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SPEEDBOX20 / AnalogueDigital

Analog/Digital

Analogue Scaling

The box in the top, left hand corner of the Analog/Digital tab,

allows you to alter both the FSD (Full Scale Deflection) of analogue speed, and the Acceleration Scale. The FSD may be set anywhere between 10 and 500 m/s depending on your needs. The acceleration scale may be set at between 0.1 and 10v per g of acceleration 2.5v is always equal to 0g.

Select Speed Source

Beneath this, you will find another box,

click on the appropriate option to select whether you want to output the combined data from both the GPS receiver and the accelerometers, or output just the GPS data on its own. For most applications, it is recommended that you use the combined data. Only in extreme circumstances – such as on a boat in very rough seas – should you turn off the data from the accelerometers.

Distance Pulse Output

This feature may be turned off if it is not required.

The number of pulses per meter should be set according to your application. A higher number of pulses will provide you with better resolution at low speeds. In order to reach higher speeds however, a lower number of pulses should be set. The default setting for this feature is 100 pulses per meter.

The pulse type may be set to either Fixed Width (which will give a fixed high time but a variable low time), or 50% Duty Cycle (which will give you equal high and low times). In both cases speed is proportional to the period of the pulse.

You can use the Pulse high time box to set the high time at anywhere between 10 and 1,000 us.

At the bottom of the box, you will see a figure highlighted in grey. This figure tells you the speed at which the readings will clamp. This figure will instantly update as you alter the settings to the Distance Pulse Output.

Page last modified on January 28, 2010, at 10:07 AM