YSI Data Scout - Manual (Page 14)

Level or Set Fixed Offset button (Figure 3.13) located on the Live tab performs these adjustments on the Level Scout transducers. Once
the Re-Zero Transducer window is open, one of two options must be selected prior to proceeding (Figure 3.14).
If a vented transducer simply needs to be adjusted for zero drift and the transducer is not yet installed under water, select the “Not
Submerged” option and acknowledge the choice with the OK button. Do not perform this function if using an Absolute Level Scout.
Absolute Level Scouts should read atmospheric pressure in air, not zero.
If the transducer needs to be adjusted to a known value, select the “is Submerged” option. When the selected option is changed, a data
field will appear allowing direct entry of a corrected value in the currently selected unit of measure. Acknowledge the change by
clicking the OK button; the transducer will adjust its offset to indicate the new value (Figure 3.15). Note: if entering a TOC offset, be
sure the Level Scout is deployed prior to entering the offset.
After performing either of these operations the ‘Information’ window will re-appear with the adjusted pressure data. At this time, the
user can verify the pressure value to ensure it has been corrected.
Figure 3.13
Figure 3.14 Figure 3.15
3.2.5 VIEW OR SET SCAN AVERAGE TIME
Click the View or Set Scan Average Time button (Figure 3.16) to open the ‘Change Average Time/Samples’ window (Figure 3.17). This
window displays two text boxes; however, you can only edit the box labeled “Select Scan Average Time of Transducer”. The lower
window reflects how many measurements the Level Scout will make and average per live reading or logged data point. To set this
control, simple enter the desired ‘Scan Average Time’ in the top box and click OK. You may enter in fraction of seconds up to 24.0
seconds.
Setting the top box to ‘0’ will yield the most precise data; this is because the instrument will not average any scans, it simply conducts
and logs a single scan. Notice the box warning about setting a time greater than two seconds, this reflects the tendency for each logged
datum to become slightly less precise as increasingly more data points are averaged. However, setting the average time higher will take
up less internal memory as the instrument only logs one averaged point during that time span.
Figure 3.16
YSI Incorporated Data Scout 14