Chapter 4. Using Special Features
Model PM880 Portable Hygrometer User’s Manual 53
4.6 Using Automatic Calibration (AutoCal) (cont.)
4. If necessary, use the arrow keys to move to the AutoCal Interval text
box.
5. Press [ENTER] to open the text box. Use the numeric keys to enter the
desired value (in minutes) and press
[ENTER].
Note: GE recommends setting the Autocal interval to 8 hours (480
minutes).
The next time AutoCal occurs will depend on the length of the time interval
that was selected. See the example below.
EXAMPLE:
The PM880 establishes a fixed schedule, beginning at midnight, using the
interval specified to determine the times of subsequent AutoCals. If you
enter an 8 hour time interval, AutoCal will occur 3 times per day (1 day =
1440 minutes/480 minutes = 3). The fixed schedule will be as follows:
1. 8:00 a.m.
2. 4:00 p.m.
3. 12:00 a.m. (midnight)
If you set the 8 hour AutoCal interval at 8:10 a.m., the next AutoCal will
occur at 4:00 p.m. (excluding the AutoCal performed when first leaving the
System Configuration window).
Next, do one of the following:
• Use the arrow keys to move to another text box and enter additional
data.
• To exit and return to taking measurements, press [F3] (OK) and then
[MENU].
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