13
running average (
AVG
) and the sample number (
N
) is
incremented. The current
AVG
and
N
are both displayed
on the bottom line of the LCD.
Although
N
can increment up to 250, only a maximum of
64
INDEX
readings (
N064
) can be used to generate the
running
AVG
. If more than 64 readings are taken before
the short-term memory is cleared, the screen will display
AVG=- - -
. However, deleting an
INDEX
reading from
short-term memory (thus causing a new
AVG
to be
calculated) does not free up memory space for storing an
additional reading. In other words, the average is not
calculated if the trigger has been pressed more than 64
times without clearing the average (see Keypad Operation,
p. 10).
Valid index
readings can be taken beyond the maximum
N
value of 250. But
N
will not continue to increment unless
the entire current data series is cleared, resetting
N
to zero.
Logging Data
The data logger must be enabled in order to download
data to a PC. In the Field Scout software, clicking a
button entitled
Meter Settings
will display a screen that
has
Enable Meter’s Logging Function
as an option. The
box associated with this option must be checked in order
to log and download data. Files downloaded from the
TCM 500 meter are comma-delimited text files and can be
opened in any word processing, spreadsheet, graphing, or
statistical analysis program.
There are six columns in the downloaded text file. If GPS
is used,
longitude
and
latitude
are in the first two
columns. Otherwise, these 2 columns are empty. The
sample number
N
, the %
RED, %NIR,
and
NDVI
are in
the remaining columns (see Data Files, p. 17).
