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EX1200-3048 Plug-in Module
43
EX1200-3048
P
LUG
-
IN
M
ODULE
48-C
HANNEL
300 V/
2 A
M
ULTIPLEXER
EX1200-3048 high-density multiplexer modules are designed for scanning multiple points to a
common bus in either 2- or 4-wire configurations, either synchronously, with the EX1200 system
DMM scan function, or asynchronously, as a system switch to other devices through LXI LAN
messages or the hardware trigger bus. Up to 288 two-wire (or 144 four-wire) channels can be
accommodated in a 1U EX1200 mainframe for maximum density, or mixed and matched with
other EX1200 plug-ins for flexibility. Applications include cable harness testing, semiconductor
and PCB testing, and in applications where multiple points need to be switched to a common
resource. All relays have individual control and each path allows for hot switching of up to 300 V
and 2 A (60 W dc max). The EX1200-3048 also has the capability to directly measure up to 2 A.
The EX1200-3048 consists of dual (1 x 24) 2-wire multiplexer banks. Each bank can be
interconnected within a module under program control (via bussing relays) and across modules via
the EX1200 analog bus to configure larger multiplexers as required. This eliminates external
wiring and helps reduce unterminated stubs. The EX1200-3048 has internal residual voltage
discharge relays which can be enabled to momentarily short out the measurement path when
changing from one input channel to the next. This dissipates any voltage held by the wiring and
instrument input capacitance. These relays protect sensitive devices, such as CMOS circuits, from
residual voltages caused by previous high-voltage measurements. This feature can also be disabled
in low-voltage applications where maximum throughput speed is important.
The EX1200-3048 can be controlled programmatically using IviSwtch-compliant calls. Both path
level programming and individual relay control are available. Refer to the host driver
documentation for additional details.
343H
Figure 4-15 provides a logical diagram of the switch module
and identifies the switches used by the module. This information can be used for individual relay
control through the driver. An optional terminal block provides screw termination points for
external field wiring. This terminal block also includes cold junction compensation reference for
more precise temperature measurements.
C
ONNECTOR
P
INS AND
S
IGNALS
F
IGURE
4-14:
EX1200-3048
F
RONT
P
ANEL
(F
RONT
V
IEW
)
Summary of Contents for EX1200 Series
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