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ADR Functionality User Manual ADR Functional Reference

Event Triggering

The readings from the three axes of the accelerometer pass through several levels of low pass filtering before being

used for triggering and logging.

Event Triggering can be set using the Device Configuration function; see the Events Tab section on page 7. The event

triggering flow is as shown below.

Analogue anti-aliasing filter

(400Hz 2

order Bessel)

Software filter

(250Hz 4

order Butterworth)

User configurable trigger filter

(5Hz-100Hz 2

order Butterworth)

Event triggering against user configurable

thresholds

Software filter for CFC60

100Hz 2

order Butterworth

User configurable trigger filter

(5Hz-100Hz 2

order Butterworth)

Log file containing:

‐ Raw log readings

‐ Log readings filtered to CFC60

‐ Log readings filtered with the user configurable trigger filter

Event Log

ADR Device

PC (ADR Manager)

(400Hz 2

order Bessel)

Accelerometer Internal filter

Figure 10 – Flow of Event Triggering

Event Triggering Methods

The ADR can be configured to use one of three event triggering methods:

The XYZ Vector is the recommended trigger method. A trigger method with separate Z axis settings can be useful in

situations where large Z axis accelerations such as curb impacts are expected.

Trigger on XYZ Vector

An event is triggered when the magnitude of the XYZ acceleration vector exceeds the Event Trigger Level.

The event is marked as a severe event when the magnitude of the XYZ acceleration vector exceeds the Severe Event

Trigger Level.

The same trigger filter settings are used for all axes.

MoTeC — Published: 11 February 2014 Page 14

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