YSI Data Scout Advanced - Manual (Page 47)

The Scan tab accepts a relative time Period (in days, hours, minutes, and seconds, between the starts of each scan) and a Scan Type
selection for a test (figure 4.24). The most common Scan Type is Linear, meaning that the scans are evenly spaced in time at a fixed
constant period. The period has a days field that can be specified as 0-99 days. The seconds field of the period may have a fractional
part allowing it to vary from 0 to 59.99 seconds. The minimum period that can be specified between scans is 0_0:0:0.01 (1/100th of a
second) but using such a short period will seriously limit the life of the battery and the total test time, as the finite memory will also be
used up very fast.
Figure 4.24
For the Logarithmic scan type, the period starts small (0_0:0:0.01) and logarithmically lengthens until it reaches the final terminal scan
period specified after which the period remains constant at this terminal value until the test ends (figure 4.25).
Figure 4.25
Figure 4.26
Figure 4.27
For the Linear-Averaged scan type, the extra Average Count entry field limits the number of scans actually logged, while acquiring data
at the specified higher period but only logging less-frequent single scans containing the averaged values up to that point (figure 4.26).
For the Event-Based scan type, data scans are acquired at the specified period, but logging occurs only when a particular specified
datum (pressure or temperature) changes by the specified relative (delta) amount or by default after the specified number of scans (in
the Default # Scans field) has occurred without a preceding delta change (figure 4.27).
YSI Incorporated Data Scout Advanced 43