
Channel Color Description Description Color Channel
INPUT H
L
SENSE H
L
CH1 HH CH17
LL
CH2 HH CH18
LL
CH3 HH CH19
LL
CH4 HH CH20
LL
CH5 HH CH21
LL
CH6 HH CH22
LL
CH7 HH CH23
LL
CH8 HH CH24
LL
CH9 HH CH25
LL
CH10 HH CH26
LL
CH11 HH CH27
LL
CH12 HH CH28
LL
CH13 HH CH29
LL
CH14 HH CH30
LL
CH15 HH CH31
LL
CH16 HH CH32
LL