Field Scout CM 1000, Руководство по эксплуатации продукта

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9
Taking Readings
When the meter is on, pressing the trigger on the front of
the handle will activate the targeting lasers and will cause
the
measuring and calculating mechanism to become
“Live”. That is, while pulling the trigger, the user can see
the NDVI
value (see below) being constantly updated as
the targeting lasers are moved around the leaf surface.
Releasing the trigger locks in the
NDVI
reading and
incorporates that reading into the running average and the
logger’s memory.
NOTE: Readings should be taken only on individual
leaves. Canopy-level measurements are encouraged only
for fine-textured turf grass. (See Light Management, p.
17)
When in normal reading mode, the LCD of the CM1000
NDVI meter will display the NDVI value, the brightness
reading from the ambient light sensor, a running average
and indicate whether the data logger is functioning. The
contents of the LCD are explained below.
NDVI
The CM 1000 NDVI reading is reported on a scale of –1
to 1. The
NDVI
value is a measure of the relative
greenness of the leaf. It is calculated as [(%Near
Infrared-%Red) / (%Near In % Red)]. This value
remains in the meter’s short-term memory until it is
deleted or the meter is shut off (see Keypad Operation, p.
7). If the data logger is enabled the
NDVI
value is also
recorded in the logger’s memory.
Normal Reading Mode