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Keithley 7701 User Manual

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Model 7701
User’s Guide
PA-769 Rev. B / 8-03
The Model 7701 can be used with Keithley Models 2700, 2701, and 2750. All references to the Model 27xx apply to the Models 2700, 2701, and 2750.
A GREATER MEASURE OF CONFIDENCE
99 Washington Street Melrose, MA 02176
Phone 781-665-1400 Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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
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
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
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
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 over­voltages. 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.
that hazardous voltage is present in any unknown circuit before measuring.
is the individual or group responsible for the use
use the product for its intended function. They must be
perform routine procedures on the product
are trained to work on live circuits, and perform
A good safety practice is to expect
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,
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.
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.
no conductive part of
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 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
result in personal injury or death. Always read the associated infor­mation very carefully before performing the indicated procedure.
The
CAUTION
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.
heading in a manual explains dangers that might
heading in a manual explains hazards that could
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.
Keithley Instruments, Inc.
28775 Aurora Road Cleveland, Ohio 44139 (440) 248-0400 Fax: (440) 248-6168 www.keithley.com
The information in this section is organized as follows:
• Card configuration – schematic on page 2.
• Connections and wiring on page 4.
• Screw terminals on page 4.
• D-shell connectors on page 6.
• Wiring on page 7.
• Typical connections on page 12.
• Connection log on page 14.
• Operation on page 14.
• Channel assignments on page 15.
• System channel operation on page 15.
• Multiple channel operation on page 16.
• Applications on page 17.
• Service on page 25.
• Performance verification on page 25.
• Replaceable parts on page 25.
• Specifications on page 30.
Model 7701
User’s Guide
PA-769 Rev. B / 8-03

Introduction

NOTE The 7701 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.
The Model 7701 is a 32-channel high speed differential multiplexer module and has the following features:
• Voltage measurements (DC and AC).
• Frequency and period measurements.
• Normal ohms measurements:
• 2-wire ohms to test up to 32 DUT.
• 4-wire ohms to test up to 16 DUT. Normal Ω 4 automatically pairs switches for four wire measurements — n + 16.
• Common-side 4-wire ohms measurements – Configures the module to allow use of a common bus to perform 4-wire ohms measurements on up to 32 DUT.
• Temperature applications (RTD or thermistor).
• 50-pin female D-Shell connector (DB-50) for channels 1 through 24.
• 25-pin female D-Shell connector (DB-25) for channels 25 through 32.
• Screw terminals and supplied jumpers to access the DMM of the Model 27xx mainframe.
WARNING The Model 7701 is configurable to be connected to the internal DMM via the supplied
jumpers and the screw terminals. When connected to the internal DMM, all other modules must be derated to 150VDC or 150Vrms (212V peak) for AC waveforms.
NOTE The Model 7701 is shipped from the factory with the screw terminal jumpers NOT installed. See
“Screw terminals” to install the jumpers.
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.
Card configuration – schematic
Figure 1 shows a simplified schematic diagram of the Model 7701 module. As shown, the Model 7701 has input channels that
are grouped into two banks of sixteen channels (thirty-two channels total). A backplane isolation relay is provided for each bank. The first bank contains channels 1 through 16 while the second bank contains channels 17 through 32. Each input chan­nel of the 32-channel multiplexer card is wired with separate inputs for HI/LO providing fully isolated inputs.
As shown in Figure 1, all Model 7701 channels are isolated from the DMM of the Model 27xx by screw terminals. Supplied jumpers must be installed in the screw terminals to connect switching module channels to the DMM.
For added flexibility, the Model 7701 is equipped with four extra screw terminals. These user-configurable screw terminals are hard-wired to the female DB-25 connector of the switching module. These screw terminals allow external input to bypass the switching module channels.
Although the Model 7701 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 an *RST command is issued.
System channel operation ( ROUT:CLOS command) is used to close measurement channels to connect a DUT to the DMM. With a 2-wire function selected (i.e., DCV), system channels 1 through 32 can be closed. When one of these channels is closed, channel 35 automatically closes to connect the channel to the DMM Input.
2
3
Figure 1
Simplified schematic for Model 7701
P12
External
Wiring Access
P13 P24 P25
Multiplexer 1
Channel 1
(Channels 215)
Channel 16
Channel 17
(Channels 1831)
Channel 32
Multiplexer 2
= Jumper to be installed by user to connect 7701 channels to DMM (Figure 3).
HI
LO
HI
LO
HI
LO
HI
LO
HI
LO
HI
LO
Channel 33
2-Pole (Open)
4-Pole (Closed)
(See Note)
P12 P13
User Configurable
Screw Terminals
P24 P25
Channel 35
(See Note)
Backplane
Isolation
Channel 34
(See Note)
Backplane
Isolation
The Model 7701 is rated for low-voltage applications. When connecting the 7701 to the internal DMM via the screw terminals, all other modules in the mainframe must be derated to 150VDC or 150Vrms (212V peak) for AC waveforms.
Notes: Channels 3335 in this schematic refer to the designations used for
control and not actual available channels. Channels 33, 34, and 35 can be individually controlled using multiple
channel operation (ROUT:MULT commands). For more information, see Section 2 of the Model 27xx Users Manual.
MUX 1
MUX 1
MUX 2
MUX 2
HI
LO
Screw
Terminals
HI
LO
DMM
HI
HI
Input
LO
DMM
LO
To Model
27xx DMM
DMM
SHI
HI
Sense
LO
DMM
SLO
With a normal 4-wire function selected (i.e., Ω 4), system channels 1 through 16 can be closed. These 16 channels are paired to channels 17 through 32 (channel 1 paired to channel 17, channel 2 paired to channel 18, and so on). When one of these system channels is closed, its paired channel, and channels 33 and 34 also close to connect the DUT to the DMM.
With common-side (CSID) 4-wire ohms selected, system channels 1 through 32 can be measured by the DMM. For this ohms mode, the module is to be configured as shown in Figure 12. With CSID ohms selected, channel 33 remains open and channel 35 remains closed. In Figure 12, the bold lines show the signal path to test DUT1.
Dual independent multiplexers
WARNING Multiple channel operation should only be performed by experienced test engineers who
recognize the dangers associated with multiple channel closures.
Multiple channel operation ( ROUT:MULT:CLOS command) allows individual control of switching module channels. Multiple channel operation allows the switching module to be configured as two independent multiplexers. The Model 7701 is normally used as a single 1 × 32 multiplexer, but it can also be configured as two 1 × 16 multiplexers.
In Figure 1, the open position of channel 33 is shown. When channel 33 is closed, Multiplexer 1 (channels 1 through 16) are isolated from Multiplexer 2 (channels 16 through 32).
For the dual multiplexer configuration, only Multiplexer 1 channels can be internally connected to the DMM of the Model 27xx. Closing channel 35 allows channels 1 through 16 to be measured by the DMM.
When using the dual multiplexer configuration, Multiplexer 2 must be isolated from the sense terminals of the DMM. This can be done by keeping channel 34 open, or by not installing the screw terminal jumpers to DMM Sense.

Connections and wiring

WARNING The following information is intended for qualified service personnel. Do not make
switching module connections unless qualified to do so. To prevent electric shock that could result in serious injury or death, adhere to the
following safety precautions:
• Before removing or installing the switching module in the mainframe, make sure the mainframe is turned off and disconnected from line power.
• Before making or breaking connections, make sure power is removed from all external circuitry.
• Do not connect signals that may exceed the maximum specifications of the Model 7701. Specifications are provided at the end of this section.
WARNING The Model 7701 is configurable to be connected to the internal DMM via the supplied
jumpers and the screw terminals. When connected to the internal DMM, all other modules must be derated to 150VDC or 150Vrms (212V peak) for AC waveforms.
Screw terminals
The screw terminals of the Model 7701 are shown in Figure 2. As shown, screw terminals are provided to connect the switch­ing module channels to the DMM. User-configurable screw terminals are also provided to allow external input to bypass the switching module channels.
Four jumpers are supplied with the Model 7701 for use with the screw terminals. As shown in Figure 2, the Model 7701 is shipped with the jumpers not installed. With the jumpers not installed, all input to the Model 7701 is electrically isolated from the DMM.
4
Figure 2
DMM HI
MUX 1 HI
DMM SHI
MUX 2 HI
DMM SLO
MUX 2 LO
DMM LO
MUX 1 LO
P12 P13
P24
P25
Model 7701 screw terminals
5
User-Configurable
Screw Terminals
Screw Terminals to
Connect 7701
Channels to DMM
DMM HI
P12 P13
P24
P25
MUX 1 HI
MUX 2 HI
DMM SHI
DMM SLO
MUX 2 LO
MUX 1 LO
DMM LO
Connecting Model 7701 channels to DMM
Perform the following steps to internally connect the channels of the Model 7701 to the DMM of the Model 27xx:
1. Remove the top cover of the Model 7701. It is secured to the module case by a single screw.
2. Install the four supplied #22 AWG jumpers in the screw terminals as shown in Figure 3. Position the jumpers to allow clear­ance for the top cover and make sure the jumper wires do not come in contact with each other or other electrical conductors.
3. Replace the top cover.
Figure 3
Jumper installation to connect 7701 channels to DMM
DMM HI
A
MUX 1 HI
Jumper A
Jumper B
Jumper C
Jumper D
Connects HI terminals of Multiplexer 1 channels (1 through 16) to DMM Input HI.
Connects HI terminals of Multiplexer 2 channels (17 through 32) to DMM Sense HI.
Connects LO terminals of Multiplexer 2 channels (17 through 32) to DMM Sense LO.
Connects LO terminals of Multiplexer 1 channels (1 through 16) to DMM Input LO.
Jumper (1 of 4)
MUX 2 HI
B
DMM SHI
DMM SLO
C
MUX 2 LO
MUX 1 LO
D
DMM LO
D-shell connectors
Figure 4 shows the pin numbers for the Model 7701 rear panel connectors. The 50-pin D-shell is used to access channels 1
through 24, and Multiplexer 1 terminals. The 25-pin D-shell is used to access channels 25 through 32, and Multiplexer 2 terminals. The user-configurable screw terminals are also accessed at the 25-pin D-shell. Terminal identification for the female connector pins is provided in Table 1.
Figure 4
Rear view – Model 7701 pinouts
50-Pin D-Shell Connector (Female)
17
33
50
1
18
34
25-Pin D-Shell Connector (Female)
13
6
1
1425
Table 1
D-shell pin identification
50-pin D-shell (DB-50)
7701
Pin
Terminal Pin
1 Ch 1 Hi 11 Ch 16 Hi 21 Ch 6 Lo 31 Ch 21 Lo 41 Ch 12 Hi 2 Ch 2 Lo 12 Ch 17 Lo 22 Ch 8 Hi 32 Ch 23 Hi 42 Ch 13 Lo 3 Ch 4 Hi 13 Ch 19 Hi 23 Ch 9 Lo 33 Ch 24 Lo 43 Ch 15 Hi 4 Ch 5 Lo 14 Ch 20 Lo 24 Ch 11 Hi 34 Ch 1 Lo 44 Ch 16 Lo 5 Ch 7 Hi 15 Ch 22 Hi 25 Ch 12 Lo 35 Ch 3 Hi 45 Ch 18 Hi 6 Ch 8 Lo 16 Ch 23 Lo 26 Ch 14 Hi 36 Ch 4 Lo 46 Ch 19 Lo 7 Ch 10 Hi 17 Mux 1 Hi 27 Ch 15 Lo 37 Ch 6 Hi 47 Ch 21 Hi 8 Ch 11 Lo 18 Ch 2 Hi 28 Ch 17 Hi 38 Ch 7 Lo 48 Ch 22 Lo 9 Ch 13 Hi 19 Ch 3 Lo 29 Ch 18 Lo 39 Ch 9 Hi 49 Ch 24 Hi 10 Ch 14 Lo 20 Ch 5 Hi 30 Ch 20 Hi 40 Ch 10 Lo 50 Mux 1 Lo
7701
Pin
Terminal Pin
1 Ch 25 Hi 7 Ch 31 Hi 14 Ch 25 Lo 20 Ch 31 Lo 2 Ch 26 Hi 8 Ch 32 Hi 15 Ch 26 Lo 21 Ch 32 Lo 3 Ch 27 Hi 9 Mux 2 Hi 16 Ch 27 Lo 22 Mux 2 Lo 4 Ch 28 Hi 10, 11 — 17 Ch 28 Lo 23 — 5 Ch 29 Hi 12 P12 18 Ch 29 Lo 24 P24 6 Ch 30 Hi 13 P13 19 Ch 30 Lo 25 P25
7701
Terminal Pin
25-pin D-shell (DB-25)
7701
Terminal Pin
Terminal Pin
Terminal Pin
7701
7701
7701
Terminal Pin
7701
Terminal
7701
Terminal
Wiring
NOTE The Model 7701 is shipped with plastic connector covers installed on the D-shell connectors. Each
cover is secured to the connector by two screws. After removing a connector cover, retain it and the screws for future use. Any unused D-shell connector must have the connector cover installed.
The Model 7701 is supplied with one 50-pin male IDC ribbon cable connector, and one 25-pin male IDC ribbon cable connec­tor. These ribbon cable connectors mate to the D-shell connectors of the switching module.
WARNING When using IDC ribbon cable connections, DO NOT exceed 42V anywhere in the test
system or at the front panel inputs of the Model 27xx. For higher voltage applications, use larger wire (up to #20 AWG) and solder cup D-shell connectors.
There are two connector kits that have connectors that can be used with the Model 7701:
• Model 7790 ribbon cable adapter kit — Contains one female DB-50, one male DB-50 and one male DB-25 IDC ribbon cable connectors. The two male IDC connectors mate to the D-shell connectors on the Model 7701.
• Model 7789 50/25-pin solder cup connector kit — Contains one male DB-50 and one male DB-25 solder cup con­nectors. These connectors mate to the D-shell connectors on the Model 7701.
7
IDC ribbon cable connections
Connect an appropriate length of 50-conductor IDC ribbon cable to a 50-pin male D-shell IDC connector, and connect an appropriate length of 25-conductor IDC ribbon cable to a 25-pin male D-shell IDC connector. Table 2 and Figure 5 provides terminal identification for the 50-pin ribbon cable connections. Table 3 and Figure 6 provides terminal identification for the 25-pin ribbon cable connections.
The connectors of the prepared ribbon cable assemblies mate to the 50- and 25-pin D-shell connectors of the Model 7701 (Figure 7). Make sure an unused D-shell connector has the connector cover installed.
Table 2
Terminal identification for 50-conductor IDC ribbon cable and 7701 DB-50 connector
Ribbon Cable*: 7701 DB-50 Ribbon Cable*: 7701 DB-50
Conductor Color Terminal Pin # Conductor Color Terminal Pin #
1 Brown Ch 1 Hi 1 26 Blue Ch 13 Lo 42 2 Red Ch 1 Lo 34 27 Violet Ch 14 Hi 26 3 Orange Ch 2 Hi 18 28 Grey Ch 14 Lo 10 4 Yellow Ch 2 Lo 2 29 White Ch 15 Hi 43 5 Green Ch 3 Hi 35 30 Black Ch 15 Lo 27 6 Blue Ch 3 Lo 19 31 Brown Ch 16 Hi 11 7 Violet Ch 4 Hi 3 32 Red Ch 16 Lo 44 8 Grey Ch 4 Lo 36 33 Orange Ch 17 Hi 28
9 White Ch 5 Hi 20 34 Yellow Ch 17 Lo 12 10 Black Ch 5 Lo 4 35 Green Ch 18 Hi 45 11 Brown Ch 6 Hi 37 36 Blue Ch 18 Lo 29 12 Red Ch 6 Lo 21 37 Violet Ch 19 Hi 13 13 Orange Ch 7 Hi 5 38 Grey Ch 19 Lo 46 14 Yellow Ch 7 Lo 38 39 White Ch 20 Hi 30 15 Green Ch 8 Hi 22 40 Black Ch 20 Lo 14 16 Blue Ch 8 Lo 6 41 Brown Ch 21 Hi 47 17 Violet Ch 9 Hi 39 42 Red Ch 21 Lo 31 18 Grey Ch 9 Lo 23 43 Orange Ch 22 Hi 15 19 White Ch 10 Hi 7 44 Yellow Ch 22 Lo 48 20 Black Ch 10 Lo 40 45 Green Ch 23 Hi 32 21 Brown Ch 11 Hi 24 46 Blue Ch 23 Lo 16 22 Red Ch 11 Lo 8 47 Violet Ch 24 Hi 49 23 Orange Ch 12 Hi 41 48 Grey Ch 24 Lo 33 24 Yellow Ch 12 Lo 25 49 White Mux 1 Hi 17 25 Green Ch 13 Hi 9 50 Black Mux 1 Lo 50
*50-conductor IDC ribbon cable is available from Keithley, Part #15020.
8
Figure 5
50-conductor ribbon cable terminal identification
50-Pin D-Shell
Male IDC
IDC Ribbon Cable — 50-Conductor
9
1 Brown
3 Orange
5 Green
7 Violet
9 White
11 Brown
13 Orange
15 Green
17 Violet
19 White
21 Brown
23 Orange
25 Green
27 Violet
29 White
31 Brown
33 Orange
35 Green
37 Violet
39 White
41 Brown
43 Orange
45 Green
47 Violet
49 White
2 Red
4 Yellow
6 Blue
8 Grey
10 Black
12 Red
14 Yellow
16 Blue
18 Grey
20 Black
22 Red
24 Yellow
26 Blue
28 Grey
30 Black
32 Red
34 Yellow
36 Blue
38 Grey
40 Black
42 Red
44 Yellow
46 Blue
48 Grey
50 Black
HI
Ch 1
LO HI
Ch 2
LO HI
Ch 3
LO
HI
Ch 4
LO HI
Ch 5
LO
HI
Ch 6
LO
HI
Ch 7
LO
HI
Ch 8
LO HI
Ch 9
LO HI
Ch 10
LO
HI
Ch 11
LO
HI
Ch 12
LO
HI
Ch 13
LO
HI
Ch 14
LO
HI
Ch 15
LO HI
Ch 16
LO
HI
Ch 17
LO
HI
Ch 18
LO HI
Ch 19
LO
HI
Ch 20
LO
HI
Ch 21
LO HI
Ch 22
LO HI
Ch 23
LO HI
Ch 24
LO HI
Multiplexer 1
LO
10
—
—
—
Table 3
Terminal identification for 25-conductor IDC ribbon cable and 7701 DB-25 connector
Ribbon Cable*: 7701 DB-25 Ribbon Cable*: 7701 DB-25
Conductor Color Terminal Pin # Conductor Color Terminal Pin #
1 Brown Ch 25 Hi 1 14 Yellow Ch 31 Lo 20 2 Red Ch 25 Lo 14 15 Green Ch 32 Hi 8 3 Orange Ch 26 Hi 2 16 Blue Ch 32 Lo 21 4 Yellow Ch 26 Lo 15 17 Violet Mux 2 Hi 9 5 Green Ch 27 Hi 3 18 Grey Mux 2 Lo 22 6 Blue Ch 27 Lo 16 19 White — 7 Violet Ch 28 Hi 4 20 Black — 8 Grey Ch 28 Lo 17 21 Brown — 9 White Ch 29 Hi 5 22 Red P24 24 10 Black Ch 29 Lo 18 23 Orange P12 12 11 Brown Ch 30 Hi 6 24 Yellow P25 25 12 Red Ch 30 Lo 19 25 Green P13 13 13 Orange Ch 31 Hi 7
*25-conductor IDC ribbon cable is available from Keithley, Part #15025.
Figure 6
25-conductor ribbon cable terminal identification
25-Pin D-Shell
Male IDC
IDC Ribbon Cable — 25-Conductor
1 Brown
3 Orange
5 Green
7 Violet
9 White
11 Brown
13 Orange
15 Green
17 Violet
19 White
21 Brown
23 Orange
25 Green
2 Red
4 Yellow
6 Blue
8 Grey
10 Black
12 Red
14 Yellow
16 Blue
18 Grey
20 Black
22 Red
24 Yellow
HI
Channel 25
LO HI
Channel 26
LO HI
Channel 27
LO
HI
Channel 28
LO
HI
Channel 29
LO HI
Channel 30
LO HI
Channel 31
LO
HI
Channel 32
LO
HI
Multiplexer 2
LO
P24
P12
P25 P13
Figure 7
Connecting ribbon cable assembly
11
KEITHLEY
CONNECTOR COVER
Warning: When using ribbon cable, DO NOT exceed 42 volts anywhere in the test system or at the front panel inputs of the Model 27xx.
Install plastic cover
over unused connector
using two #4-40 screws.
Solder cup cable connections
Make all connections to D-shell male solder cup connectors using the correct wire size up to 20 AWG. Terminal identification for the 50-pin D-shell connector is provided in Table 1 and Table 2. Terminal identification for the 25-pin D-shell connector is provided in Table 1 and Table 3. Make sure to add supplementary insulation around the harness for voltages above 42V peak (Figure 8).
WARNING All solder cup wiring must be rated for the maximum voltage in the system. For exam-
ple, if 150V is applied to the front terminals of the DMM, All matrix module wiring must be rated for 150V.
A connector cover must be installed on an unused D-shell connector. If the connector is left open, an electrical shock hazard may be present.
Figure 8
Connecting solder cup cable assembly
KEITHLEY
CONNECTOR COVER
Install plastic cover
over unused connector
using two #4-40 screws.
Supplementary
Insulation
Ω
Ω
Typical connections
The following examples show typical wiring connections for the following types of measurements:
• Ω 2-Wire and thermistor connections, Figure 9.
• Ω 4-Wire and RTD connections, Figure 10.
• Voltage connections (AC or DC), Figure 11.
Figure 9
2-Wire and thermistor connections
HI
Column 1
LO
(Columns 2 31)
Resistors or Thermistors
Column 32
Figure 10
4-Wire and RTD connections
Column 1
(Columns 2 15)
Column 16
Column 17
HI
LO
HI
Resistor or
4-Wire RTD
LO
HI
Resistor or
4-Wire RTD
LO
HI
LO
(Columns 18 31)
HI
Column 32
LO
12
Figure 11
Voltage connections (DC or AC)
DC Voltage AC Voltage
13
HI
Column 1
LO
(Columns 2 31)
HI
Column 32
LO
+
+
Connection log
Make a copy of Table 4 and affix it to the cover of the Model 7701. Use this to record connection information and channel descriptions as needed.
Table 4
Connection log Model 7701
Channel Color Description Description Color Channel
MUX 1
MUX 2
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15
CH16
H P12
L P13
H P24
L P25
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
HH
LL
CH17
CH18
CH19
CH20
CH21
CH22
CH23
CH24
CH25
CH26
CH27
CH28
CH29
CH30
CH31
CH32

Operation

Detailed information to close and open switching module channels are provided in Section 2 of the Model 2700 or 2750 User’s Manual. The following summarizes basic operation, and provides operating information specific to the Model 7701.
14
Channel assignments
The Model 2700 has two slots for switching modules and the Model 2750 has five slots. To control the appropriate switching module, the slot number must be included with the switching module channel number when you specify a channel. The chan­nel assignment is formatted as follows:
SCH where: S is the slot number
CH is the channel number
Examples:
101 = Slot 1, Channel 1 210 = Slot 2, Channel 10 506 = Slot 5, Channel 6 (Model 2750)
NOTE For remote operation, the 3-digit channel assignment is included in the channel list parameter for
the commands.
System channel operation
System channel operation is used to connect measurement channels to the Model 27xx DMM. With 2-wire function selected, system channels 1 through 32 can be closed. When one of these channels is closed, channel 35 automatically closes to connect the measurement channel to the DMM Input.
With a 4-wire function selected, system channels 1 through 16 can be closed. When one of these channels is closed, its paired channel closes, and the backplane relays for sense and input (channels 34 and 35) also close.
For a 4-wire function, channels are paired as follows:
CH1 and CH17 CH5 and CH21 CH9 and CH25 CH13 and CH29 CH2 and CH18 CH6 and CH22 CH10 and CH26 CH14 and CH30 CH3 and CH19 CH7 and CH23 CH11 and CH27 CH15 and CH31 CH4 and CH20 CH8 and CH24 CH12 and CH28 CH16 and CH32
System channel operation for the Model 7701 is summarized as follows:
• The
• The CLOSE key can be used to close a system channel. For the Model 2701/2750 and later versions of the Model 2700, use the SINGLE option of the CLOSE key.
• Use the OPEN key to open all channels in the test system. For the Model 2701/2750 and later versions of the Model 2700, use the ALL option of the OPEN key.
• For remote operation, the following commands are used for system channel operation:
/
keys on the Model 27xx DMM can be used to close a system channel.
ROUT:CLOS <clist> ROUT:CLOS? ROUT:CLOS:STAT? <clist> ROUT:OPEN:ALL
Close specified system channel. Returns the closed system channel. Query closed channels in list (1 = closed). Open all channels.
Common-side (CSID) 4-wire ohms
The Model 7701 can be configured to use a common bus to perform 4-wire ohms measurements on up to 32 DUT. Details of CSID operation is provided in the application for Common-side 4-wire ohms measurements on page 17.
15
Amps measurements
The 7701 module does not support amps measurements. System channel operation cannot be used to close channels while an amps function (DCI or ICI) is selected.
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. Example:
SYST:PRES SENS:FUNC ‘CURR:DC’ ROUT:CLOS (@101) ‘ Attempts to close system channel 101 – Generates error -222.
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. Example:
SYST:PRES ROUT:CLOS (@101) ‘ Close system channel 101. SENS:FUNC ‘CURR:DC’
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 7701 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. Example:
NOTE In order to use the front panel inputs, make sure the INPUT switch is in the out (F) position.
SYST:PRES ROUT:MULT:CLOS (@101) ‘ Closes channel 101. SENS:FUNC ‘CURR:DC’
‘ Restores system preset defaults. ‘ Selects DCI function.
‘ Restores system preset defaults.
‘ Attempts to select DCI function – Generates error -221.
‘ Restores system preset defaults.
‘ Selects DCI function – Legal operation.
Multiple channel operation
WARNING Multiple channel operation should only be performed by experienced test engineers who
recognize the dangers associated with multiple channel closures.
Multiple channel operation provides independent control of switching module channels (1 through 35). When you close or open a multiple channel, only the specified channel (or channels) will close or open. Other closed or open channels are not affected.
Multiple channel operation for the Model 7701 is summarized as follows:
• For earlier versions of the Model 2700, multiple channel operation is not available from the front panel (remote operation only).
• For the Model 2701/2750 and later versions of the Model 2700, the MULTI option of the CLOSE key can be used to close a channel.
• For the Model 2701/2750 and later versions of the Model 2700, the MULTI option of the OPEN key can be used to open a channel. The ALL option of the OPEN key opens all channels.
ROUT:MULT:CLOS <clist> ROUT:MULT:OPEN <clist> ROUT:MULT:CLOS? ROUT:MULT:CLOS:STAT? <clist>
You can also use the following command to open all channels:
ROUT:OPEN:ALL
Close specified channels (unlisted channels not affected). Open specified channels (unlisted channels not affected). Returns list of all closed channels. Query closed channels in list (1 = closed).
Open all channels.
16
Applications
Common-side 4-wire ohms measurements
When using 4-wire ohms measurements and system channel operation, up to 16 DUT can be tested by the DMM. By using common-side (CSID) 4-wire ohms mode and the user configurable screw terminals, up to 32 DUT can be measured using 4-wire ohms. Such a test system is shown in Figure 12.
As shown in Figure 12, all 32 DUT are connected to a common metal bus. The bus is connected directly to Input HI and Sense HI of the DMM via the user-configurable screw terminals. The 32 measurement channels can then be used to connect the other side of each DUT to Input LO and Sense LO of the DMM. Jumper installation for this test system is shown in Figure 13.
Figure 12
Common-side 4-wire test system (common-side 4-wire ohms mode)
P12 P13
P24 P25
Input HI
Sense HI
Jumper B
Jumper C
Sense LO
Input LO
Jumper D
Jumper A
HI
Input
LO
DMM
DUT1
DUT16
HI
Ch 1
LO
(Ch 215)
HI
Ch 16
LO
Ch 35
Ch 33
(Open)
DUT17
DUT32
Common-Side
Bus
System channel 1 closed to perform 4-wire CSID ohms measurement on DUTI.
= Signal path to measure DUT1
Note: Installation of the four screw terminal jumpers
(A through D) is shown in Figure 13.
HI
Ch 17
LO
(Ch 1831)
HI
Ch 32
LO
Ch 34
HI
Sense
LO
Equivalent Circuit
HI
Input
LO
DUT
DMM
HI
Sense
LO
17
With the 4-wire common-side ohms mode selected, channels 33 and 35 are automatically controlled as follows when a system
input channel (1 through 32) is closed.
• Channel 33 is forced open to connect Multiplexer 1 (channels 1 through 16) to Multiplexer 2 (channels 17 through 32).
• Channel 35 is forced closed to connect an input channel (1 through 32) to the DMM Input.
Closing input channel 1 also closes channel 35 to connect DUT1 to the DMM input. All other input channels will open (see
Figure 12). Closing channel 2 also closes channel 35 to connect DUT2 to the DMM. Again, all other channels will open. The
other 30 input channels are controlled in a similar manner. Closing an input channel also closes channel 35 to connect the DUT to the DMM. All other channels will open.
Selecting 4-wire ohms mode
There are two 4-wire ohms modes: NORM (normal) and CSID (common-side). For this application use the following procedure to select the CSID mode.
The 4-wire ohms mode can be selected using the following key-press sequence:
1. Press SHIFT and then press CARD.
2. Select CONFIG.
3. Select slot that has the 7701 (i.e., SLOT1: 7701).
4. Select 4W MODE: NORM (normal) or CSID (common-side).
NOTE
Changing the 4-wire ohms mode opens all channels for all modules in the mainframe.
For remote programming, the following commands are valid with a 7701 module installed:
SYSTem:FRESistance:TYPEx, NORMal SYSTem:FRESistance:TYPEx, CSIDe SYSTem:FRESistance:TYPEx? ‘ Query 4W mode.
‘ Select normal 4W mode. ‘ Select common-side 4W mode.
Where the x in TYPEx is the slot number for the 7701 module.
NOTE For the Model 2700, the SYST:FRES:TYPEx command is only supported in units with firmware
revision B03.1 or later. The command is supported for all Model 2701 and 2750 units.
Figure 13
Jumper installation for common-side 4-wire ohms test system
Jumper
Jumper A
Jumper B
Jumper C
Jumper D
(1 of 4)
Connects the DUT common-side bus to DMM Input HI.
Connects the DUT common-side bus to DMM Sense HI.
Connects the DUT to DMM Sense LO through the switching channels.
Connects DUT to DMM Input LO through the switching channels.
A
P12 P13
C
P24
B
P25
DMM HI
MUX 1 HI
MUX 2 HI
DMM SHI
DMM SLO
MUX 2 LO
Note: These screw teminal jumper connections are required for the common-side 4-wire ohms test system shown in Figure 12.
D
18
MUX 1 LO
DMM LO
Test procedure:
NOTE The following test procedure assumes a Model 7701 switching module installed in slot 1 of the
mainframe.
1. Open all channels.
Front panel operation: Press OPEN > Display ALL > Press OPEN Remote programming: ROUT:OPEN:ALL
2. Select Ω4 function.
Front panel operation: Press Ω4 key Remote programming: SENS:FUNC ‘FRES’
3. Select the common-side (CSID) 4-wire ohms mode.
Front panel operation: Press SHIFT > Press CARD > Select CONFIG > Select SLOT1: 7701
> Select 4W MODE: CSID
Remote programming: SYST:FRES:TYPE1 CSID
4. Close channel 1 to test DUT1.
Front panel operation: Press the
key to close the first channel (Ch. 1)
Remote programming: ROUT:CLOS (@101)
5. Measure DUT #1.
Front panel operation: Take reading from display Remote programming: DATA? (for continuous triggering mode)
READ? (for one-shot triggering mode)
6. Close next channel to test DUT.
Front panel operation: Press the key to close the next channel (Ch. 2) Remote programming: ROUT:CLOS (@102)
7. Measure DUT.
Front panel operation: Take reading from display Remote programming: DATA? (for continuous triggering mode)
READ? (for one-shot triggering mode)
8. In general, repeat steps 6 and 7 to test DUT3 through DUT32. That is, close the DUT input channel and take a measurement.
9. After all DUT is tested, repeat step 1 to open all channels.
10. Return the Model 27xx to the normal ohms mode.
Front panel operation: Press SHIFT > Press CARD > Select CONFIG > Select SLOT1: 7701
> Select 4W MODE: NORM
Remote programming: SYST:FRES:TYPE1 NORM
19
Multiple module system
Figure 12 shows a one-card test system to perform common-side ohms measurements on up to 32 DUT. The test system can be
expanded to test more DUT by adding one or more modules:
• Models 2700 and 2701 – Adding a second Model 7701 to the test system allows up to 64 DUT to be tested.
• Model 2750 – Use up to five Model 7701s to test up to 160 DUT.
When adding a Model 7701 module to a common-side ohms test system, you must wire the card properly to minimize path resistance, especially for low-ohms measurements. Figure 14 shows how to properly wire a multiple card system for common­side ohms measurements. This connection scheme will minimize signal path resistance through the backplane connections of the modules.
Notice that for the second module (slot 2), the P12 and P13 terminals are not used. Only the P12 and P13 terminals of the first module are to be connected. It is best to use one common-side bus for all DUT. However, if more than one bus must be used, connect them together using a bus jumper (as shown in Figure 14).
20
Figure 14
Multiple module test system (common-side ohms)
Keithley 27xx Mainframe
Keithley 7701 Switching Module
P12 P13 P24 P25
DUT1
DUT16
DUT17
DUT32
Common-Side
Jumper
DUT33
DUT48
DUT49
DUT64
Common-Side
Bus
Bus
Bus
HI
Ch 1
LO
(Ch 2–15)
HI
Ch 16
LO
Ch 33
(Open)
HI
Ch 17
LO
(Ch 18–31)
HI
Ch 32
LO
Keithley 7701 Switching Module
P12 P13 P24 P25
HI
Ch 1
LO
(Ch 2–15)
HI
Ch 16
LO
Ch 33
(Open)
HI
Ch 17
LO
(Ch 18–31)
HI
Ch 32
LO
Ch 35
Ch 34
Ch 35
Ch 34
Input HI
Sense HI
Sense LO
Input LO
Input HI
Sense HI
Sense LO
Input LO
SLOT 1
SLOT 2
To other
2750 slots
DMM
Input
HI
LO
Sense
HI
LO
27xx
Backplane
21
Biasing and measuring DUT (dual multiplexing)
WARNING Multiple channel operation is required for the following application. Multiple channel
operation should only be performed by experienced test engineers who recognize the dangers associated with multiple channel closures.
This application demonstrates how to use the Model 7701 as a dual multiplexer to bias and measure 16 DUT. An external source powers DUT, while the DMM of the Model 27xx measures the output of the DUT. To prevent overloading of the exter­nal source, each DUT is powered (and measured) separately.
Figure 15 shows the connections for this application. The external source is connected to the Multiplexer 2 terminals of the
switching module, and DUT is connected to channels 1 through 16. Channels 17 through 32 are used to connect external power to each DUT.
For this application, channels 33, 34, and 35 are to be controlled as follows:
• Closing channel 33 isolates the input measurement channels 1 through 16 (Multiplexer 1) from the external source channels 11 through 20 (Multiplexer 2). It also connects the DUT to the external source. This channel must remain closed while testing DUT.
• Opening channel 34 isolates the external source from the backplane of the Model 2750. This channel must remain open while testing DUT.
• Closing channel 35 connects an input channel (1 through 16) to the DMM. This channel must remain closed while testing DUT.
In Figure 15, channels 1 and 17 are closed to test DUT 1. The test for the other DUTs is similar except that different source and measure channels are closed. Closed channels for each DUT test are listed as follows:
Tested Device Closed Channels Tested Device Closed Channels
DUT 1 1, 17, 33, and 35 DUT 9 9, 25, 33, and 35 DUT 2 2, 18, 33, and 35 DUT 10 10, 26, 33, and 35 DUT 3 3, 19, 33, and 35 DUT 11 11, 27, 33, and 35 DUT 4 4, 20, 33, and 35 DUT 12 12, 28, 33, and 35 DUT 5 5, 21, 33, and 35 DUT 13 13, 29, 33, and 35 DUT 6 6, 22, 33, and 35 DUT 14 14, 30, 33, and 35 DUT 7 7, 23, 33, and 35 DUT 15 15, 31, 33, and 35 DUT 8 8, 24, 33, and 35 DUT 16 16, 32, 33, and 35
22
Figure 15
Biasing and measuring DUT test system (multiple channel operation)
External
Source
Multiplexer 1
DUT
(Channels 2–15)
DUT
(Channels 18–31)
HI
LO
HI
Ch 1
LO
HI
Ch 16
LO
HI
Ch 17
LO
HI
Ch 32
LO
HI
Multiplexer 2
LO
Ch 33
(Closed)
Note:
Installation of the four screw terminal jumpers is shown.
Ch 35
Jumper (1 of 4)
Ch 34
Multiple Channel Operation: Open all Channels Close Channel 133 Close Channel 135 Close Channel 101 Close Channel 111
External
DUT
1
HI
Input
LO
DMM
HI
Sense
LO
DMM
Equivalent Circuit
23
Test procedure:
NOTE The following test procedure assumes a Model 7701 switching module installed in slot 1 of the
mainframe. Multiple channel operation from the front panel is not available for early versions of the
Model 2700.
1. Open all channels.
Front panel operation: Press OPEN > Display ALL > Press OPEN Remote programming: ROUT:OPEN:ALL
2. Close channel 33 to isolate measure channels (1 through 16) from source channels (17 through 32).
Front panel operation: Press CLOSE > Select MULTI > Key in 133 > Press ENTER Remote programming: ROUT:MULT:CLOS (@133)
3. Close channel 35 to connect measure channels (1 through 16) to DMM Input.
Front panel operation: Press CLOSE > Select MULTI > Key in 135 > Press ENTER Remote programming: ROUT:MULT:CLOS (@135)
4. Close channel 1 to connect DUT 1 to the DMM.
Front panel operation: Press CLOSE > Select MULTI > Key in 101 > Press ENTER Remote programming: ROUT:MULT:CLOS (@101)
5. Close channel 17 to connect DUT 1 to the external source.
Front panel operation: Press CLOSE > Select MULTI > Key in 117 > Press ENTER Remote programming: ROUT:MULT:CLOS (@117)
6. Measure DUT 1.
Front panel operation: Take reading from display Remote programming: DATA? (for continuous triggering mode)
READ? (for one-shot triggering mode)
7. Open channels 1 and 17 to disconnect the DMM and external source from DUT 1.
Front panel operation: Press OPEN > Select MULTI > Key in 101 > Press ENTER
Press OPEN > Select MULTI > Key in 117 > Press ENTER
Remote programming: ROUT:MULT:OPEN (@101,117)
8. In general, repeat steps 4 through 7 to test DUT 2 through DUT 16. That is, close the channels to connect the DUT to the DMM and external source, take a measurement, and then open the channels to disconnect the DUT from the DMM and external source.
9. After all DUT is tested, repeat step 1 to open all channels.
24

Service

Service for the Model 7701 includes a procedure to verify performance, and provides replaceable parts information.
WARNING All service information is intended only for qualified service personnel. Do not attempt
to service the Model 7701 unless you are qualified to do so.
Performance verification
Use the performance verification procedure for the Model 7701. This procedure is provided in PA-775 of this manual.
Replaceable parts
This section contains replacement parts information and the component layout drawing for the Model 7701.
Parts list
Replaceable parts for the Model 7701 are listed in Table 5.
Ordering information
To place an order, or to obtain information concerning replacement parts, contact your Keithley representative or the factory (see back cover for addresses). When ordering parts, be sure to include the following information:
• Card model number (Model 7701).
• Card serial number.
• Part description.
• Component designation (if applicable).
• Keithley part number.
Factory service
If the instrument is to be returned to Keithley Instruments for repair, perform the following:
• Call the Repair Department at 1-888-KEITHLEY for a Return Material Authorization (RMA) number.
• Carefully pack the instrument in the original packing carton.
• Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label.
Component layout
The component layout for the Model 7701 is provided in Figure 16.
25
Table 5
Model 7701 parts list
Keithley Part
Circuit Designation Description
No.
C1, C3, C4, C9, C10, C11, C14 CAP, .1UF, 20%, 50V, CERAMIC (1206) C-418-.1 C2, C6, C17, C18, C19, C20, C23, C24,
CAP, 47PF, 5%, 100V, CERAMIC (0805) C-465-47P
C25 C5, C98, C99 CAP, 4.7UF, 10%, 35V, TANTALUM C-476-4.7 C16 CAP, 220UF, 20%, 10V, TANTALUM C-558-220 CR1-CR9,CR11-CR18, CR21-CR28,
CR31-CR37 CR41, CR42, CR45, CR48-CR54 DIODE, DUAL SWITCHING, BAV99L
DIODE, DUAL SWITCHING, BAV99L
(SOT-23)
RF-82
RF-82
(SOT-23)
CR43, CR44, CR46, CR47 DIODE, SWITCHING, MMBD914
RF-83
(SOT-23) CR101, CR102, CR103, CR104 DUAL HIGH SPEED DIODE RF-147 J1015 CONN, RT ANGLE DUAL ROW RECEPT CS-1065-1 J1020 CONN, FEMALE, 25-PINS CS-484 J1025 CONN, RT ANGLE 50-PINS CS-1061-1 K1-K32, K41 SINGLE COIL LATCH RELAY RL-225 K42, K43 NON LATCHING RELAY RL-242 Q1-Q4, Q26, Q34, Q36, Q38, Q40, Q42,
TRANS, NPN SILICON TG-389
Q44, Q46
Q5 N-CHANNEL/P-CHANNEL POWER
TG-360
MOSFET Q6, Q7, Q25, Q27, Q29, Q31, Q33,
TRANS, PNP SILICON TG-388
Q35, Q37, Q39 Q41, Q43, Q45, Q47 TRANS, PNP SILICON TG-388 Q48 TRANS, NPN SILICON TG-389 R1 RES, 69.8K, 1%, 1W, THICK FILM R-418-69.8K R2, R3, R5, R6, R108, R109, R110,
R112 R4 RES, 10K, 1%, 100MW, THICK FILM
RES, 1K, 1%, 100MW, THICK FILM
(0805)
R-418-1K
R-418-10K
(0805) R7, R8, R9, R10 RES ARRAY 4X4.3K, 5%, .125W TF-276-4.3K R11, R15, R16, R17, R18, R19 RES, 2.21K, 1%, 1/4W, METAL FILM
R-391-2.21K
(1206) R12, R13 RES, ARRAY 4X1K, 5%, .125W TF-276-1K R14, R55 RES, 49.9, 1%, 1/4W, METAL FILM
R-391-49.9
(1206)
R20 RES, 4.75K, 1%, 100MW, THICK FILM
(0805) TE1, TE2, TE3 CONN, 4-PIN, JOLO BB-125-04 TE-115-4 U1, U2, U3, U6 IC, 8 STAGE SHIFT/STORE, MC14094BD
(SOIC) U14 IC, RETRIG., MULTIVIB, 74HC123AM
(SOIC) U16 IC, 2.5V, CASCADABLE SERIAL
EEPROM U24 IC, QUAD 2 IN AND, 74HCT08 (SOIC) IC-837 U25 IC, HEX SCHMITT INVERT TRIGGER IC-1397
25 D-SHELL MALE 7709-307A
26
R-418-4.75K
IC-772
IC-788
LSI-212
Table 5 (cont.)
Model 7701 parts list
Keithley Part
Circuit Designation Description
No.
4-40 X 1/4 LG. PHIL. FLAT HD. SCREW 4-40X1/4PFH
FOR 7709-312A 4-40 X 1/4 PHILLIPS PAN HD. 4-40X1/4PPH
4-40 X 7/16 STANDOFF ST-166-18 BOTTOM CARD COVER 7703-301B CHIPLOC BAG STATIC SHIELDING PO-13-1 D-SUB CABLE KIT 7709-306A DUAL CONN COVER 7709-312A FINAL INSPECTION 7701-FIN-51 HOLE SIZE 7701-102B MULTIPLEXER 0 U 32 CHANNE JUMPER J-15 MASS TERM BRACKET 7709-303-2A MECHANICAL ASSEMBLY 7701-SCAN-
MECH-3 SCANNER PC BOARD ASSEMBLY 7701-100B SCANNER BOARD SURFACE MOUNT
7701-SCAN-1B
BOTTOM SCANNER BOARD THRU HOLE 7701-SCAN-1H SCANNER BOARD SURFACE MOUNT
7701-SCAN-1T
TOP SERIAL NUMBER LABEL MC-285 SURFACE MOUNT PCB TEST POINT CS-1026 TOP CARD COVER 7703-302C
27
Figure 16
Model 7701 component layout (Side-06)
U24
Q5
C16
+
R20
U14
U25
U2
R7
CR42
CR41
R10
R8
R9
R12
Q43Q45Q47 Q37 Q35 Q33 Q31 Q25
Q29
CR101
CR50
CR49
CR102
CR54
CR51
CR53
CR52
CR103
CR11
K24
CR28
K23
CR27
K22
CR26
K21
CR25
K20
CR24
K19
CR23
K18
CR22 CR21
K17
++ ++ ++ ++ + +++
M 5
U6
U1
C5
+
J 1015
U3
R13
Q40
Q42 Q28 Q30 Q48 Q44 Q38 Q36 Q34 Q32 Q28Q46
Q27
Q41Q39
CR104
CR31
CR46
Q1
CR43
Q2
CR47
U16
CR44
Q7
Q4
CR48
CR45
Q3
Q6
GND_D1
+5VM+5VD
K9
CR12
K10
CR13
K11
CR14
CR15
CR16
K12 K13
**
BAR CODE
XXXXXXXX
K14
CR17
K15 K16
CR18
++
K43 K42 K41
TE3
TE1TE2
K8
CR8
K7
CR7
K6
CR6
K5
CR5
K4
CR4
K3
CR3
K2
CR2 CR1
K1
K25
CR32
K26
CR33
K27
CR34
K28
CR35
K29
CR36
K30
CR37
K31
CR9
K32
+ +++++++++++
MC - 612
J
++++
1025
J
1020
M 1
C98 C99
M 4
Primary Side Components (Side - 06)
Note: For component information, see 7701 Product Structure.
28
+
+
++++
Figure 17
Model 7701 component layout (Side-01)
++++
M6
M2
++++
++ ++ ++ ++ + +++
R16
R55
R15
R14
C23
R11
++
+ +++++++++++
R18
R17
R19
C9
R108
C14
C20
R112
C25
M
R6
3
C10
C11
C19
C18
C17
R2
C24
C2
R4
C6
R3
R110
R109
C1
R5R1
C3
+
C4
Secondary Side Components (Side - 01)
Note: For component information, see 7701 Product Structure.
29
7701 150V 32-Channel Differential Multiplexer
GENERAL
32 CHANNELS: 32 channels of 2-pole relay input. All channels configur-
able to 4-pole.
RELAY TYPE: Latching electromechanical.
ACTUATION TIME: <3ms.
FIRMWARE: Specified for Model 2700 rev. B03 and Model 2750 rev. A01.
DMM CONNECTIONS: Screw terminals provide internal DMM connec-
tions to channels 34 and 35 and connections to external wiring access.
CAPABILITIES
CHANNELS 1–32: Multiplex one of 32 2-pole or one of 16 4-pole signals
into DMM. Configuration supports dual 1×16 independent multi­plexers.
INPUTS
MAXIMUM SIGNAL LEVEL: Any channel to Any Channel (1–32): 150V
DC or 150Vrms (212V peak) for AC waveforms, 1A switched, 60W, 125VA maximum.
SAFETY: Conforms to European Union Directive 73/23/EEC EN61010-1,
CAT I.
CONTACT LIFE (typ): >10
CONTACT RESISTANCE: <1Ω any path and additional 1Ω at end of con-
tact life.
CONTACT POTENTIAL: <6µV per contact pair.
OFFSET CURRENT: <100pA.
CONNECTOR TYPE: 50-pin female D-shell, Channels 1–24.
Supplied with male IDC ribbon cable connectors.
ISOLATION BETWEEN ANY TWO TERMINALS: >10
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >10 CROSS TALK (1MHz, 50ΩLoad): <–35dB. INSERTION LOSS (50ΩSource, 50Ω Load): <0.35dB below 1MHz.
COMMON MODE VOLTAGE: 300VDC or 300Vrms (425V peak) for AC
waveforms between any terminal and chassis.
5
operations at max signal level.
8
operations cold switching.
>10
25-pin female D-shell, Channels 25–32.
9
Ω, <200pF.
9
Ω, <400pF.
<3dB below 2MHz.
External Wiring Access
Multiplexer 1
Channel 1
(Channels 2–15)
Channel 16
Channel 17
(Channels 18–31)
Channel 32
Multiplexer 2
HI
LO
HI
LO
HI
LO
Channel 33 2-Pole (Open) 4-Pole (Closed)
(see Note)
HI
LO
HI
LO
HI
LO
User Configurable Screw Terminals
Channel 35
(see Note)
Backplane Isolation
Channel 34
(see Note)
Backplane Isolation
The Model 7701 is rated for low-voltage applications. When connecting the 7701 to the internal DMM via the screw terminals, all other modules in the mainframe must be derated to 150VDC or 150Vrms (212V peak) for AC waveforms.
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 or 2750 User’s Manual.
HI
LO
HI
LO
Screw
Terminals
Screw
Terminals
HI DMM Input LO
HI DMM Sense LO
To Internal DMM
ENVIRONMENTAL:
OPERATING ENVIRONMENT: Specified for 0°C to 50°C.
Specified to 50% R.H. at 35°C.
STORAGE ENVIRONMENT: –25°C to 65°C.
WEIGHT: <0.52kg (1.16 lb).
ACCESSORIES AVAILABLE:
Model 7789 50/25 Pin Male D-Shell Solder Cup Connectors Model 7790 50/50/25 Pin Female/Male D-Shell IDC Connectors
4/30/01
Rev. B
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.
Keithley Instruments, Inc. 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168
1-888-KEITHLEY (534-8453) • www.keithley.com
Sales Offices: BELGIUM:
Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02-363 00 40 • Fax: 02/363 00 64
CHINA: Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-8225-1886 • Fax: 8610-8225-1892 FINLAND:
Tietäjäntie 2 • 02130 Espoo • Phone: 09-54 75 08 10 • Fax: 09-25 10 51 00
FRANCE: 3, allée des Garays • 91127 Palaiseau Cédex • 01-64 53 20 20 • Fax: 01-60 11 77 26 GERMANY: Landsberger Strasse 65 • 82110 Germering • 089/84 93 07-40 • Fax: 089/84 93 07-34 GREAT BRITAIN: Unit 2 Commerce Park, Brunel Road • Theale • Berkshire RG7 4AB • 0118 929 7500 • Fax: 0118 929 7519 INDIA: 1/5 Eagles Street • Langford Town • Bangalore 560 025 • 080 212 8027 • Fax: 080 212 8005 ITALY: Viale San Gimignano, 38 • 20146 Milano • 02-48 39 16 01 • Fax: 02-48 30 22 74 JAPAN:
New Pier Takeshiba North Tower 13F • 11-1, Kaigan 1-chome • Minato-ku, Tokyo 105-0022 • 81-3-5733-7555 • Fax: 81-3-5733-7556
KOREA:
2FL., URI Building • 2-14 Yangjae-Dong • Seocho-Gu, Seoul 137-888 • 82-2-574-7778 • Fax: 82-2-574-7838
NETHERLANDS: Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: 0183-630821 SWEDEN: c/o Regus Business Centre • Frosundaviks Allé 15, 4tr • 169 70 Solna • 08-509 04 600 • Fax: 08-655 26 10 TAIWAN: 13F-3. No. 6, Lane 99 Pu-Ding Road • Hsinchu, Taiwan, R.O.C. • 886-3-572-9077• Fax: 886-3-572-9031
© Copyright 2003 Keithley Instruments, Inc.
Printed in the U.S.A.
1/03
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