Keithley 7708 Datasheet
7708 40-Channel Differential
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 43
2-Pole / 4-Pole
(see Note)
To Model 2700,
2701, or 2750
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, 2701, or 2750 User’s Manual.
Card Sense
HI
LO
Card Input
HI
LO
Cold Junction
Ref XY
Cold Junction
Ref XY
Multiplexer Module
with Automatic CJC and Screw Terminals
40 differential channels for
•
eneral-purpose measurements
g
• Two- or four-wire measurements
• 300V, 1A capacity for voltage
channels; 60W, 125VA
• Oversize screw terminal
connection blocks are standard
for easier connection
• Relay closures stored in onboard
memory
The Model 7708 plug-in module offers 40 channels of 2-pole or 20 channels of 4-pole multi-
Ordering Information
7708 40-Channel Differential
Multiplexer Module with
Automatic CJC and
Screw Terminals
plexer switching that can be configured as two
independent banks of multiplexers. The built-in
CJC sensors automatically linearize thermocouples, making the Model 7708 ideal for RTD, thermistor, and thermocouple temperature applications. It is also well suited for mixed-signal
measurement applications that require multipoint monitoring, such as environmental stress
screening.
ABILITIES
CAP
CHANNELS 1–40: Multiplex one of 40 2-pole or one of 20 4-pole
signals into DMM.
INPUTS
AXIMUM SIGNAL LEVEL:
M
Channels (1–40):
maximum.
CONTACT LIFE (typ): >105operations at max. signal level.
ONTACT RESISTANCE:<1
C
ONTACT POTENTIAL:
C
±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
100pF.
<
SOLATION BETWEEN ANY TERMINAL AND EARTH:>10
I
200pF.
<
ROSS TALK (10MHz, 50
C
INSERTION LOSS (50Ω Source, 50Ω Load): <0.1dB below
1MHz. <3dB below 2MHz.
COMMON MODE VOLTAGE: 300V between any terminal and
chassis.
TEMPERATURE ACCURACY USING INTERNAL CJC: 1.0°C (see
mainframe specification for details).
300V DC or rms, 1A switched, 60W, 125VA
8
10
perations cold switching.
>
o
t end of contact life.
Ω a
1
0
Ω,
9
oad):<–40dB.
Ω L
Ω,
Use with Integra Series Mainframes: 2700, 2701, 2750
DIGITAL MULTIMETERS & SYSTEMS
54
1.888.KEITHLEY
www.keithley.com
(U.S. only)
GENERAL
40 CHANNELS: 40 channels of 2-pole relay input. All channels
configurable to 4-pole.
RELAY TYPE: Latching electromechanical.
ACTUATION TIME: <3ms.
FIRMWARE: Specified for Model 2700 rev. B02, 2701 rev. A01, and
2750 rev. A01 or higher.
ENVIRONMENTAL
OPERATING ENVIRONMENT: Specified for 0°C to 50°C.
STORAGE ENVIRONMENT: –25°C to 65°C.
WEIGHT: 0.52kg (1.16 lb).
ACCESSORIES AVAILABLE
7401 Type K Thermocouple Wire, 30.5m (100 ft).
A GREATER MEASURE OF CONFIDENCE
Specified to 80% R.H. at 35°C.
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