PCB Piezotronics Vibration Division ICP 086C01, Инструкция по установке и эксплуатации

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6
Sensors install and connect according to detail procedures described in specific sensor
manuals. Some common installation methods include stud mount, Petro-wax,
cyanoacrylate adhesive, and magnetic. The method used depends on test conditions and
user preference.
In general, sensors connect to the ICP
®
power unit at the jack labeled "XDCR." The jack
labeled "SCOPE" is connected to the readout device (FFT analyzer/computer). Consult
ICP
®
Power Unit Operating Guide for proper installation and operating procedures.
4.0 OPERATION
1. With cables supplied, connect the hammer to a power unit, and then to your analyzer,
as shown in the system and power unit operation guide.
2. Tighten the cable connectors securely by hand to insure good electrical contact.
3. Switch power on, and wait a minute or two for the sensor amplifier to turn on, and for
the coupling capacitor to fully charge.
4. Check the power unit meter for normal operation (meter pointer pointing in green
area).
5. If meter pointer points in the red area, look for shorted cables or connections. If meter
pointer points in the yellow area, look for open cables or connections.
Connect accelerometer(s) in similar manner referring to the appropriate operating guides
for the accelerometer(s) and power unit. When all power unit meters indicate normal
operation (green), proceed with tests, following all sensor, power unit, and analyzer
operating instructions.
4.1 TESTING
To test the behavior of your structure, and to tailor the frequency bandwidth of the force,
follow the following procedures:
1. Strike the test object with the hammer and process the results. Always take several
averages to reduce the effects of spurious noise.
CAUTION: Never impact without a
hammer tip properly installed on the sensor element. In the case of the 086D80, the
sensor element is pre-installed with a steel tip.
2. Check the measured results for signal quality (adequate signal-to-noise), no overloads
(overload lights or sharp flattening of time history peaks), and no double impacts.
3. Analyze results for frequency content, and check to insure that the reasonably flat
portion of the force spectrum is sufficient to cover the structural resonances present in the
acceleration spectrum. Often signal energy is sufficient to excite structural resonances at