AAA215 | AAA220 Servo Accelerometers

Gravity referenced linear servo accelerometer with pivot-on-stone

About the AAA215 | AAA220 Servo Accelerometers

The AAA200 Series of Servo Accelerometers measure vector acceleration with high accuracy using a closed loop force balance torquer mechanism.

All AAA200 Series Accelerometers operate as a closed-loop torque balance servo system. With reference to the illustration below 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 an 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.


Key features AAA215 | AAA220

  • 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 AS9100C and ISO 9001:2008 standards
  • 1g bias option to compensate for earth’s gravity (AAA220 only)


Applications AAA210 | AAA220

  • 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


Measurement Range
±1 g / ±2 g / ±5 g / ±10 g / ±20 g
0.05 % (up to 10 g), 0.1 % (20 g)
0.02 %FRO (max)
Output [Supply Voltage]
±5 VDC [±15 VDC]
Current Consumption
<± 15 mA
0.0005 % FRO (max)
Natural Frequency
90 Hz(min) / 100 Hz(min) / 115 Hz(min) / 130 Hz(min) / 150 Hz(min)
Damping Ratio
0.6 ± 0.1
Operating Temperature
-55 °C to +95 °C (-67 °F to 203 °F)
Survival Temperature Range
- 65 °C to 105 °C (-85 °F to 221 °F)
Constant Acceleration
100g in all 3 axes without damage
100g, 11ms ½ sine
30,000 m (98,400 ft)
Environmental Sealing
A215: 57 g (2 oz) ; A220: 115 g (4.1 oz)
  • Follow us: