Atec SC-121 User Manual

SC-121

abworks Inc.

L

SINE SERVO CONTROLLER

Vibration testing suddenly got a whole lot easier.

A remarkably convenient operator interface with performance found only in the best
units available make the SC-121 ideal for controlling electrodynamic shakers in almost
any test situation from research and calibration to production testing.

The SC-121 is unmatched
in cost / performance value.

Dual microprocessor design.

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Digital signal synthesis and filtering.

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Two-channel acceleration input and control.

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Flexible programming with non-volatile memory.

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Four independent meters display all control parameters.

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Analog data outputs interface easily to computer analog inputs and x-y recorders.

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2950 airway ave., a-16, costa mesa, ca 92626 • [phone] • fax [phone]

DESCRIPTION

The Labworks model SC-121 Sine Servo Controller
incorporates the latest in microprocessor technology to
provide an economical solution to modern sinusoidal
vibration testing requirements with a remarkably conve­nient operator interface. It is designed for use with vibra­tion test systems requiring sinusoidal vibration between 2
and 10,000 Hz with acceleration levels ranging from .5 to

99.9 g pk and displacement requirements from .02 to 2.5
inches pk-pk.

The servo provides an output that will give a constant
displacement and or acceleration level during a swept or
stationary sine test by means of an acceleration feedback
signal.

integration of the channel 1 servo loop acceleration
signal. A dual microprocessor design ensures that all
commands bring immediate control response without
degrading the performance of the control system.

Crystal controlled digital signal synthesis and filtering
insures that the Labworks model SC-121 has performance
specifications found only in the best controllers available.

The SC-121 has two acceleration input channels to
facilitate tests requiring the comparison of two signals,
such as calibration or transmissibility tests. The
output makes transmissibility determination and calibration
tests as easy as running a simple sine test.

difference

Vibration displacement is generated internally by double

Tests using large head shakers, slip tables or large fixtures

We packed the SC-121 with performance.

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Wide frequency range: 2.0-6,553 Hz

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or (4.0-10,000 Hz).

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High resolution: 0.1 Hz. or (0.2 Hz).

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Two independent input channels with

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built-in conditioning amplifiers.

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The built-in input amplifiers have a current

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source and adjustable sensitivity.

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Three separate digital meters monitor

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frequency, acceleration and
displacement.

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Test cycle counter displayed on

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frequency meter upon demand.

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Control modes: channel 1 or average

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(channel 1 and channel 2).

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Output modes: Log channel 1 accel., Log

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channel 2 accel., Log average accel., linear
difference ratio.

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Convenient user interface: requires little

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or no documentation to set up or run.

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Three program storage in internal non-

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volatile memory for easy recall of frequently
used tests.

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Analog and TTL inputs and outputs allow

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the controller to function with either
a PC or other test control or recording
instruments.