User guide

Chelsea Technologies Group
FAST
tracka
User Guide HB179 Issue 7.0
Page
35
of
47
This above figure illustrates the actual timing of a flash sequence consisting of 100 saturation
flashes and 20 relaxation flashes. The entire operation, as pictured, requires only 450 µs for the
programmed protocol. The Saturation group should be contained within a 250 µs frame, and the
relaxation group may be stretched into the order of milliseconds if desired. The above protocol
was generated with the following parameters:
SFW = 4
SFC = 100
SID = 0
DFW = 4
DFC = 20
DID = 12
Although the above picture shows all the flashes compressed into an overall window of 500µs,
this protocol would be impractical for measuring actual samples. A more reasonable protocol
would set DFP to 61, giving 50µs delays between decay flashes.