ACQUIRING DATA
iKon-L SECTION 5
Page 58
5.4.4.1 - Readout Mode & Fast Kinetics
The data from each of the spectra in the Fast Kinetics series is stored as an image. Select Image from the
Readout Mode drop down list on the Setup Acquisition Window. Fast kinetics is not available in multi-track
mode. With Fast Kinetics you may use the following Trigger Modes: Internal, External, Fast External and
External Start.
• In Internal mode, the system determines when the acquisition begins, and then uses the acquisition
settings defined by the user. This mode is equivalent to the internal triggering mode for Single Scan
etc.
• In External mode, a trigger pulse is required to start each scan in the series. The rising edge of the
trigger starts the exposure time. After the exposure time has elapsed, the number of rows, as
specified by the user, are vertically shifted. The system then waits for the next trigger to start the next
scan. As there is no keep clean cycle running while waiting for the external trigger the ‘real ‘exposure
time is the time between each trigger. A consequence of this is that if your experiment has a constant
background signal but your trigger period is not fixed you may see different background levels in your
signal.
• In External Start mode, data will not be acquired until the system receives an initial external trigger
signal from an external device, like a laser. From that point on, the system alone determines when
data are acquired based on the user settings, as in the case of Internal Trigger. As the system
changes from an external trigger mode to internal trigger mode on receipt of the initial trigger signal
the exposure time of the first scan in the series will not be the same as the subsequent scans. The
exposure time is defined as the time between vertical shifts.
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