Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
1-888-KEITHLEY
www.keithley.com
Specifications are subject to change without notice.
SPEC-3721 Rev. A / September 2007 Page 1 of 3
Model 3721
Dual 1x20 Channel Multiplexer Specifications
40 differential channels, automatic CJC w/3721-ST accessory
MULTIPLEXER CONFIGURATION: Two independent 1x 20 2-pole Multiplexers. Banks can be connected together
via relay creating a single 1 x 40 Multiplexer. Banks can be isolated from the backplane by relays. Card can be
configured for common side Ohm measurement via back plane relays.
Channel (41-42): Multiplex one of two 2-pole current signals into DMM
CONTACT CONFIGURATION: 2 pole form A.
CONNECTOR TYPE: Two 50 pin male D-shells. Removable screw terminal option.
MAXIMUM SIGNAL LEVEL:
Channels (1-40): 300V DC or RMS, 2A switched (3A carry), 60W, 125VA Maximum.
Channels (41-42): 60V DC or 30VRMS, 3A switched, 60W, 125VA Maximum. Fused 3A, 250V RMS
COMMON MODE VOLTAGE: 300V DC or RMS between any terminal and chassis. Channels (1-40)
VOLT-HERTZ LIMIT: 8x10
7
CONTACT LIFE: > 10
5
operations at max signal level.
> 10
8
operations no load.
1
Dual 1x20
3
Single 1x40
2, 3
Channel Resistance
(end of contact life)
< 1.0 < 1.5
Contact Potential
(differential)
< ± 1 V < ± 3 V
Offset Current < ±250 pA < ±250 pA
Isolation
Differential 10
9
, 280pF 10
9
, 530pF
Bank-Bank 10
11
, 60pF --
CH -CH 10
9
, 50pF 10
9
, 50pF
Common mode 10
9
,180pF 10
9
, 480pF
Crosstalk CH-CH
300KHz:
1MHz:
20MHz:
< -60dB
< -50dB
< -25dB
< -60dB
< -50dB
< -15dB
Bandwidth 28 MHz 9 MHz
1
Open detector enabled during thermocouple measurements. Minimum signal level 10mV,10uA
2
3706 mainframe with all DMM backplane relays disconnected. Maximum two card backplane relays closed.
3
Connections made using 3721-ST accessory
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