Why use GPS?
One of the key features of the DL1 range is the built in high accuracy GPS system - this gives the DL1 advantages over other data loggers in 2 key areas - greatly improved track maps and far more accurate speed measurement.
Track Mapping. Conventional data loggers require a "closed circuit" to enable them to calculate the track map; the shape of the track is estimated from a combination of the lateral acceleration and speed. This works adequately in some situations but it becomes increasingly inaccurate for long tracks and impossible for open circuits, motorbikes or boats. In contrast, the GPS will produce high accuracy track maps in almost any situation.
Speed Measurement. While speed is probably the most important parameter that anyone wants to measure using the data logging system, it is also the most inaccurate in a "conventional" system. The normal way to measure speed is to simply attach a pickup to a wheel to detect how fast it is rotating - but the rolling circumference of a tyre changes by 4% just with wear and temperature. Even worse, the error increases significantly under race conditions where the tyre is under load - typically the tyre slips by up to 20% under hard braking going into a corner. Measuring speed using GPS is now common practice in high-end systems - under typical conditions speed error is well under 1%!
What is the maximum g-force/speed that can be measured?
The standard DL1 is configured for a maximum of 2g acceleration. An optional 6g accelerometer range is also available. The maximum measurable speed is about 1000mph.
How often do you get GPS speed updates?
As standard 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. The technology is designed to give the best results in typical racing environments. An optional 20Hz GPS enhancement is available for increased speed accuracy.
How often do you get GPS position updates?
As standard 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. The technology is designed to give the best results in typical racing environments. An optional 20Hz GPS enhancement is available for increased positional accuracy.
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 email@example.com to find your nearest stockist or use our secure online shopping facility.
Is it upgradeable?
Yes, and many of the enhancement options can be added at any time. For example the DL1 CLUB can be upgraded with 20Hz GPS, 20Hz export, 2nd serial port, and PWM output controller at any time. Trade-in service is also available if you wish to upgrade to a different DL1 base model, gyro, or upgrade the accelerometers. The trade in price will depend on your unit's age and condition. Contact firstname.lastname@example.org for further information.
How much data can you log to a Compact flash card?
The DL1 SPORT logs about 18MB of data per hour, so for a 64MB card you could get up to 3.5 hours of data, for a 2GB card you could get about 5 days.
The DL1 CLUB/PRO/WP 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. The maximum 32GB card would give you about 50 days.
Will it work with any memory card?
Whilst we cannot guarantee that the DL1 SPORT works with all compact flash cards, we have successfully tested many makes and sizes of compact flash card, we haven't yet found one it won't work with. A list of flash cards that have been tested is available on the website.
Whilst we cannot guarantee that the DL1 CLUB/PRO/WP works with all SD memory cards, we have successfully tested many makes and sizes of SD card, we haven't yet found one it won't work with.
Is it easy to use?
The DL1 SPORT/CLUB has one button to start and stop logging (for the DL1 PRO/WP a remote button can be fitted, or automatic start/stop functions enabled), 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, which is why we recommend using our default layouts to guide you - after you've become familiar with it, you will be able to analyse data quickly and efficiently.
I have more than one car that I want to use the DL1 in, is there an easy way to accommodate this?
Spare connectors for the DL1 data loggers are available to purchase separately. These are particularly useful if one unit is to be used in multiple vehicles - then it is easy to transfer the logger without having to disturb all of the electrical installation.
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 installed for each hour of data loaded. The PC also requires some means of downloading the data from the data logger's memory cards, there are many options available - normally a USB reader is most convenient.
If you are intend to use video alongside your data, either using the VIDEO4 or 3rd party video licence; you will need a much more powerful PC to run this. Most modern multimedia PCs will be fine with additional video.
Is the DL1 reliable and well made?
The DL1s are absolutely class leading in terms or component quality, build quality and reliability - these are very high quality professional instruments, entirely designed in-house and manufactured in the UK. The units carry the normal 12 month guarantee against manufacturing defects and lifetime email support.