Chelsea Technologies Group
tracka
User Guide HB179 Issue 7.0
7. Configuration Information: V0.2 software protected certain system parameters which
were unnecessarily available to V0.1 users, including Serial Number and some
calibration fields.
8. Shutdown Request: V0.2 software allows Main Menu option “X” to request an immediate
instrument shutdown directly from software.
9. Configuration Options: V0.2 software removes the access to certain configuration
parameters, and includes an option to check PMT calibration discretely.
10. Run Options: V1.0.0 software allows the user to acquire data in two modes Auto ranging
and Normal. In Auto ranging mode the instrument starts with a gain setting of 16, an
algorithm decides which PMT gain setting to use given the best readings. The algorithm
used is Running Average = 0.9 * Running Average + 0.1 * PMTmax. If after 10 iterations
of the algorithm, on a particular gain setting the running average is below the lower
threshold limit value e.g. 15%, then the gain will automatically increase to the next higher
gain. If the running average is above the upper threshold limit value of 90%, the gain will
automatically decrease to the next lower gain. The 100% number is based on the flash
duration, with a number of 8000 binary for each 1.1µs. The flash duration period in µs is
calculated from the instrument units by the following equation: Flash Duration = 1.1 + (X -
4) * 0.06) µs, where X is the flash duration in instrument units. The running average max
is calculated by using the following equation: Running Average Max. = (Flash Duration /
1.1) * 8000. The Inter Flash Delay has to be at least twice the Flash Duration. Therefore,
in auto ranging mode and normal mode if the user enters a value for Flash Duration that
is greater than half the Inter Flash delay, a suitable value for the Inter Flash duration is
calculated.
11. Adaptive Storage: The FastTracka has no way of knowing whether or not it is storing
useful data. The adaptive storage is an extension of the auto ranging. The idea is that, if
there is no meaningful data, instead of storing this to the flashcard, a null record is
stored. The definition of no meaningful data would be a signal lower than the user
entered lower signal limit on a gain range of 256.
12. Fast Download: The FastTracka can now download files to the PC at a baud rate of
57600 in binary or ASCII. This is achieved using an Xmodem protocol, the user must set
their terminal emulation application to accept files downloaded using the Xmodem
protocol for ASCII or binary files.
13. Flashcard Improvements: The FRRF file delete facility no longer corrupts the file storage
on the flashcard. There is a flashcard dump facility which will dump the whole contents or
part of the contents of the flashcard if required.
14. Pressure Sensor: The software has been modified to accept an input from a pressure
sensor.
15. Intel Flashcard Driver: The software now works with Intel and M-Systems flash cards, and
the file tables are stored on the flashcard not in NVRAM.
16. 8Hz Acquisition: Using 10 mS sleep time between acquisitions and 1 flash per
sequence, it is possible to achieve 8 acquisitions per second.
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