Crystal DataLoggerXP - Manual (Page 13)

Page 0 • DataLogger
XP
User’s Manual
Each logging type has a different storage requirement. The chart below provides the memory
consumed per data point for each logging type:
LOGGING.TyPE ByTES.PER.DATA.POINT
ACTUAL OR AVERAGE 3
AVERAGE WITH PEAKS 9
ON DEMAND 7
The third factor, the pressure dynamic, can significantly impact the maximum number of readings
recorded. The gauge employs a data compression mechanism to store a greater number of data
points. The mechanism compares the current data point with the prior data point and only stores
the difference between the two. This difference in pressure between the current and prior read-
ing is the pressure dynamic. When the pressure dynamic is small, the difference is small, and less
space is required to store the reading. Depending on the pressure dynamic of the input pressure,
the gauge may only require 60% to 75% of the memory as compared to the requirements listed
above for the same number of readings, allowing the remaining memory to be used for additional
readings. However, the memory savings is application dependent, and should be tested in the
actual application before assuming any increase in the maximum number of readings.
„ Data.Management
DOwNLOADING
To download data from the gauge, simply click the Download button after connecting to the
gauge. Depending on the number of readings, it can take up to 15 seconds to download all the
data. Once the data has been downloaded, the View and Save buttons will be available.
VIEwING
Clicking on the View button from the Main Window will bring up the View dialog box. In this dialog
box, you can choose to select the data to display, as well as include or exclude events from the dis-
play. Events are non-data readings, such as tare values, low battery indications, or logging param-
eters. To save data from this window, simply click the Save button to open the Save dialog box.