VTI Instruments Corp.
58
EX1200-3096 Plug-in Module
EX1200-3096
P
LUG
-
IN
M
ODULE
96-C
HANNEL
100 V
/
0.5 A
T
WO
-W
IRE
M
ULTIPLEXER
The EX1200-3096 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 576 two-wire (or 288 four-wire) channels can
be accommodated in a 1U EX1200full-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 100 V and 1 A (30 W dc max).
The EX1200-3096 consists of dual (1x48) 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, eliminating external wiring
and helping reduce unterminated stubs. Internal residual voltage discharge relays 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 EX1200-3096 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 (discussed in the
VTEX Switch Driver Programmer’s
Manual
, P/N: 82-0117-000).
352H
Figure 4-21 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
4-20:
EX1200-3096
F
RONT
P
ANEL
(F
RONT
V
IEW
)
Summary of Contents for EX1200 Series
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