Datasheet

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1.888.KEITHLEY (U.S. only)
A GREATER MEASURE OF CONFIDENCE
Model 7700 Specifications
SWITCH/MEASURE SYSTEMS
24
Integra Series Multimeter/Switch Systems
Modules
7700 20-CHANNEL DIFFERENTIAL MULTIPLEXER
W/AUTOMATIC CJC
FEATURES
• 20 channels for general-purpose measurements, plus two channels to measure
current.
• 2- or 4-wire measurement.
•Oversize screw terminal connection blocks are standard for easier connections.
•Automatic CJC sensors on the scanner card mean there are no other accessories are
required to make thermocouple temperature measurements.
•Configurable as two independent banks of multiplexers.
• 300V, 1A capacity for voltage channels; 60W, 125VA.
• 3A capacity for current channels.
• Relay closures stored in on-board memory.
GENERAL
20 CHANNELS: 20 channels of 2-pole relay input. All channels configurable to 4-pole.
2 CHANNELS: 2 channels of current only input.
RELAY TYPE: Latching electromechanical.
ACTUATION TIME: <3ms.
FIRMWARE: Specified for Model 2700 rev. A01, 2701 rev. A01, and 2750 rev. A01 or
higher.
CAPABILITIES
CHANNELS 1-20: Multiplex one of 20 2-pole or one of 10 4-pole signals into DMM.
CHANNELS 21-22: Multiplex one of 2 2-pole current signals into DMM.
INPUTS
MAXIMUM SIGNAL LEVEL:
Channels (1-20): 300V DC or 300V rms (425V peak) for AC waveforms, 1A
switched, 60W, 125VA maximum.
Channels (21-22): 60V DC or 30V rms, 3A switched, 60W, 125VA maximum.
CONTACT LIFE (typ.): >10
5
operations at max signal level.
>10
8
operations cold switching.
CONTACT RESISTANCE: <1Ω at end of contact life.
CONTACT POTENTIAL: <±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
10
Ω, <100pF.
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >10
9
Ω, <200pF.
INSERTION LOSS (50Ω Source, 50Ω Load):
w/Internal DMM w/o Internal DMM*
<0.1 dB: 1 MHz 1 MHz
<3 dB: 2 MHz 50 MHz
CROSSTALK (50Ω Load): w/Internal DMM w/o Internal DMM*
10 MHz: <–40 dB <–40 dB
25 MHz: ** <–25 dB
COMMON MODE VOLTAGE: 300V or 300V rms (425V peak) for AC waveforms
between any terminal and chassis.
TEMPERATURE ACCURACY USING INTERNAL CJC: 1.0°C (see mainframe specifica-
tion for details).
* Channels 24 and 25 are open. Refer to ROUTe:MULTiple command in 27XX User Manual.
** Not valid.
ENVIRONMENTAL:
OPERATING ENVIRONMENT: Specified for 0°C to 50°C.
Specified to 80% R.H. at 35°C.
STORAGE ENVIRONMENT: –25°C to 65°C.
WEIGHT: 0.45kg (1 lb).
ACCESSORY AVAILABLE: Model 7401 Type K Thermocouple Wire, 30.5m (100 ft).
Cold junction
Ref x3
Channel 1
HI
LO
Channel 10
HI
LO
(Channels 2–9)
Channel 11
HI
LO
Channel 20
HI
LO
(Channels 12–19)
Channel 21
HI
LO
Channel 22
HI
LO
AMPS
HI
LO
Sense
HI
LO
Input
Channel 23
2-Pole (Open)
4-Pole (Closed)
(see Note)
3A
3A
To Model 2700,
2701, or 2750
Backplane
Channel 25
(see Note)
Backplane
isolation
Channel 24
(see Note)
Backplane
isolation
NOTE Channels 23–25 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 Manu
a
Channels 24 and 25 can be individually
controlled using ROUTe:MULTiple if the
module is not to be connected to the
internal DMM.
Card
AMPS
LO
Card Sense
HI
LO
Card Input
HI
LO
Cold junction
Ref x3