Tektronix 7701 User manual
Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595
tek.com/keithley
Model 7701 Multiplexer Module
*P077144700* 1
Instructions for use with DAQ6510
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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Model 7701 Multiplexer Module Instructions for use with DAQ6510
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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 V
recognize and observe normal safety precautions could result in personal injury or death.
Screw terminals
RMS
(212 V
) for AC waveforms. Failure to
PEAK
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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Model 7701 Multiplexer Module Instructions for use with DAQ6510
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Figure 2: 7701 screw terminals
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Model 7701 Multiplexer Module Instructions for use with DAQ6510
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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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Model 7701 Multiplexer Module Instructions for use with DAQ6510
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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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Model 7701 Multiplexer Module Instructions for use with DAQ6510
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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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Model 7701 Multiplexer Module Instructions for use with DAQ6510
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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.
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
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Model 7701 Multiplexer Module Instructions for use with DAQ6510
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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 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
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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