Campbell CR800 Especificaciones descargar pdf (Pagina 70)

Section 2. Data Storage and Retrieval

resolution, and requires half the memory space as IEEE 4 byte floating point (2

bytes per value vs 4).

TABLE 2.2-2. Resolution and Range Limits of FP2 Data

Zero Minimum Magnitude Maximum Magnitude

0.000 ±0.001 ±7999.

The resolution of FP2 is reduced to 3 significant digits when the first (left

most) digit is 8 or greater (Table 2.2-2). Thus, it may be necessary to use

IEEE4 output or an offset to maintain the desired resolution of a measurement.

For example, if water level is to be measured and output to the nearest 0.01

foot, the level must be less than 80 feet for low-resolution output to display the

0.01-foot increment. If the water level is expected to range from 50 to 90 feet

the data could either be output in high resolution or could be offset by 20 feet

(transforming the range to 30 to 70 feet).

TABLE 2.2-3 FP2 Decimal Location

Absolute Value Decimal Location

0 - 7.999 X.XXX

8 - 79.99 XX.XX

80 - 799.9 XXX.X

800 - 7999. XXXX.

2.3 Data Collection

Data can be transferred into a computer via a communications link using one

of Campbell Scientific’s datalogger support software packages (e.g., PC200,

PC400, LoggerNet).

2.3.1 Via a Communications Link

See the manual and help for the software package you are using.

2.4 Data Format on Computer

The format of the file stored on disk can be either ASCII or Binary depending

on the file type selected in the computer software used to collect the data

(PC200, PC400, LoggerNet).

2.4.1 Header Information

Every data file stored on disk has an ASCII header at the beginning. The

header gives information on the format, datalogger and program used to collect

the data. Figure 2.4.1 is a sample header where the text in the header is a

generic name for the information contained in the header. The entries are

described following the figure.

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Campbell CR800 Especificaciones Pagina 70