6
Connect the other end of the cable to the
"Sensor" jack of the Dytran power unit (Models 4102C,
4103C, 4110C, 4114B1, etc.) and switch the power
on.
Observe the monitor voltmeter located at the
front panel of each of the power units. If the meter
reads in the mid-scale region, (labeled "Normal"), this
tells you that the cables, accelerometer and power unit
are functioning normally and you should be able to
proceed with the measurement.
Check for shorts in the cables and connectors
if the meter reads in the "Short" region. Check for
open cables or connections if the meter reads in the
"Open" area. In this manner, the meter becomes a
trouble shooting tool for the measurement system.
HIGH FREQUENCY RESPONSE
All piezoelectric accelerometers are basically
rigid spring mass systems, i.e., second order systems
with essentially zero damping. As a result, these
instruments will exhibit a rising characteristic as the
resonance is approached. A filter incorporated into
Model 3049E Series compensates for this rise.
The frequency at which the sensitivity may
increase or decrease by 5% is approximately 10,000
Hz, the frequency to which the 3049E Series series is
calibrated. The accelerometer is usable above this
frequency but to use it above 10,000 Hz, it must be
calibrated at the specific frequencies of intended use
because sensitivity deviations will increase drastically
as you greatly exceed this high frequency calibration
limit. Consult the factory for special calibrations
required above 10kHz.
CAUTIONS
1) Do not store or use the 3049E Series above
250 degrees F. To do so can damage the IC amplifier.
2) Do not allow cables to vibrate unrestrained.
This will eventually destroy the cable and could lead to
system inaccuracies.
3) Avoid dropping or striking the
accelerometer, especially against rigid materials such
as concrete and metals. While Model 3049E Series is
protected against shock induced overloads, the very
high overloads induced by dropping can do permanent
damage to the IC amplifier or to the mechanical
structure of the accelerometer. This type of damage is
not covered by the warranty.
MAINTENANCE AND REPAIR
The welded construction of the series 3049E
Series precludes field repair.
Should the mounting surface become
distorted, nicked and otherwise distressed, it can be
redressed by
CAREFULLY
wiping on a new sheet of
400 grit emery paper on top of a clean surface plate
(3049E1 and 3049E3 only). We stress "carefully"
because if not done properly, this procedure can do
more harm than good. Press the surface firmly against
the paper and draw directly toward you in several
short precise strokes making sure that the surface
remains in full contact with the paper and does not
"rock". Rotate the accelerometer 90 degrees and
repeat the procedure. When you observe the bottom
surface it should appear perfectly flat with straight
marks across it. If you cannot achieve flatness with
several attempts, return the instrument to the factory
for repair.
Should the electrical connector become
contaminated with moisture, oil, grease, etc., the entire
instrument may be immersed in degreasing solvents to
remove the contaminants. After degreasing, place the
instrument in a 200°F to 250°F oven for one hour to
remove all traces of the solvent.
Should a problem be encountered with the
operation of the instrument, contact the factory for
trouble shooting advice. Often our service engineers
may point out something which may have been
overlooked and which may save the expense and time
of returning the 3049E Series to the factory.
If the instrument must be returned, the service
department will issue you a
R
eturned
M
aterials
A
uthorization (
RMA
) number to aid in tracking the
repair through the system. Do not send the instrument
back without first obtaining an RMA number. At this
time you will be advised of the preferred shipping
method.
A short note describing the problem, included
with the returned instrument, will aid in trouble
shooting at the factory and will be appreciated.
We will not proceed with a non-warranty repair
without first calling to notify you of the expected
charges. There is no charge for evaluation of the unit.
Содержание 3049E Series
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