This is the instruction manual for the Endevco® Model 727 series of accelerometers, which are used for shock measurements in mobile consumer electronic devices.
The Endevco Model 727 is a family of rugged undamped piezoresistive accelerometers designed for shock measurements in mobile consumer electronic devices. This instruction manual supplies technical detail for the single-axis accelerometers in wax mount configuration, including a summary of the current offering of drop-test accelerometers.
The document details critical handling precautions to avoid damage from high-frequency impacts and electrostatic discharge (ESD). It also covers mounting surface preparation, installation procedures using adhesives like Aremco CrystalbondTM 509, and cable handling techniques to prevent signal noise and mechanical failure. Finally, it outlines electrical considerations, including excitation voltage requirements and the effects of cable length on sensitivity and signal attenuation.
| Product Type | Undamped piezoresistive accelerometers |
|---|---|
| Application | Shock measurements in mobile consumer electronic devices |
| Excitation Voltage (Calibration) | 10.000±0.005 Vdc |
| Max Excitation Voltage | 12 Vdc |
| Standard Cable Length | 120 inches |
| Input Resistance (Typical) | 650Ω ± 300Ω |
Undamped accelerometers are more susceptible to damage by handling, particularly from fast rise time impacts like dropping on a metal surface. They should be handled by properly grounded technicians at ESD safe work stations.
Aremco CrystalbondTM 509 is recommended for use up to 60°C. Cyanoacrylate (super glue) is not recommended unless an appropriate solvent is used to weaken the joint before removal.
The mounting preparation should allow the cable to be routed perpendicular to the primary shock direction. A small bend should be formed within two inches of the case and the cable secured with tape and silicone RTV.