Datasheet

ManualsBrandsKEITHLEY ManualsTest & Measurement Accessories3721

SWITCHING AND CONTROL

www.keithley.com

1.888.KEITHLEY

(U.S. only)

A Greater Measure of Conﬁdence

• 40 two-pole or 20 four-pole

channels for general purpose

switching

• 2 dedicated channels for

current measurements, 3A

capacity

• Automatic CJC for temperature

measurements when used with

3721-ST accessory

• 4-wire common side ohms input

supports 40 channels of 4-wire

ohms measurements

• Analog backplane connection

relays provide easy bank and

card interconnections

• 300V, 2A switched or 3A carry

signal capacity; 60W, 125VA

• Latching electromechanical

relays

The Model 3721 offers two independent banks of 1×20 two-pole multiplexers that are ideal for

general purpose switching, including temperature measurements. The two banks can automatically

be connected to the Series 3700A mainframe backplane and optional DMM through the analog back-

plane connection relays. This connection allows the mainframe to reconfigure the Model 3721 as a

single 1×40 two-pole multiplexer or to enable card-to-card expansion for even larger configurations.

The Model 3721 provides a number of other features. In addition to the 40 channels, two fused chan-

nels are supplied for current measurements. Also, the Model 3721 includes dedicated inputs that

enable 40 channels of four-wire common side ohms measurements. For thermocouple type measure-

ments, automatic cold junction compensation (CJC) is supported when used with the Model 3721-ST

(screw terminal) accessory.

The Model 3721 uses two 50-pin male D-sub connectors for signal connections. For screw terminal or

automatic CJC, use the detachable Model 3721-ST accessory.

Ordering Information

3721 Dual 1×20

Multiplexer Card

ACCESSORIES AVAILABLE

3721-MTC-1.5 50 Pin D-sub Female to Male Cable, 1.5m (5 ft.)

3721-MTC-3 50 Pin D-sub Female to Male Cable, 3m (10 ft.)

3721-ST Screw Terminal Block (required for auto CJC

thermocouple measurements)

3790-KIT50-R 50 Pin Female D-sub Connector Kit (contains

2 female D-sub connectors and 100 solder-cup

contacts)

7401 Type K Thermocouple Wire (100 ft.)

3721

Dual 1×20 Multiplexer Card

40 differential channels, automatic CJC w/3721-ST accessory

SERVICES AVAILABLE

3721-3Y-EW-STD 1-year factory warranty extended to 3 years

from date of shipment

3721-5Y-EW-STD 1-year factory warranty extended to 5 years

from date of shipment

C/3721-3Y-STD 3 (Z540-1 compliant) calibrations within 3 years

of purchase*

*Not available in all countries

Dual 1×20 multiplexer card

Summary of content (2 pages)

PAGE 1
3721 Dual 1×20 Multiplexer Card 40 differential channels, automatic CJC w/3721-ST accessory • 40 two-pole or 20 four-pole channels for general purpose switching • 2 dedicated channels for current measurements, 3A capacity • 4-wire common side ohms input supports 40 channels of 4-wire ohms measurements • Analog backplane connection relays provide easy bank and card interconnections • 300V, 2A switched or 3A carry signal capacity; 60W, 125VA • Latching electromechanical relays The Model 3721 offers two in
PAGE 2
3721 Dual 1×20 Multiplexer Card Multiplexer Bank 1 Channel 1 HI LO HI Analog LO Backplane 3 Channel 20 HI Analog LO Backplane 5 HI LO HI Analog LO Backplane 6 Multiplexer Bank 2 Output 2 Channel 21 HI Analog Backplane 1 LO (DMM Input) HI Analog Backplane 2 LO (DMM Sense) HI LO HI LO HI Analog LO Backplane 3 HI Analog LO Backplane 4 Channels 22–39 Channel 40 HI Analog LO Backplane 5 HI LO HI HI Analog LO Backplane 6 Notes 3A Analog Backplane 1 (DMM Input LO) LO HI 1.