Datasheet

The 7703 plug-in module offers 32 channels of 2-pole or 16
channels of 4-pole multiplexer switching that can be configured as
two independent banks of multiplexers. The non-latching reed relays
provide high speeds and are designed for 300 volt, 500 mA; 10 VA.
The relay closures are stored in onboard memory. The 7703 is ideal
for RTD and thermistor temperature applications.
Key Features
• 32 channels for general purpose measurements
• Relay actuation time of less than 1ms for high-speed scanning
• Two- or four-wire measurement
• Two 50-pin female D-sub connectors are standard for secure
hook-up and quick teardown
Series 7700 Plug-In Switch Modules
Channel 1
HI
LO
Channel 16
HI
LO
(Channels 2–15)
Channel 17
HI
LO
Channel 32
HI
LO
(Channels 18–31)
Backplane
isolation
HI
LO
Sense
Backplane
isolation
HI
LO
Input
Channel 35
2-Pole (Closed)
4-Pole (Open)
(see Note)
To Instrument
Backplane
NOTE: Channels 33–35 in this schematicrefer to the designations
used for control and not actual available channels.
For more information, refer to the ROUTE:MULT command
section in the Instrument User’s Manual.
Channel 33
(see Note)
Channel 34
(see Note)
Card Sense
HI
LO
Card Input
HI
LO
7703 32-channel, High Speed, Differential
MultiplexerModule
Datasheet
Specifications
Capabilities
Channels 1–32 Multiplex one of 32 2-pole or one of 16 4-pole signals
into DMM.
Inputs
Maximum Signal Level
Channels (1–32) 300 V DC or rms, 0.5 A switched, 10 W maximum.
Contact Life (typ.) >5×10
4
operations at max. signal level.
>10
8
operations cold switching.
Contact Resistance <1 Ω at end of contact life.
Contact Potential <±3 μV typical per contact, 6 μV max.
<±3 μV typical per contact pair, 6 μV max.
Offset Current <100 pA.
Connector Type 50 pin D-sub ×2.
Relay Drive Current 20 mA per channel.
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)
<0.35 dB below 1 MHz. <3 dB below 2 MHz.
Common Mode Voltage
300 V between any terminal and chassis.
General
32 Channels 32 channels of 2-pole relay input. All channels
configurable to 4-pole.
Relay Type Reed.
Actuation Time <1 ms.
Environmental ans Safety
Operating Environment: Specified for 0° to 50°C.
Specified to 40% 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
Weight 0.8 kg (1.75 lbs).
Supplied Accessories
7703-306A 50-pin D-Sub Male Shell Connector Kit, quantity 2
Available Accessories
7705-MTC-2 50 Pin Male to Female D-sub Cable, 2 m (6.6 ft).
7788 50-pin D-Sub male connector kit, quantity 2
7790 50-pin male, 50-pin female, 25-pin male D-shell IDC
connectors
Available Services
7703-3Y-EW 1-year factory warranty extended to 3 years from date
of shipment
Ordering Information
7703 32-channel, High Speed, Differential Multiplexer
Module
Warranty 1 year