User guide

Chelsea Technologies Group
FAST
tracka
User Guide HB179 Issue 7.0
Page
34
of
47
L. Logging mode to internal flashcard: Selecting this option will instruct the FAST
tracka
to
store all measured and calculated data to the internal flashcard for later retrieval. When
this option is selected and the instrument is not operated in AutoAcquire mode, the user
is prompted for a filename after selecting number of acquisitions, but immediately
before acquisition begins. When this option is selected and the instrument is operated
in AutoAcquire mode, the FAST
tracka
creates a filename automatically of the format
SDYHHMMSS (sequential day of the year, 24hr, 59 minute, 59 seconds).
M. The Upper Limit Threshold value ranges from 55-99. This value is used when in Auto
Ranging acquisition mode. For a current PMT gain of e.g. 16, a percentage is calculated
from your current running average and the running average max, if this value is greater
than the upperlimit threshold the PMT gain is automatically switched down in gain to a
PMT gain of 4.
N. The Lower Limit Threshold value ranges from 5-45. This value is used when in Auto
Ranging acquisition mode. For a current PMT gain of e.g. 16, a percentage is calculated
from your current running average and the running average max, if this value is less than
the lowerlimit threshold the PMT gain is automatically switched up in gain to a PMT gain
of 64.
5.3.8 Protocol Examples
The following sequences should aid the user in understanding the different acquisition actions
taken when different acquisition options are selected in the protocol.
The column on the left gives the pertinent aspects of an acquisition. The fields noted are
number of acquisitions (option 6), sequences per acquisition (option 7), enable channel A
(option J), and enable channel B (option K). The column on the right shows the resulting flash
sequences in the order generated, as well as the symbol “d”, which indicates when an
acquisition is complete, and the data is presented either to flashcard or analogue output.
Acquisition Options: Flash Sequence Result:
5,1,Yes, No............................................................AdAdAdAdAd
5,1,Yes,Yes............................................................AdBdAdBdAd
5,2,Yes,No.............................................................AAdAAdAAdAAdAAd
2,2,Yes,Yes............................................................AAdBBd