Figure 9-6: Model 3721 - Keithley 3720 User Manual

Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
1-888-KEITHLEY
www.keithley.com
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
CONTACT LIFE: > 10
8
> 10
Channel Resistance
(end of contact life)
Contact Potential
(differential)
Offset Current
Isolation
Differential
Bank-Bank
CH -CH
Common mode
Crosstalk CH-CH
300KHz:
1MHz:
20MHz:
Bandwidth
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
Specifications are subject to change without notice.
SPEC-3721 Rev. A / September 2007
40 differential channels, automatic CJC w/3721-ST accessory
7
5
operations at max signal level.
1
operations no load.
Dual 1x20 Channel Multiplexer Specifications
3
Dual 1x20
< 1.0 Ÿ
< ± 1 V
< ±250 pA
9
10 Ÿ, 280pF
11
10 Ÿ, 60pF
9
10 Ÿ, 50pF
9
10 Ÿ,180pF
< -60dB
< -50dB
< -25dB
28 MHz
Model 3721
2, 3
Single 1x40
< 1.5 Ÿ
< ± 3 V
< ±250 pA
9
10 Ÿ, 530pF
--
9
10 Ÿ, 50pF
9
10 Ÿ, 480pF
< -60dB
< -50dB
< -15dB
9 MHz
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