Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
1-888-KEITHLEY
www.keithley.com
Specifications are subject to change without notice.
SPEC-3740 Rev. A / September 2007 Page 1 of 3
Model 3740
32 Channel Isolated Switch Card Specifications
28 Form C relays and 4 high power Form A relays
RELAY SWITCH CONFIGURATION: 32 general purpose independent channels. 28 channels of FORM C
switching at 2A and 4 channels of FORM A switching at 7A. 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.
MODEL 3740-ST SCREW TERMINAL OPTION:
#22 AWG typical wire size with .062 inch O.D. 84 conductors maximum. #16 AWG maximum wire size with
.092inch O.D. 44 conductors per card maximum.
MAXIMUM SIGNAL LEVEL:
FORM C: 300V DC or RMS, 2A switched (3A carry), 60W, 125VA.
FORM A: 250VAC 7A, 30VDC 7A, 210W
COMMON MODE VOLTAGE: 300V DC or RMS between any terminal and chassis.
VOLT-HERTZ LIMIT: 8x10
7
.
CONTACT LIFE:
FORM C > 10
5
operations at max signal level.
FORM C >10
8
operations no load.
1
FORM A > 10
5
operations at max signal level.
FORM A > 5x10
7
operations no load
1
CHANNEL RESISTANCE :< .5 at end of contact life
CONTACT POTENTIAL: ±3μV typical per contact
ISOLATION:
CHANNEL TO CHANNEL: >10
9
, <200pF
COMMON MODE: >10
10
, <150pF
CROSSTALK CH-CH (50 load- 50 source):
100KHz : <-50dB
1MHz: <-35dB
10 MHz: <-15dB
BANDWIDTH: 30MHz
1
Minimum signal level 10mV,10uA
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