Datasheet

www.keithley.com
1.888.KEITHLEY
(U.S. only)
4
SWITCHING AND CONTROL
A GREATER MEASURE OF CONFIDENCE
• 60 two-pole channels or 30
four-pole channels for general
purpose switching
• Automatic CJC for temperature
measurements when used with
3720-ST accessory
• Analog backplane connection
relays provide easy bank and
card interconnections
• 300V, 1A switched or 2A carry
signal capacity; 60W, 125VA
• Screw terminal connections
provided with removable
3720-ST accessory
• Relay closures stored in
onboard memory
• Latching electromechanical
relays
The Model 3720 offers two independent banks of 1×30 two-pole multiplexers. It is ideal for general
purpose switching, including temperature measurements. The two banks can automatically be con-
nected to the Series 3700A mainframe backplane and optional DMM through the analog backplane
connection relays. This connection allows the mainframe to reconfigure the card to a single 1×60
two-pole multiplexer or to enable card-to-card expansion for even larger configurations.
Other features of the Model 3720 include its ability to be reconfigured to coordinated four-pole oper-
ation for additional measurement flexibility. Furthermore, the Model 3720 supports thermo couple-
type temperature measurements when used with the Model 3720-ST (screw terminal) accessory
providing automatic cold junction compensation (CJC).
The Model 3720 uses two 78-pin male D-sub connectors for signal connections. For screw terminal
or automatic CJC, use the detachable Model 3720-ST accessory.
Ordering Information
3720 Dual 1×30
Multiplexer Card
ACCESSORIES AVAILABLE
3720-MTC-1.5 78 Pin D-sub Female to Male Cable, 1.5m (5 ft.)
3720-MTC-3 78 Pin D-sub Female to Male Cable, 3m (10 ft.)
3720-ST Screw Terminal Block (required for auto CJC
thermocouple measurements)
3791-CIT Contact Insertion and Extraction Tool
3791-KIT78-R 78 Pin Female D-sub Connector Kit (contains
2 female D-sub connectors and 156 solder-cup
contacts)
7401 Type K Thermocouple Wire (100 ft.)
3720
Dual 1×30 Multiplexer Card
60 differential channels, automatic CJC w/3720-ST accessory
SERVICES AVAILABLE
3720-3Y-EW-STD 1-year factory warranty extended to 3 years
from date of shipment
3720-5Y-EW-STD 1-year factory warranty extended to 5 years
from date of shipment
C/3720-3Y-STD 3 (Z540-1 compliant) calibrations within 3 years
of purchase*
*Not available in all countries
Dual 1×30 multiplexer card Dual 1×30 multiplexer card