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SPEEDBOXR41NoiseEmissionsTestSystem / FrequentlyAskedQuestions

Frequently Asked Questions

  • What is the maximum g-force/speed that can be measured?
The SPEEDBOX is fitted with a 2g accelerometer as standard, but a 6g option is available. The maximum measurable speed is approximately 1000mph.
  • What is the range of the modem?
500 meters
  • How accurately is speed measured?
With average GPS reception, speed accuracy of the SPEEDBOX is about 0.05kph (or 0.1% if greater) when travelling at fairly constant speed or during moderate acceleration and braking, and about 0.1kph (or 0.1% if greater) during hard acceleration or braking. The only exception is at very low speeds (under 10kph) where the error increases to about 0.5kph. Do not be fooled by exaggerated claims from other manufacturers… this is as good as it gets. In contrast, a standard wheel speed pickup is only accurate to about 4% at constant speeds, and under hard acceleration or braking the error increases up to around 20%.
  • How accurate is the distance calculation?
Distance is calculated from integrating speed over time. At a constant speed the distance is accurate to within 1cm over 50 meters. During high dynamics (heavy braking and accelerating) the accuracy decreases to within 2cm.
  • Where can I buy it?
Check for an up-to-date list of stockists and online purchasing
  • Is it easy to use?
The Drive-by-noise system is very simple to install, connect and configure. Full instructions are provided with every unit. With power supply or battery pack connected, the unit automatically starts up and commences measuring and outputting data continuously.
Page last modified on March 13, 2015, at 11:31 AM