Download 21219977A

8. Data Management
The Data menu (Fig. 19) serves to manage the measurement data in internal storage and/or on the SD
memory card. You access this menu via the Data menu item in the main screen.
Fig. 19: Data menu
Shown at the right in the screen is the memory usage in bytes. The total free capacity of the data
memory is 3.5 MB. The following data and parameters for sampling are automatically stored in the
unit’s memory, individually for each sampling filter:
Date, starting time and duration of measurement
Unit model and serial number
Mean mass concentration of the measured particulate matter fraction in µg/m³
% of the maximum pump motor speed
Outside air pressure
Outside air temperature
Photometer temperature
Relative humidity
Any reportable events and errors
A data record that comprises the information listed above will require 128 bytes. As a consequence,
about 27,000 data records can be placed in storage. The system uses a non-volatile ring memory. The
data are retained even if the device is switched off. Once the memory is full, the oldest data is overwritten with the new data. Since overwriting works reliably only for a limited number of cycles, the memory
should be erased at regular intervals.
If an SD memory card is present in the device, then the data will also be automatically written as a text
file (CSV file format) on the SD memory card.
30
APM-2