Datasheet

DIGITAL MULTIMETERS & SYSTEMS
www.keithley.com
1.888.KEITHLEY
(U.S. only)
A Greater Measure of Confidence
Ordering Information
7702 40-channel Differential
Multiplexer Module
with Screw Terminals
• 40 channels for general-
purpose measurements, plus 2
channels to measure current
• Two- or four-wire measurement
• Oversize screw terminal
connection blocks are standard
for easier connection
• 300V, 1A capacity for voltage
channels; 60W, 125VA
• 3A capacity for current channels
• Relay closures stored in
onboard memory
CAPABILITIES
CHANNELS 1-40: Multiplex one of 40 2-pole or one of 20
4-pole signals into DMM.
CHANNELS 41-42: Multiplex one of 2 2-pole current signals
into DMM.
INPUTS
MAXIMUM SIGNAL LEVEL:
Channels (1-40): 300V DC or rms, 1A switched, 60W, 125VA
maximum.
Channels (41-42): 60V DC or 30V rms, 3A switched, 60W,
125VA maximum.
CONTACT LIFE (typ): >10
5
operations at max. signal level.
>10
8
operations no load
1
.
1
Minimum signal level 10mV, 10µA.
CONTACT RESISTANCE: <1W 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
W,
<100pF.
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >10
9
W,
<200pF.
CROSS TALK (10MHz, 50W Load): <–40dB.
INSERTION LOSS (50W Source, 50W Load): <0.1dB below
1MHz. <3dB below 2MHz.
COMMON MODE VOLTAGE: 300V between any terminal and
chassis.
GENERAL
40 CHANNELS: 40 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.
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: 0.5kg (1.1 lb).
The Model 7702 plug-in module offers 40 chan-
nels of 2-pole or 20 channels of 4-pole multiplexer
switching that can be configured as two inde-
pendent banks of multiplexers
.
The Model 7702
provides two additional protected channels for
current measurements
.
It is ideal for RTD, thermis-
tor, and thermocouple temperature applications.
Channel 1
HI
LO
Channel 20
HI
LO
(Channels 2–19)
Channel 21
HI
LO
Channel 40
HI
LO
(Channels 22–39)
Channel 41
HI
LO
Channel 42
HI
LO
AMPS
HI
LO
Sense
HI
LO
Input
Channel 43
2-Pole (Open)
4-Pole (Closed)
(see Note)
3A
3A
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.
Channels 44 and 45 can be individually
controlled using ROUT e:MULTiple if the
module is not to be connected to the
internal DMM.
Car d Sense
HI
LO
Car d Input
HI
LO
7702
40-channel Differential
Multiplexer Module
with Screw Terminals
SERVICES AVAILABLE
7702-3Y-EW 1-year factory warranty extended to 3 years
from date of shipment
Use with Integra Series mainframes: 2700, 2701, 2750 Use with Integra Series mainframes: 2700, 2701, 2750