DMU41 Evaluation kit

Quickly test, capture the data, and evaluate the results.

The DMU41 evaluation kit enables the output data from the DMU41 to be viewed and logged for evaluation and development testing purposes. The DMU41 EVK also provides the facility for the user to easily re-configure the DMU41 interface parameters to suit the particular requirements of the host system. The kit excludes the IMU which needs to be purchased separately.

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DMU41 Evaluation Kit
Please explain DMU41's Delta Theta and Delta Velocity outputs

The basic inertial data output from DMU41 is angular rate (deg/s) and acceleration (g). Delta Theta and Delta Velocity outputs can be considered as a re-scaling of these basic data outputs. Provision and use of these values is an industry standard expected and used by many of our customers.

Delta Theta is in degrees and represents the degrees rotated over the sampling time of 5.0ms (or 1/200th of a second). For example, if the IMU axis is rotating at 200deg/s, Delta Theta will be 1 deg.

Similarly, Delta Velocity is a re-scaling from g to m/s, representing the change in velocity change over the same 5ms. The output in m/s is equal to the acceleration in g multiplied by 0.04903325 (divide by 200 and multiply by 9.80665, the latter being a universal measure of g).

What is the resolution of sensor data inside DMU41?

24-bit sigma delta analogue to digital convertors are used within DMU41. Compensation is carried out using single precision floating point mathematics. The DMU41 output message is also output as single precision floating point numbers. So, the mathematical resolution is very small indeed.

In practical terms, the minimum resolvable change is dominated by the sensor noise. With averaging, this can be improved to a point where the minimum resolvable change is dictated by the bias instability derived from Allan Deviation plots. For the gyro channels this is below 0.1 deg/hr and for the accelerometers, around 10μg.

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