Vaisala HMT330 - Manual (Page 70)

User's Guide _______________________________________________________________________
68 ___________________________________________________________________ M210566EN-K
NOTE From any view, even in the absence of an EXIT button, a four-second
press on the right-hand function button takes you directly to the basic
display.
Graphic History
The graphical display shows the data trend or min/max graph of the
selected quantities, one at a time. The graph is updated automatically
while measuring.
0705-210
Figure 44 Graphical Display
Trend graph: Shows you a curve of average values. Each value is a
calculated average over a period. See Table 11 below.
Max/min graph: Shows you the minimum and maximum values in a
form of curve. Each point shows the absolute minimum and maximum
observed during the time period represented by the data point. See Table
11 on page 68.
Table 11 Periods for Trend and Max/Min Calculations
Observation Period Period for Trend/Max/Min
Calculations (Resolution)
20 minutes 10 seconds
3 hours 90 seconds
1 day 12 minutes
10 days 2 hours
2 months 12 hours
1 year 3 days
4 year* 12 days
* The maximum logging period of the data logger module (available
when data logger module is installed)
Use the following functions in the graphical display:
- Press the NEXT button to change between the trend graph and
max/min graph for the quantities selected for display.
- Press the EXIT button to return to the basic display.
-
Press the ▼▲ arrow buttons to zoom in and out in the graph window.