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Sherborne Sensors Limited
Catalog excerpts
In North America call toll free: (877) 486-1766 .. Fax (201) 847-1394 Email: nasales@sherbornesensors.com Rest of World: .. +44 (0) 870 444 0728 .. Fax: +44 (0) 870 444 0729 Email sales@sherbornesensors.com .. website: www.sherbornesensors.com A215-220 - Iss 8.doc A215/A220 Series Gravity Referenced Linear Servo Accelerometers Features .. Available in ranges from ±1g to ± 20g .. High resolution down to 0.05 mg .. Closed loop force balance system .. Flight qualified versions available .. Self-Test facility .. DC Input – DC Output .. Manufactured to ISO 9001:2000 standards .. 1g bias option to compensate for earth’s gravity (A220 only) Introduction The Sherborne Sensors’ range of Servo Accelerometers measure vector acceleration with high accuracy using a closed loop force balance torquer mechanism. All A200 Series Accelerometers operate as a closed-loop torque balance servo system. Refering to the illustration above, the pendulous mass ‘A’ develops a torque proportional to the product of its mass unbalance and the applied acceleration. The movement of mass ‘A’ is detected by position sensor ‘B’ whose output signal is connected to a servo amplifier. The resulting current is fed into the torquer motor ‘C’ which then develops a torque exactly equal to, but directly opposed to the initial torque from the pendulous mass ‘A’. Mass ‘A’ stops moving, assuming a position minutely differing from it’s zero ‘g’ position. Simultaneously, the current to the torquer motor is fed through a stable resistor to provide an output voltage proportional to the applied acceleration. The system is electronically damped by means of a phase advancing network within the integrated servo amplifier. By adjusting the parameters of the servo amplifier and related electronic networks, the operating characteristics of a servo accelerometer can be optimised to suit a particular application. In addition to the instruments offered in this bulletin Sherborne Sensors design accelerometers for specific applications. These custom designed units are often manufactured and tested to conform to military standards. Applications .. Flight test monitoring .. Accident data collection .. Structural health monitoring .. Flight simulators .. Braking control on mass transit systems .. Road bed analysis .. Data acquisition systems .. Low frequency analysis
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In North America call toll free: 1-877-486-1766 .. Fax 1-201-847-1394 Email: nasales@sherbornesensors.com Rest of World: .. +44 (0) 870 444 0728 .. Fax: +44 (0) 870 444 0729 Email sales@sherbornesensors.com .. website: www.sherbornesensors.com Specifications Environmental Characteristics Operating Temperature Range °C (°F) -55 to +95 (-67 to 203) Survival Temperature Range °C (°F) - 65 to 105 (-85 to 221) Constant Acceleration g 100g in all 3 axes without damage Shock 100g, 11ms ½ sine Altitude m (ft) 30,000 (98,400) Environmental Sealing IP65 EMC Directive EN 61326:1998 EMC Emissions EN...
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