KEITHLEY 3740 32-channel Isolated Switch Card

Relay Switch Configuration: 32 general purpose independent channels. 28 channels of Form C switching at 2A and 4 channels of Form  A switching at 7 A. Relays can be connected to each other and backplane via removable terminal blocks.

Contact Configuration: General Purpose: 1-pole Form C. High Current: 1-pole Form A.

Connector Type: Two 50-pin male D-shells.

3740-ST Screw Terminal Option: #22 AWG typical wire size with 0.062 inch O.D. 84 conductors maximum. #16 AWG maximum wire size with 0.092 inch O.D. 44 conductors per card maximum.

Maximum Signal:

Level Form C: 300 V DC or RMS, 2 A switched (3 A carry), 60 Ω, 125 VA.

Form A: 250 VAC 7 A, 30 VDC 7 A, 210 Ω.

Common Mode Voltage: 300 V DC or RMS between any terminal and chassis.

Volt-Hertz Limit: 8×10^7

Contact Life:

Form C: >105 operations at maximum signal level. >108 operations no load.1

Form A: >105 operations at maximum signal level, >5×107 operations no load.1

Channel Resistance (end of contact life): <0.5 Ω.

Contact Potential: <±3 μV typical per contact.

Isolation: Channel-channel: 109 Ω, <200 pF. Common Mode: >1010 Ω, <150 pF.

Crosstalk (Channel-channel, 50 Ω load–50 Ω source): 100 kHz: <–50dB. 1 MHz: <–35dB. 1 MHz: <–15dB.

Bandwidth: 30 MHz.

General

Over-Temperature: Temperature sensor indicates over temperature.

Actuation Time: Form C: 4 ms. Form A: 10 ms.

Relay Type: Form C: Latching electromechanical. Form A: Nonlatching electromechanical.

Relay Drive Scheme: Direct.

Interlock: Backplane relays disabled when interlock connection is removed.

Operating Environment: Specified for 0° to 50 °C. Specified to 70% R.H. at 35°C.

Storage Environment: –25° to 65 °C.

Weight:  2.5 lbs.

Safety: Conforms to European Union Directive 73/23/EEC, EN61010-1.

EMC: Conforms to European Union Directive 2004/108/EC, EN61326-1.

Datasheet