MTS FlexTest Models 200 - Manual (Page 169)

Model 494.21 Multi-Range DUC with Acceleration
MTS FlexTest® Models 40/60/100/200 Controller Hardware Mezzanine Cards 169
Transducer input This card includes a multi-range digital universal conditioner (DUC) that
you can configure as either an AC conditioner or a DC conditioner.
Transducers connect to the card through a front-panel RJ-50 connector on
the I/O carrier board.
The DUC circuit is similar to other Series 494 DUCs with the addition of an
AC transducer demodulator (located before the summing amp). The
demodulator allows you to apply an electrical zero offset to AC transducer
signals.
Accelerometer input
signals
Software settings specify the type of accelerometer connected to the card.
Bridge Device–provides an input for a bridge-type accelerometer.
Current Source–provides 3.5 mA current-source excitation and a
differential amplifier for direct accelerometer connections.
Buffered Accel Output–accepts the buffered output from an external device
such as a charge amplifier.
Accelerometer gain
settings
The gain for the bridge and current source accelerometer inputs are factory
set to match a specific accelerometer.
Accelerometer adapter
box
The adapter module provides an interface between various accelerometer
types and the Model 494.21 Card.
Analog-bus signal
routing
Factory-installed board modifications provide signal routing to one of four
analog busses. This allows physical signal routing to various points on the
Model 494.21 Card or on other cards that are installed on the same I/O
carrier board.
Electrical zero
The DUC circuit allows you to apply a software-controlled electrical offset
to the transducer signal before it enters the summing amp. This allows you to
compensate for large offsets to help prevent signal saturation.
Note The Model 494.21 Card can be configured for a number of custom
applications. For custom applications, refer to the system
configuration drawings for analog bus routing, interconnects, cable
part numbers, and other information.
J1 Buff
Accel Out
J3
494.21 Input
J2 Bridge
Accel In
Current
Accel In
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