Keithley 3721 ACC multiplexer card

The Keithley 3721 offers 2 independent banks of 1x20 two-pole multiplexers for general purpose switching, including temperature measurements. Its analog backplane connection relays provide easy bank and card interconnections. This connection allows the mainframe to reconfigure the card to a single 1x40 two-pole multiplexer or to enable card-to-card expansion for even larger configurations

40 two-pole channels 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 measurement
Analog backplane connection relays provide easy bank and card interconnections
300V, 2A switched or 3A carry signal capacity; 60W, 125VA
Latching electromechanical

Keithley 7700 20-channel Differential Multiplexer Module