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The AC-73-DH sensor package is a true electromechanical triaxial downhole accelerometer designed for broadband earthquake monitoring as well as applications requiring highly sensitive and rugged sensors with minimum maintenance and a simple method for periodic testing. The rugged mass suspension moving coil system improves the signal to noise ratio. The magnetic system and capacitive position sensors offer symmetrical controls for the accurate electronic centring of the mass. At rest the accelerometer mechanism is in balance and no electrical output is generated. In case of a ground motion, AC-73-DH yields an electrical output proportional to the current used to keep the mass centred. This output signal is precisely calibrated to provide a signal at the utmost accuracy and with a lowest possible noise level. The symmetrical positioning system incorporated with the force balance accelerometer principle, the accelerometer faithfully keeps its scaling and calibration even under extreme conditions.

The DC response allows the sensor to be tilt tested or recalibrated in the field. With the help of test leads, the AC73-DH accelerometer can be fully tested to ensure proper operation and accurate acceleration measurements. This test lead is internally connected to the outside world only when a given command is sent to the sensor to avoid any noise through the test input. The AC-73-DH is equipped with electronic offset adjustment, making its installation very user friendly. This powerful feature allows the user to install the AC-73-DH without the need for mechanical offset adjustments and fine leveling. The advanced iSensor? interface allows easy deployment using built-in hardware such as a compass and tilt, temperature and humidity sensors. The sensor can be powered from 9.5 to 18 VDC with the advantage that its power input is isolated from the sensor's electrical ground. This avoids ground loops and reduces noise caused by the power supply