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Racing » Products » Data loggers » DL1 » FAQ

DL1 Frequently Asked Questions

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

The standard DL1 is configured for a maximum of 2g acceleration, 6g 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 (5 Hz), however this data is combined with the data from the accelerometers to calculate speed 100 times every second with very high accuracy.

• How often do you get GPS position updates?

  The GPS system calculates position every 200ms (5 Hz), however 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.

• Where can I buy it?

  Contact ussales@race-technology.com to find your nearest dealer or use our secure online shopping facility

• Is it upgradeable?

  The DL1 is upgradeable in a number of ways; please check http://www.race-technology.com/WebPage2/Products/Software/SoftwareHome.html for an up-to-date list of options. Software and firmware updates, including new features, are freely available as we introduce them.

• How much data can you log to a Compact flash card?

  The DL1 logs about 27MB of data per hour, so for a 64MB card you could get up to about 2.4 hours of data, for a 2GB card you could get about 3 days!

• Will it work with any Compact Flash card?

  The DL1 will work with most but not all CF cards, the cards we sell have been extensively tested with our products.

• Is it easy to use?

The DL1 has one button to start and stop logging, how much simpler could we have made it? We have kept the software as simple as possible whilst making it as flexible as we can to ensure that you can do what you need to with it. As with all computer programs, the first time you use it there is a lot to take in - after you've become familiar with it, you will be able to analyse data quickly and efficiently.

• What specification of computer is required?

  As with most programs, the analysis software will run on just about any PC with 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 free for each hour of data loaded, more is better. Typically, writing in 2008, just about any PC sold in the last few years is adequate. Windows XP seems to be the best OS. 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 DL1 reliable and well made?

  The DL1 is absolutely class leading in terms or component quality, build quality and reliability - this is a very high quality professional instrument, entirely designed in-house and manufactured in England. The unit carries the normal 12 month guarantee against manufacturing defects and lifetime email support.