1. Installing The unit
As the DL1 contains accelerometers, it is important that the unit is mounted on a flat, fairly level surface in the vehicle. A small amount of tilt can be compensated for in the software, however, large tilt angles cause loss of resolution and increased noise due to vertical vibration. Click here for instructions on compensating for accelerometer tilt.
Just as importantly, the logger must be mounted "squarely" in the vehicle with the buttons facing towards the back of the vehicle. If the unit is mounted at an angle to the direction of travel for the vehicle, then the unit will be measuring longitudinal accelerations when you are cornering and vice versa. Acceleration errors caused by mounting the unit at an angle to the direction of travel cannot be compensated for, so it is important to get it right.
If the logger is to be fitted permanently in the vehicle, then the logger can be secured using the two mounting lugs supplied. These are fitted by sliding them down the slots in the side of the logger and then screwed into the vehicle. The logger can be removed from the vehicle by loosening the mounting screws which hold the lugs to the vehicle, and then sliding the meter backwards or forwards to remove it from the lugs. There is no need to completely remove the screws. Please note, no screws are supplied with the DL1.
If the logger is to be moved frequently from one vehicle to another, then BluTak™ or Velcro™ tape can be used as an alternative to the mounting lugs, these are supplied with the unit. Alternatively, additional mounting lugs are available from Race Technology. Contact firstname.lastname@example.org for more information.
The DL1 Unit is supplied with a cigar lighter based power supply. The centre pin connects to +12V and the outer connects to the vehicle ground. This method is convenient if you are temporarily connecting the unit to the vehicle (typically on a road car).
If you want to permanently wire the DL1 Unit directly into the engine wiring loom, rather than using the cigarette lighter socket, then you must use a fused supply with a fuse rating of no more than 1 amp. It is also highly recommended that the unit has it's own external power switch so it can be easily turned off. This is to prevent any draining of the battery, or any damage to the unit when the engine is turned on or when the car is being cranked over. It is recommended that you only turn the unit on once the engine is running. It is possible that leaving the DL1 turned on during cranking may corrupt the data in the logger.
Also please note that in all cases the GPS receiver is powered on whenever there is power to the main unit - it does not turn on and off with the main unit, so if the DL1 is left connected to the battery it will flatten it.
Alternatively, the DL1 can be powered from a separate battery if required - this is often appropriate for temporary installations where a cigar lighter is not available. The DL1 requires a minimum of 10v and draw about 100mA-200mA, so the size of the battery should be chosen to give sufficient run time. For example a 1Ah battery would give about 5 hours operation. Because of the current supply requirements only rechargeable batteries should be used, you cannot use disposable batteries. If you do require a battery pack, Race Technology keep a wide selection in stock - call us with your requirements.
Start the vehicle, wait a few seconds then connect the power lead to the unit. After a few seconds, the "Power" LED will come on and the "status" light will flash. Wait for a few minutes to enable the GPS to obtain a good positional lock. Once the receiver has a lock, the GPS status light on the DL1 will start flashing every second, first a slow flash, then a fast "blink" for each satellite it has locked on to. The first time the DL1 is used it will take a while to lock on, subsequent times the process will be faster.
1.3 Further reading
For more information, click on the following links: