PCB Piezotronics Vibration Division ICP 086C01, Installation And Operating Manual

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5
Model 086D80
2.0 DESCRIPTION
The hammer consists of an integral, ICP
®
quartz force sensor mounted on the striking end
of the hammer head. The sensing element functions to transfer impact force into electrical
signal for display and analysis. It is structured with rigid quartz crystals and a built-in,
micro-electronic, unity gain amplifier. The cable is connected to the end of the handle for
convenience, and to avoid connector damage in the event of a
“
miss hit.
”
The ICP
®
sensor operates over a standard two-wire cable from a PCB
®
power unit. For
reasons of safety, the easily-repairable ribbon wire cable is intended to be the weak link
in larger hammer design. The ICP
®
power unit supplies constant current excitation to the
sensor over the signal lead and AC couples the output signal. Many FFT
analyzer/computer systems have ICP
®
power supply built in.
The hammer is a single, integral unit. Laser-welded construction of the sensor element
insures reliable operation in adverse environments. The mechanical assembly is locked
together with a structural epoxy adhesive so it should not be taken apart except at the
factory.
The striking end of the hammer has a threaded hole for installation of a variety of impact
tips. The tip functions to transfer the force of impact to the sensor, and protects the sensor
face from damage. Tips of different stiffness allow you to vary the pulse width and
frequency content of the force.
3.0 INSTALLATION
The hammer is assembled and locked together with structural adhesive at the factory.
Tips and extender mass install at opposite ends of the hammer via 10-32 threaded studs
(see chapter 4.1 TESTING for hammer/tip extender selection). Cable connections are
illustrated in the system drawing and are generally made via BNC connectors.