VTI Instruments EX1200 Series - EX1200-3072: 72-Channel 300 V; 2 A Multiplexer

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EX1200-3072 Plug-in Module 53
EX1200-3072 P
LUG
-
IN
M
ODULE
72-C
HANNEL
300 V/ 2 A M
ULTIPLEXER
The EX1200-3072 high-density multiplexer modules are designed for scanning of 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 432 two-wire (or 216 four-wire) channels
can be accommodated in a 1U EX1200 full rack 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 those in which multiple points need to be switched to a
common resource. All relays also have individual control, and each path allows for hot switching
of up to 300 V and 2 A (60 W dc max).
The EX1200-3072 consists of dual (1 x 36) 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. It also 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 EX1200-3072 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.
349H
Figure 4-19 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. Both single-wire and two-wire programming modes are available. An
optional terminal block provides locking-slide 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
4-18: EX1200-3072 F
RONT
P
ANEL
(F
RONT
V
IEW
)