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IM133, Page
SECTION 1: GENERAL DESCRIPTION
1.1 INTRODUCTION
ENDEVCO has remained a leader in the vibration measurement field since 1951, and has
contributed many firsts in vibration sensor design. These include: the first piezoelectric
accelerometer capable of continuous operation from cryogenic temperatures up to +750°F, the
first shear design accelerometer and the world's smallest piezoelectric accelerometer. To support
a broad family of vibration transducers, ENDEVCO has provided a wide variety of signal
conditioners, including the first transistorized charge amplifier, the first computer-programmable
charge amplifier and the first airborne vibration monitoring system that is based on a true digital
tracking filter.
SIGNAL CONDITIONERS
To support the use of its sensors in large scale testing, ENDEVCO has developed several
generations of signal conditioner systems. Until recently, a state-of-the-art vibration laboratory set
up consisted of a rack of manually controlled signal conditioners. These signal conditioners have
manually controlled switches and knobs, to set full scale ranges, sensitivity and filter corners and
the set up information is recorded by hand.
COMPUTER CONTROLLED SIGNAL CONDITIONERS
To eliminate the risk of incorrect amplifier settings, ENDEVCO has pioneered the concept of
computer controlled signal conditioners. The first generation was the Multi-channel Amplifier
Control system (MAC). The second generation was the Computer Controlled Amplifier Systems
(CCAS). The CCAS family consists of five different systems that use the same rack and digital
interface assemblies with different analog boards. These units receive their setup commands over
an IEEE-488 interface bus from a computer/controller, so that tests can be pre-programmed. In
addition, these units provide comprehensive self-test and self-calibration capabilities, which greatly
improves the reliability of the test data. User feedback is indicated that these units pay for
themselves quickly by shortening test cycles, preventing retests and eliminating over-testing.
MANUAL/COMPUTER CONTROLLED SIGNAL CONDITIONERS
The experience gained in the first two generations of computer controlled amplifiers has now been
applied to a third generation product line: the programmable bridge conditioner and the
programmable laboratory signal conditioner. These units are independently controlled and each
unit contains its own power supplies for single channel integrity.
The Model 133, has both manual and computer programmable features. This PE/ISOTRON®
Signal Conditioner is an example of Endevco's commitment to improving the state-of-the-art in
sensory measurements. The new generation is smaller with more features and will continue to be
expanded to meet an ever widening range of application requirements.
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