Spectrum Brands MC.31XX - Manual (Page 80)

80 MC.31xx Manual
Trigger modes Option Gated Sampling
the number of acquired samples will be less than the gate signal length. See table on the next page for further explanation.
End of gate alignement
Due to the structure of the on-board memory there is an-
other delay at the end of the gate interval.
Internally a gate-end signal can only be recognized at
an eight samples alignment. This alignement is a sum of
all channels that are activated together. Please refer to
the following chapter to see the alignement for each
channel and mode combination.
So depending on what time your external gate signal
will leave the programmed gate condition it might hap-
pen that at maximum seven more samples are recorded,
before the board pauses (see figure).
The figure on the right is showing this end delay exem-
plarily for three possible gate signals. As all samples are
counted from zero. The eight samples alignment in the
upper two cases is reached at the end of sample 39,
which is therefore the 40th sample.
Alignement samples per channel
As described above there’s an alignement at the end of the gate signal. The alignement depends on the used mode (standard or FIFO) and
the selected channels. Please refer to this table to see how many samples per channel of alignement one gets.
Module 0 Module 1
0 1 2 3 0 1 2 3 Mode Alignement
X Standard/FIFO 8 samples
X X Standard 8 samples
X X FIFO 4 samples
X X Standard/FIFO 4 samples
X X X X Standard 4 samples
X X X X FIFO 2 samples
X X X X Standard/FIFO 2 samples
X X X X X X X X Standard 2 samples
X X X X X X X X FIFO 1 sample