Tektronix KEITHLEY 7701 User manual

Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595
tek.com/keithley
Model 7701 Multiplexer Module
Instructions for use with DAQ6510
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Introduction
The 7701 32-Channel High-Speed Differential Multiplexer Module offers 32 channels of 2-pole or 16 channels
of 4-pole multiplexer switching. Its 32 channels can be configured for commonside 4-wire ohms measurements.
The channels can also be configured as two independent banks of multiplexers. The 7701 is ideal for RTD or
thermistor temperature applications.
Figure 1: 7701 32-Channel Differential Multiplexer Module
Item shipped may vary from model pictured here.
The 7701 includes the following features:
▪Configurable for 32 channels of differential measurements, with up to 16 channels of 4-pole
measurements
▪Two female D-shell connectors are standard for secure hook-up and quick teardown
▪150 V, 1 A capacity for voltage channels; 60 W, 125 VA
▪Relay closures stored in onboard memory
▪Screw terminal jumpers allow user-configurable DMM connections
The 7701 can be used with the DAQ6510 Data Acquisition and Multimeter System.
If you are using this switching module with the 2700, 2701, or 2750, please see Model 7701 User's
Guide, Keithley Instruments document number PA-769.

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Connections and wiring
Connection and wiring procedures in this document are intended for use by qualified
personnel only, as described by the types of product users in the Safety precautions (on
page 25). 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.
Do not connect signals that may exceed the maximum specifications for the 7701. Refer to
the specifications provided in the data sheet. Failure to recognize and observe normal safety
precautions could result in personal injury or death.
The 7701 can be configured to be connected to the internal DMM of the instrument using the
supplied jumpers and the screw terminals. When connected to the internal DMM, all other
modules must be derated to 150 VDC or 150 VRMS (212 VPEAK) for AC waveforms. Failure to
recognize and observe normal safety precautions could result in personal injury or death.
Screw terminals
The screw terminals of the 7701 are shown in the following figure. Screw terminals are provided to connect the
switching module channels to the instrument. User-configurable screw terminals allow the external input to
bypass the switching module channels.
Four jumpers are supplied with the 7701 for use with the screw terminals. As shipped, the jumpers are not
installed in the 7701, as shown in the following figure. When the jumpers are not installed, all input to the 7701
is electrically isolated from the DMM.
Equipment needed:
▪Flat-blade screwdriver
▪Cable ties
To make connections to the 7701:
1. Make sure all power is discharged from the 7701 module.
2. Using a screwdriver, turn the access screw to unlock and open the cover.
3. Using the flat-blade screwdriver, loosen the terminal screws and install the wires as needed. The channel
designations for the screw terminals are shown in the following figures.

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Figure 2: 7701 screw terminals

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4. Install the four supplied #22 AWG jumpers in the screw terminals as shown in the following figure. Position
the jumpers to allow clearance for the top cover. Make sure the jumper wires do not contact each other or
other electrical conductors.
▪Jumper A: Connects the HI terminals of the multiplexer 1 channels (1 to 16) to the DMM Input HI.
▪Jumper B: Connects the HI terminals of the multiplexer 2 channels (17 to 32) to the DMM Sense HI.
▪Jumper C: Connects the LO terminals of the multiplexer 2 channels (17 to 32) to the DMM Sense LO.
▪Jumper D: Connects the LO terminals of the multiplexer 1 channels (1 to 16) to the DMM Input LO.
Figure 3: Jumper installation to connect 7701 channels to DMM
5. Use a flat-blade screwdriver to replace the top cover.
D-sub connectors
The following figure shows the pin numbers for the 7701 rear-panel connectors. The 50-pin D-sub is used to
access channels 1 to 24 and Multiplexer 1 terminals. The 25-pin D-sub is used to access channels 25 to 32 and
Multiplexer 2 terminals. The user-configurable screw terminals are also accessed at the 25-pin D-sub. Terminal
identification for the socket connector pins is provided in the following tables.
Figure 4: 7701 pinouts –rear view

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50-pin D-sub connector
Pin
7701
Terminal
Pin
7701
Terminal
Pin
7701
Terminal
Pin
7701
Terminal
Pin
7701
Terminal
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

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25-pin D-sub connector
Pin
7701
Terminal
Pin
7701
Terminal
Pin
7701
Terminal
Pin
7701
Terminal
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
Not connected
17
Ch 28 Lo
23
Not connected
5
Ch 29 Hi
12
P12
18
Ch 29 Lo
24
P24
6
Ch 30 Hi
13
P13
19
Ch 30 Lo
25
P25
Wiring
You must install a connector cover on an unused D-sub connector. If the connector is left
open, an electrical shock hazard may be present. Failure to recognize and observe normal
safety precautions could result in personal injury or death.
The 7701 is supplied with one 50-pin IDC ribbon cable connector and one 25-pin IDC ribbon cable connector.
These ribbon cable connectors connect to the D-sub connectors of the switching module.
When using IDC ribbon cable connections, do not exceed 42 V anywhere in the test system or
at the front-panel inputs of the DAQ6510. For higher voltage applications, use larger wire (up
to #20 AWG) and solder cup D-sub connectors. Failure to recognize and observe normal
safety precautions could result in personal injury or death.
There are two connector kits that have connectors that can be used with the Model 7701:
▪Model 7790 ribbon cable adapter kit: Contains one DB-50 socket, one DB-50 plug, and one DB-25
ribbon cable plug.
▪Model 7789 50/25-pin solder cup connector kit: Contains one DB-50 connector and one DB-25 solder
cup connector.

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IDC ribbon cable connections
Connect an appropriate length of 50-conductor IDC ribbon cable to a 50-pin plug D-sub IDC connector, and
connect an appropriate length of 25-conductor IDC ribbon cable to a 25-pin plug D-sub IDC connector. The
following table and figure provide terminal identification for the 50-pin ribbon cable connections.
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
Gray
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
Gray
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
Gray
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
Gray
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
Gray
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 Instruments. Reference part #15020. You
need a 50-conductor flat ribbon cable with 26 AWG wire on 0.050-inch centers rated at 50 V or greater.

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The following table and figure provide terminal identification for the 25-pin ribbon cable connections.
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
Gray
MUX 2 Lo
22
6
Blue
Ch 27 Lo
16
19
White
Not connected
10
7
Violet
Ch 28 Hi
4
20
Black
Not connected
23
8
Gray
Ch 28 Lo
17
21
Brown
Not connected
11
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 Instruments. Reference part #15025. You need a
25-conductor flat ribbon cable with 28 AWG wire on 0.050-inch centers at 50 V or greater.
The connectors of the prepared ribbon cable assemblies mate to the 50- and 25-pin D-sub connectors of the
7701. If a D-sub connector is unused, make sure the connector cover installed. See the following figure.
Figure 5: Connecting ribbon cable assembly

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7789 Solder Cup Adapter Kit cable connections
Make all connections to D-sub plug solder cup connectors using the correct wire size up to 20 AWG. Terminal
identification for the 50-pin D-sub connector and the 25-pin D-sub connector is provided in the tables in IDC
ribbon cable connections (on page 7). Add supplementary insulation around the harness for voltages above 42
VPEAK, as shown in the following figure.
If a D-sub connector is unused, make sure the connector cover is installed as shown in the following figure.
All solder cup wiring must be rated for the maximum voltage in the system. For example, if
150 V is applied to the front terminals of the instrument, all matrix module wiring must be
rated for 150 V. Failure to recognize and observe normal safety precautions could result in
personal injury or death.
Figure 6: Connecting solder cup cable assembly

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Typical connections
The following examples show typical wiring connections for the following types of measurements:
▪Two-wire resistance and thermistor
▪Four-wire resistance and RTD
▪DC or AC voltage
Figure 7: 2-wire resistance and thermistor connections
Figure 8: 4-wire resistance and RTD connections

Model 7701 Multiplexer Module Instructions for use with DAQ6510
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Figure 9: Voltage connections - DC or AC
Connection log
You can use the next table to record your connection information.

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Connection log for the 7701
Channel
Color
Description
Description
Color
Channel
MUX 1
H
P12
L
P13
MUX 2
H
P24
L
P25
CH1
H
H
CH17
L
L
CH2
H
H
CH18
L
L
CH3
H
H
CH19
L
L
CH4
H
H
CH20
L
L
CH5
H
H
CH21
L
L
CH6
H
H
CH22
L
L
CH7
H
H
CH23
L
L
CH8
H
H
CH24
L
L
CH9
H
H
CH25
L
L
CH10
H
H
CH26
L
L
CH11
H
H
CH27
L
L
CH12
H
H
CH28
L
L
CH13
H
H
CH29
L
L
CH14
H
H
CH30
L
L
CH15
H
H
CH31
L
L
CH16
H
H
CH32
L
L

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Installation
Before operating an instrument with a switching module, verify that the switching module 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.
If you are installing two switching modules, it is easier to install one switching module into slot 2 first, then install
the second switching module into slot 1.
If you have a Keithley Instruments Model 2700, 2701, or 2750 instrument, you can use your existing
switching module in the DAQ6510. Follow the instructions in your original equipment documentation
to remove the module from the instrument, then use the following instructions to install it in the
DAQ6510. You do not need to remove wiring to the module.
For inexperienced users, it is recommended that you do not connect a device under test (DUT) and
external circuitry to the switching module. This allows you to exercise close and open operations
without the dangers associated with live test circuits. You can also set up pseudocards to experiment
with switching. Refer to "Pseudocards" in the Model DAQ6510 Data Acquisition and Multimeter
System Reference Manual for information on setting up pseudocards.
To prevent electric shock that could result in injury or death, never handle a switching
module that has power applied to it. Before installing or removing a switching module, make
sure the DAQ6510 is turned off and disconnected from line power. If the switching module is
connected to a DUT, make sure power is removed from all external circuitry.
If a card slot is unused, you must install slot covers to prevent personal contact with high
voltage circuits. Failure to install slot covers could result in personal exposure to hazardous
voltages, which could cause personal injury or death if contacted.
Before installing or removing a switching module, make sure the DAQ6510 power is turned
off and disconnected from line power. Failure to comply may result in incorrect operation and
loss of data in the memory.
Required equipment:
▪Medium flat-blade screwdriver
▪Medium Phillips screwdriver

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To install a switching module into the DAQ6510:
1. Turn off the DAQ6510.
2. Disconnect the power cord from the power source.
3. Disconnect the power cord and any other cables that are connected to the rear panel.
4. Position the DAQ6510 so you are facing the rear panel.
5. Use the screwdriver to remove the slot cover screws and the cover plate. Retain the plate and screws for
future use.
6. With the top cover of the switching module facing up, slide the switching module into the slot.
7. Press the switching module in firmly to make sure the switching module connector is connected to the
DAQ6510 connector.
8. Use the screwdriver to tighten the two mounting screws to secure the switching module to the mainframe.
Do not overtighten.
9. Reconnect the power cord and any other cables.
Remove a switching module
Before you remove a switching module or begin any testing, make sure that all the relays are open.
Since some relays may be latched closed, you must open all the relays before removing the
switching module to make connections. Additionally, if you drop your switching module, it is possible
for some relays to latch closed.
To open all channel relays, go to the CHANNEL swipe screen. Select Open All.
To prevent electric shock that could result in injury or death, never handle a switching
module that has power applied to it. Before installing or removing a switching module, make
sure the DAQ6510 is turned off and disconnected from line power. If the switching module is
connected to a DUT, make sure power is removed from all external circuitry.
If a card slot is unused, you must install slot covers to prevent personal contact with high
voltage circuits. Failure to install slot covers could result in personal exposure to hazardous
voltages, which could cause personal injury or death if contacted.

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Before installing or removing a switching module, make sure the DAQ6510 power is turned
off and disconnected from line power. Failure to comply may result in incorrect operation and
loss of data in the memory.
Required equipment:
▪Medium flat-blade screwdriver
▪Medium Phillips screwdriver
To remove a switching module from the DAQ6510:
1. Turn off the DAQ6510.
2. Disconnect the power cord from the power source.
3. Disconnect the power cord and any other cables that are connected to the rear panel.
4. Position the DAQ6510 so you are facing the rear panel.
5. Use the screwdriver to loosen the mounting screws that secure the switching module to the instrument.
6. Carefully remove the switching module.
7. Install a slot plate or another switching module in the empty slot.
8. Reconnect the power cord and any other cables.
Operation
Refer to the instrument documentation for operating instructions.
This switching module does not support current measurements. If the instrument has the TERMINALS switch
set to REAR and you are working with the slot that contains this switching module, the AC, DC, and digitize
current functions are not available. You can measure current using the front panel or using another slot that
contains a switching module that supports the AC, DC, and digitize current measurements.
If you use remote commands to attempt to measure current when configuring a channel, an error is returned.

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Module configuration schematic
The following figure shows a simplified schematic diagram of the 7701 module. The 7701 has input channels
that are grouped into two banks of 16 channels (32 channels total). A backplane isolation relay is provided for
each bank. The first bank contains channels 1 to 16 while the second bank contains channels 17 to 32. Each
input channel of the 32-channel multiplexer module is wired with separate inputs for HI/LO, providing fully
isolated inputs.
As shown in the following figure, all 7701 channels are isolated from the DMM of the DAQ6510 by screw
terminals. To connect the switching module channels to the DMM, you must install the supplied jumpers, as
described in Screw terminals (on page 2).
For added flexibility, the 7701 is equipped with four extra screw terminals. These user-configurable screw
terminals are hard-wired to the DB-25 socket connector of the switching module. These screw terminals allow
you to use an external input to bypass the switching module channels.
Although the 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 a reset command is issued.
With a 2-wire function selected (such as DCV), channels 1 to 32 can be closed. When one of these channels is
closed, channel 35 automatically closes to connect the channel to the DMM Input.
With a normal 4-wire function selected (such as 4-wire resistance), channels 1 to 16 can be closed. These 16
channels are paired to channels 17 to 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.

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Figure 10: 7701 simplified schematic
The 7701 is rated for low-voltage applications. When connecting the 7701 to the internal DMM using
the screw terminals, all other modules in the mainframe must be derated to 150 VDC or 150 VRMS
(212 VPEAK) for AC waveforms.
Channels 33 to 35 in this schematic refer to designations used for control and are not available
channels.

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Channels 33, 34, and 35 can be individually controlled. For more information, refer to "Multiple
channel operation" in the instrument reference manual.
Applications
The following applications use multiple channel operation, where each channel is controlled
independently. Multiple channel operation should only be performed by experienced test
engineers who recognize the dangers associated with multiple channel closures. Failure to
recognize and observe normal safety precautions could result in personal injury or death.
Refer to "Multiple channel operation" in the instrument reference manual for additional information.
Commonside 4-wire resistance measurements
When using 4-wire resistance measurements and normal channel operation, the instrument can test up to 16
DUTs. By using multiple channel operation and the user-configurable screw terminals, the instrument can test
up to 32 DUTs using 4-wire resistance. An example of this test system is shown in the figure following the table.
All 32 DUTs are connected to a common metal bus. The bus is connected directly to Input HI and Sense HI of
the DMM through the user-configurable screw terminals. The 32 measurement channels can be used to
connect the other side of each DUT to Input LO and Sense LO of the DMM.
For this application, control channels 33 and 35 as follows:
▪Opening channel 33 connects Multiplexer 1 (channels 1 to 16) to Multiplexer 2 (channels 17 to 32).
Channel 33 must remain open for all DUT tests.
▪Closing channel 35 connects a measurement channel (1 to 32) to the DMM Input. Channel 35 must
remain closed for all DUT tests.
In the figure following the table, channels 1 and 35 are closed to test DUT 1. The tests for the other DUTs are
similar except that different measurement channels are closed, as shown in the following table.
Tested
Device
Closed
Channels
Tested
Device
Closed
Channels
Tested
Device
Closed
Channels
Tested
Device
Closed
Channels
DUT 1
1 and 35
DUT 9
9 and 35
DUT 17
17 and 35
DUT 25
25 and 35
DUT 2
2 and 35
DUT 10
10 and 35
DUT 18
18 and 35
DUT 26
26 and 35
DUT 3
3 and 35
DUT 11
11 and 35
DUT 19
19 and 35
DUT 27
27 and 35
DUT 4
4 and 35
DUT 12
12 and 35
DUT 20
20 and 35
DUT 28
28 and 35
DUT 5
5 and 35
DUT 13
13 and 35
DUT 21
21 and 35
DUT 29
29 and 35
DUT 6
6 and 35
DUT 14
14 and 35
DUT 22
22 and 35
DUT 30
30 and 35
DUT 7
7 and 35
DUT 15
15 and 35
DUT 23
23 and 35
DUT 31
31 and 35
DUT 8
8 and 35
DUT 16
16 and 35
DUT 24
24 and 35
DUT 32
32 and 35
In the figure below, the bold lines show the signal path to test DUT 1.

Model 7701 Multiplexer Module Instructions for use with DAQ6510
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Figure 11: Commonside 4-wire test system (multiple-channel operation)

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Jumper installation for 4-wire commonside ohms application
Jumper installation for the commonside 4-wire resistance test system is shown in the following figure.
In the following figure:
▪Jumper A: Connects the DUT commonside bus (P12) to DMM Input HI.
▪Jumper B: Connects the DUT commonside bus (P13) to DMM Sense HI.
▪Jumper C: Connects the DUT to DMM Sense LO through the switching channels.
▪Jumper D: Connects the DUT to DMM Input LO through the switching channels.
Figure 12: Jumper installation for commonside 4-wire resistance test system
Test setup
On the front panel of the DAQ6510, set TERMINALS to REAR for this test.
Test procedure
You must run this application using remote commands with the switching module in slot 1.
The following example shows how to remotely configure for commonside ohms, then sequentially make
measurements on DUTs 1 to 32 (as shown in the figure above). Repeat these steps for the channel
sequentially for each DUT (2 to 32). The example then demonstrates how to returns the data from the reading
buffer and open all channels.
Using SCPI commands
ROUTe:OPEN:ALL
SENSe:FUNCtion "FRESistance", (@101:132)
ROUTe:CSOhms (@slot1), ON
ROUTe:CLOSe (@101)
READ?
Repeat closing and reading channels for each DUT (channels 102 to 131).
ROUTe:CLOSe (@132)
READ?
TRACe:DATA? 1, 32, "defbuffer1"
ROUTe:OPEN:ALL