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Racing » Products » Data loggers » AX22 » FAQ

AX22 Frequently Asked Questions

• What is the difference between the AX22 and the AC22/AP22 performance meters?

The AX22 is the big brother of the AC22/AP22 performance meters, they all operate in a similar way and have a similar user interface. The big differences is that the AX22 has integrated GPS, compact flash for long data runs and lots of potential for further expansion, making it far more "future proof".

• What is the maximum g-force/speed that can be measured?

The standard AX22 is configured for a maximum of 2g acceleration, 10g is a factory option. The maximum measurable speed is about 1000mph.

• How often do you get GPS speed updates?

The GPS system calculates speed every 200ms (5Hz), This data is combined with the data from the accelerometers to calculate speed 100 times every second with very high accuracy and NO INTERPOLATION.

• How often do you get GPS position updates?

The GPS system calculates position every 200ms (5Hz). This data is combined with the data from the accelerometers to calculate position 100 times every second with very high accuracy.

• How accurately is speed measured?

With average GPS reception, speed accuracy is about 0.1mph (or 0.1% if greater) when you are just driving along at fairly constant speed, and about 0.2mph (or 0.1% if greater) during fast accelerations or braking. The only exception is at very low speeds (under 10mph) where the error increases to about 1mph. 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 high accelerations or braking, the error increases up to about 20%.

• How accurately is position measured?

With good GPS reception, positional accuracy is about 3m (CEP).

• What happens to the data if you drive under a bridge/tunnel/trees etc?
  

Because speed and position are calculated from both the GPS data and accelerometers, even if the GPS data "disappears" for a number of seconds, you won't be able to tell from the data in the software. Only if GPS data disappears for an extended time (20+ seconds) will the data start to degrade noticeably.

• Is it upgradeable?

The AX22 is upgradeable in a number of ways. Software and firmware updates, including new features, are freely available as we introduce them.

• Will it work with any Compact Flash card?

Whilst we cannot guarantee that the AX22 works with all compact flash cards, we have successfully tested many makes and sizes of compact flash card.

• Is it easy to use?

The AX22 has a simple 3 button menu interface, similar to that found on a mobile phone. How difficult it is to use really depends on what you are trying to do - to do a quick 0-60mph timing can be done very quickly and easily, for a complete race analysis it will obviously take a bit longer.

• What specification of computer is required?

As with most programs, the analysis software will run on just about any PC running windows 95 or later - however, the faster the PC, the faster the program will run. The main restriction is the memory required for long runs, typically we recommend that your PC has an absolute minimum of about 30MB of memory installed for each hour of data loaded. The PC also requires some means of downloading the data from the compact flash cards, there are many options available - normally a USB reader is most convenient.

• Is the AX22 reliable and well made?

The AX22 is built from very high quality components, designed and built within the UK and individually tested and calibrated by us to exacting standards. The unit carries the normal 12 month guarantee against manufacturing defects and lifetime email support.