Casella CEL CEL-160 - Manual (Page 17)

are more pronounced and it is then important
to realise that the actual signal may not have
followed the course of the straight line
between the points; an obvious example is
when either side of a peak is sampled. It is
also necessary to ensure that the signal does
not contain significant frequencies above the
specified upper limiting frequency as these
take on an `alias' and look like lower ones.
Slight discontinuities will be noticed in
the pre-trigger part of the trace and also at the
trigger point. This manifests itself as 10 µS
gaps at 4 mS intervals and is due to house-
keeping functions of the microprocessor,
these effects are only slight and are limited to
the pre-trigger data only with the main trace
being reproduced in full.
Figure 10: General block diagram for the CEL160 series
CEL-160 Graphic Recorder - Page 17