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 Manual.
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
L
O
Cold junction
Ref x3
7700 20-Channel, Differential
Multiplexer Module
with Automatic CJC, Screw Terminals, and up to 50MHz Bandwidth
20 channels for general-purpose
•
easurements, plus two
m
channels to measure current
• Oversize screw terminal
connection blocks are standard
or easier connections
f
• 50MHz bandwidth
• 300V, 1A capacity for voltage
channels; 60W, 125VA
• 3A capacity for current channels
• Low insertion loss of up to
50MHz
• Relay closures stored in onboard
memory
Ordering Information
7700 20-Ch, Diff Mux Module
w/Automatic CJC and
Screw Terminals
The Model 7700 plug-in module offers 20 channels of 2-pole or 10 channels of 4-pole multi
plexer switching that can be configured as two
independent banks of multiplexers. There are
two additional protected channels for current
measurements. Automatic CJC is provided so
that no other accessories are required to make
thermocouple temperature measurements. In
addition, the Model 7700 contains latching
electromechanical relays that enable signal bandwidths of up to 50MHz. The Model 7700 is ideal
for RTD, thermistor, and thermocouple
temperature applications.
ABILITIES
CAP
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
MM.
D
INPUTS
MAXIMUM SIGNAL LEVEL:
Channels (1-20):
aveforms, 1A switched, 60W, 125VA maximum.
w
hannels (21-22):60V DC or 30V rms, 3A switched, 60W,
C
25VA maximum.
1
ONTACT LIFE (typ.):>10
C
-
CONTACT RESISTANCE: <1Ω at end of contact life.
CONTACT POTENTIAL: <±500nV typical per contact, 1µV max.
300V DC or 300V rms (425V peak) for AC
5
perations at max signal level.
o
8
>10
operations cold switching.
<±500nV typical per contact pair,
µV max.
1
OFFSET CURRENT: <100pA.
ONNECTOR TYPE:Screw terminal, #20 AWG wire size.
C
SOLATION BETWEEN ANY TWO TERMINALS:>10
I
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >109Ω,
<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 specification for details).
* Channels 24 and 25 are open. Refer to ROUTe:MULTiple command in
27XX User Manual.
** Not valid.
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.
ARE:
FIRMW
2750 rev. A01 or higher.
ENVIRONMENT
TING ENVIRONMENT
A
OPER
AGE ENVIRONMENT
STOR
WEIGHT:0.45kg (1 lb).
ACCES
SORY AVAILABLE:
ire, 30.5m (100 ft).
W
ed for Model 2700 rev
Specifi
AL
:
ed for 0
Specifi
Specified to 80% R.H. at 35°C.
:
C to 65
°
–25
Model 7401 T
ype K Thermocouple
10
<100pF.
Ω,
. A01, 2701 rev. A01, and
C.
°
C to 50
°
C.
°
Use with Integra Series Mainframes: 2700, 2701, 2750
1.888.KEITHLEY
www.keithley.com
(U.S. only)
A GR
TER M
EA
EASU
RE OF CONFIDENCE
DIGITAL MULTIMETERS & SYSTEMS
47
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