DESCRIPTION
The auto industry standard for on-board vehicle test, the
Model 428 is small and rugged but is able to condition and amplify
the signals from almost any bridge type transducer including
strain gages, load cells, and RTDs. On the test tracks, the
Model 428 can produce high accuracy data despite temperature
extremes and high shock and vibration conditions. RFI/EMI protection
is available to minimize the effects of the many spurious signals
from today's on-board electronics or even telemetry transmitters.
Models with compatible enclosures are available for crash test
and other extreme applications.
The Model 428 is a true differential
amplifier with transformer isolation between input, output
and the power source. An internal
dc/dc converter provides bi-polar voltages for the circuitry
while accepting power from a single external dc power supply
or battery. This is 12 volts for automotive applications
or 28 volts for airborne systems. In addition to the high performance
dc amplifier, the units can be optionally supplied with integral
strain gage excitation supplies and bridge balance or zero
suppression. Transformer coupling contributes to high common
mode rejection and the chopper design results in superior
zero stability. The use of top grade components and a rigorous
testing program ensures reliable operation over a wide range
of ambient temperatures.
The Model 428 amplifier is packaged in a rugged,
compact steel case and will withstand high shock and vibration
levels under fully operational conditions. The Model 428 is intended
for rack mounting and is equipped with a front panel gain switch.
Zero controls are also located on the front panel in accordance
with the options selected. The front panel dimensions are 1.1" by
2.37" and the depth is 4" (plus connector and controls).
The R408 Series enclosures are 3.5" high and optionally
contain 115 VAC power supplies. A full one year warranty
applies when the equipment is used under any environmental
conditions within its rating.
400 SERIES ENCLOSURES
Ectron 400 Series enclosures provide connector interface for
power and signal input and output connections for 400 Series
products. Portable, bench mount, rack mount, and signal-conditioning
systems are available with capacities from 6 to 22 conditioners.
The following Ectron products are interchangeable in these
enclosures: the Models 352 and 428 conditioner amplifiers,
the Model 441A/AL frequency-to-voltage converter, and the Model
451 LVDT/RVDT signal conditioner. Thermocouple conditioning
can be added using the 200 Series T/C Mate.
Model E408-1D Channel Enclosure shown
with optional DIN rail mount
Model E408-6 Six Channel Portable Enclosure (front and rear views)
 
Model R408-14 Rack Mount Enclosure (front and rear view)
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