Datasheet
TEK.COM 35
DAQ6510 Data Acquisition and Logging, Multimeter System
The 7708 plug-in module offers 40 channels of 2-pole or 20
channels of 4-pole multiplexer switching that can be configured as
two independent banks of multiplexers. The built-in CJC sensors
automatically linearize thermocouples, making the 7708 ideal for
RTD, thermistor, and thermocouple temperature applications.
It is also well suited for mixed-signal measurement applications
that require multi-point monitoring, such as environmental stress
screening.
Key Features
• 40 differential channels for general-purpose measurements
• Two- or four-wire measurements
• 300 V, 1 A capacity for voltage channels; 60 W, 125 VA
• Oversize screw terminal connection blocks are standard for
easier connection
• Relay closures stored in onboard memory
Series 7700 Plug-In Switch Modules
Channel 1
HI
LO
Channel 20
HI
LO
(Channels 2–19)
Channel 21
HI
LO
Channel 40
HI
LO
(Channels 22–39)
HI
LO
Sense
HI
LO
Input
Channel 4
12-Pole (Open)
4-Pole (Closed)
(see Note)
To
Instrument
Backplane
Channel 42
(see Note)
Backplane
isolation
Channel 43
(see Note)
Backplane
isolation
NOTE:
Card Sense
HI
LO
Card Input
HI
LO
Cold Junction
Ref ×4
Cold Junction
Ref ×5
Channels 41 –43 in this schematic refer to
the designations used for control and not
actual available channels.
For more information, refer to the
ROU Te:MULTiple command section in the
Instrument User’s Manual.
Channels 42 and 43 can be individually
controlled using ROUTe:MULTiple if the
module is not to be connected to the
internal DMM.
7708 40-channel, Differential Multiplexer Module
with Automatic CJC and Screw Terminals
Datasheet
Specifications
Capabilities
Channels 1–40 Multiplex one of 40 2-pole or one of 20 4-pole signals
into DMM.
Inputs
Maximum Signal Level
Channels (1–40) 300 V DC or rms, 1 A switched, 60 W, 125 VA
maximum.
Contact Life (typ.) >10
5
operations at max. signal level.
>10
8
operations no load
1
.
1. Open thermocouple detector on during thermocouple measurements. Minimum signal
level 10 mV, 10 μA.
Contact Resistance <2 Ω at end of contact life.
Contact Potential <±500 nV typical per contact, 1 μV max.
<±500 nV typical per contact pair, 1 μV max.
Offset Current <100 pA.
Connector Type Screw terminal, #20 AWG wire size.
Isolation Between Any Two Terminals
>10
9
Ω, <200 pF.
Isolation Between Any Terminal and Earth
>10
9
Ω, <400 pF.
Cross Talk (1 MHz, 50 Ω Load)
<–40 dB.
Insertion Loss (50 Ω Source, 50 Ω Load)
<0.1 dB below 1 MHz. <3 dB below 2 MHz.
Common Mode Voltage
300 V between any terminal and chassis.
General
40 Channels 40 channels of 2-pole relay input. All channels
configurable to 4-pole.
Relay Type Latching electromechanical.
Actuation Time <3 ms.
Environmental Operating Environment: Specified for 0° to 50°C.
Specified to 80% R.H. at 35°C.
Storage Environment: –25° to 65°C.
EMC: Conforms to European Union EMC Directive.
Safety: Conforms to European Union Low Voltage
Directive
RoHS: Conforms to European Union RoHS Directive
Warranty: 1 year
Weight 0.52 kg (1.16 lb).
Supplied Accessories
CC-92-1 Set of 20 Cable Ties
TL-23 Screwdriver
Available Accessories
7708-3Y-EW 1-year factory warranty extended to 3 years from date
of shipment
Ordering Information
7708 40-channel Differential Multiplexer Module with
Automatic CJC and Screw Terminals