7700 20-Channel Differential Multiplexer w/Automatic CJC
GENERAL
20 CHANNELS: 20 channels of 2-pole relay input. All channels config-
urable to 4-pole.
2 CHANNELS: 2 channels of current only input.
RELAY TYPE: Latching electromechanical.
ACTUATION TIME: <3ms.
CAPABILITIES
CHANNELS 1-20: Multiplex one of 20 2-pole or one of 10 4-pole signals
into DMM.
CHANNELS 21-22: Multiplex one of 2 2-pole current signals into DMM.
INPUTS
MAXIMUM SIGNAL LEVEL:
Channels (1-20): 300V DC or 300V rms (42.5V peak) for AC waveforms,
1A switched, 60W, 125VA maximum.
Channels (21-22): 60V DC or 30V rms, 3A switched, 60W, 125VA maxi-
mum.
CONTACT LIFE (typ): >10
CONTACT RESISTANCE: <1Ω at end of contact life.
CONTACT POTENTIAL: <±500nV typical per contact, 1µV max.
OFFSET CURRENT: <100pA.
CONNECTOR TYPE: Screw terminal, #20 AWG wire size.
ISOLATION BETWEEN ANY TWO TERMINALS: >10
ISOLATION BETWEEN ANY TERMINAL AND EARTH: >10
CROSS TALK (50Ω Load):
10MHz: <–40dB <-40dB
25MHz: ** <-25dB
* Channels 24 and 25 are open. Refer to ROUTe:MULTiple command
in 27xx User’s manual.
** Not valid
INSERTION LOSS (50Ω Source, 50Ω Load):
<0.1dB 1MHz 1MHz
<3db 2MHz 50MHz
* Channels 24 and 25 are open. Refer to ROUTe:MULTiple command
in 27xx User’s manual.
COMMON MODE VOLTAGE:300V or 300V rms (42.5V peak) for AC wave-
forms between any terminal and chassis.
T/C COLD JUNCTION: 1.0°C (18°–28°C Mainframe Temp)
5
operations at max signal level.
>108operations cold switching.
<±500nV typical per contact pair, 1µV max.
10
Ω, <100pF.
w/Internal DMM w/o Internal DMM*
w/Internal DMM w/o Internal DMM*
1.5°C (0°–18°C & 28°–50°C Mainframe Temp).
9
Ω, <200pF.
Card Input
Card Sense
Cold junction
Ref x3
Channel 1
(Channels 2–9)
Channel 10
Cold junction
Ref x3
Channel 11
(Channels 12–19)
Channel 20
Channel 21
Channel 22
AMPS
Card
LO
LO
LO
LO
LO
LO
LO
LO
LO
HI
HI
HI
HI
HI
HI
HI
HI
Channel 23
2-Pole (Open)
4-Pole (Closed)
(see Note)
3A
3A
Channel 25
(see Note)
Backplane
isolation
Channel 24
(see Note)
Backplane
isolation
NOTE Channels 23–25 in this schematic
refer to the designations used for
control and not actual available channels.
For more information, refer to the
ROUTe:MULTiple command section
in the Model 2700 User’s Manual.
Channels 24 and 25 can be individually
controlled using ROUTe:MULTiple if the
module is not to be connected to the
internal DMM.
AMPS
HI
Input
LO
HI
Sense
LO
To Model 27xx
Backplane
ENVIRONMENTAL:
OPERATING ENVIRONMENT: Specified for 0°C to 50°C.
STORAGE ENVIRONMENT: –25°C to 65°C.
WEIGHT: 0.45kg (1 lb).
Specified to 80% R.H. at 35°C.
HW 10/10/02
Rev. B
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