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ENDEVCO 727 Instruction Manual

Piezoresistive drop test accelerometers
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INSTRUCTION MANUAL
For Model 727
PIEZORESISTIVE DROP TEST ACCELEROMETERS
IM727, Revision A (07-10-13)
IM727 Rev A, Page 1 of 9

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Summary of Contents for ENDEVCO 727

  • Page 1 ® INSTRUCTION MANUAL For Model 727 PIEZORESISTIVE DROP TEST ACCELEROMETERS IM727, Revision A (07-10-13) IM727 Rev A, Page 1 of 9...
  • Page 2 727-2K In addition to being undamped, the 727 series has no mechanical stops, maximizing both bandwidth and amplitude linearity. Its undamped characteristic allows it to be used in applications where the peak acceleration is known and there is not a significant amount of out-of-band energy that could cause enough resonance excitation to exceed the overrange limit of the accelerometer.

  • Page 3: Handling Precautions

    Endevco® drop-test accelerometers are shipped in electrostatic discharge (ESD) safe packaging. When handling any accelerometer it is always best practice to handle with ESD in mind. The accelerometer should only be handled by properly grounded technicians (via wrist straps or heel straps) at ESD safe work stations.

  • Page 4: Cable Handling

    CABLE HANDLING The 727 series of drop-test accelerometers are supplied with integral cables, which are terminated in pigtails. The user can select an appropriate end-connector. There are two important considerations regarding the integral cable when installing the accelerometer.

  • Page 5: Electrical Considerations

    3. Cable Length Considerations – The 727 accelerometers are calibrated with 120 inches of cable, unless otherwise specified at the time of order. When using cables longer than 10 – 20 feet , three effects must be taken into account: a.
  • Page 6 ® If cable lengths longer than 20 feet are required then it is recommended to use a signal conditioner with an excitation sense (remote sense) feature. In brief, to use excitation sense a secondary cable (longer) is spliced to the existing accelerometer cable (shorter).

  • Page 7: Operating Precautions

    Another thing to note is that each seismic element used on the 727 series includes two masses, each with its own resonant frequency. If both resonant frequencies are excited, a beat frequency may appear in your data that will be at a frequency equivalent to the difference between the two resonant frequencies.
  • Page 8 REMOVAL OF THE ACCELEROMETER To remove the 727 accelerometer from your application, please use the supplied removal tool, Endevco® part number 42894. The tool should be placed over the accelerometer with the cable positioned away from the tool to shear the accelerometer off the surface of your application by gently wriggling the tool in clockwise and counterclockwise directions.
  • Page 9 QUESTIONS ® If you have any questions regarding the use of these accelerometers (or any other Endevco product) please contact Endevco’s Application Engineering at +1 (866) ENDEVCO [+1 (866) 363- 3826] in North America, or your local sales representative.

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