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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
R&S Business Unit Automotive 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 4.3 – Manual download / Manual system (Cobra & Shark – Direct cable download) In this mode you should have the following system configurations. • Capture / Acquisition files / Options – Set to Manual System • Capture / Setup Acquisitions – Auto download switched OFF DATAVIEW Pg. 35/133 Press the E button on the upper tool bar to display the following window. You are given the opportunity to make any adjustments to the data you have already entered. Press Next to continue Ensure that you have selected the correct Car from the pull down menu. The Connection shown at the bottom of this window will indicate if the correct device is available on the network Press Auto to use the default download directory and create a unique file name. File names for car_1 will end in C0, car_2 will end in C1, car_3 will end in C2, car_4 will end in C3. Each new download using this file name will create a new run number that is attached to the end of the file name as _RUN0x You are completely free to type in your own file name and use an alternative data directory. Press Start to establish communication with the logger. Correct communication is shown by the bottom left of the screen stating ‘fast Ethernet download enabled and the E button on the tool bar will turn red. To view the data in the logger memory, select Capture / data logger manager / select laps, or press this button on the toolbar. Highlight the laps (data) you want to download and then press the <strong>Download</strong> button. Multiple laps can be downloaded using the CTRL or arrow keys in the normal Windows way. At the end of download your last lap of data will be automatically loaded into the data header bar at the top of the screen. data view_std_manual v1.4.doc Digitek Spa Digitek Spa
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