Download - Little, Big Racing

R&S Business Unit Automotive
4.2 – Memory / Cobra
Via L.Romagnoli, 24 - 41033 Concordia sulla Secchia (Modena) Italy
Tel.: +39 0535 57711 (r.a.) - Fax.: +39 0535 54550
Uffici amministrativi: Via G. Brodolini, 35 - Fax.: +39 0535 54533
Email : guest@digitek.it - Internet : http://w w w .digitek.it
The Cobra data logger has 1 memory location of 32Mb referred to as Local disk.
DATAVIEW Pg. 34/133
Lap storage
The data is divided within the logger as separate files; the file division is normally created when a lap beacon signal
is seen. With this method the user is able to download individual laps rather than removing all of the laps stored in
memory. A download of multiple laps only creates a single file on your PC.
Latest data - on/off
From table Manager the user is able to decide which type of memory management is used.
Latest data on – When the logger memory becomes full the oldest lap file is deleted from memory as an entire block
Latest data off - When the logger memory becomes full the memory storage stops, new data can only be stored if
the Clear data command is used. See section 5.1
Auto lap Limit
This is an internally imposed maximum size for any one internal lap file, when the limit of 3Mb (typical Cobra setting)
is reached a new lap file is automatically created. This Auto lap Limit is needed for data security, systems which do
not use a lap timing beacon may fill up the memory without ever seeing a lap beacon signal, the latest data function
would then automatically remove the oldest lap file, which in this scenario would be all of the data. The 3Mb Auto lap
limit avoids this possible problem.
Notes about Auto lap limit
The internal channels Time and Space are not incremented by Auto lap limit
The LAP counter is not incremented by Auto lap limit
The ABS lap counter does increment at the Auto lap limit
The LAPTIM message records the time from logger on to the previous Auto lap limit
Auto lap limit is applied to Local disk as well as flash card memory.
The size of the auto lap limit is a compromise between ensuring that the Auto lap limit does not interfere with the
normal lap beacon > lap beacon events and possible data loss resulting from use without a beacon.
The maximum data throughput of the Shark at 40,000 bytes per second (typical value) means that at maximum
acquisition rate the 3Mb (3,000,000 bytes) / 40,000 = 75 seconds (approx) between each Auto lap limit. At maximum
acquisition throughput this would conflict with any normal lap of less than 1:15
data view_std_manual v1.4.doc Digitek Spa Digitek Spa