CHAPTER 7 THE MODE-MENU
meant to be turned on for extended periods of time, as this may lead
to excessive internal heating. Therefore, the illumination periods are
restricted (see menu point 14: ACT-WIDTH). There is a blinking
sign (ACT) in the upper left corner while actinic illumination is on.
On/off switch of the internal actinic light
source, with additional application of a
saturation light pulse for YIELD-assessment at the end of the
illumination time which is set by menu point 14: ACT-WIDTH.
There is a blinking sign (A+Y) in the upper left corner of the display
while actinic illumination with terminal YIELD-determination is
running. This function can be also directly started from standard
position 1 by double key operation ON + START.
13: ACT+YIELD: OFF(SET)
F: 448 745Y 6.2E 20L
Setting of actinic illumination time. The
setting can be modified via SET and the
arrow-keys in 10 s steps. Maximal setting is limited to 5 min (5:00)
in order to avoid excessive internal heating.
14:ACT-WIDTH 0:30 (SET)
F: 448 745Y 6.2E 20L
Setting of intensity of internal actinic light
source (halogen lamp). The setting can be
modified via SET and the arrow-keys between 0 and 12. The range
covered by intensities 1-12 can be shifted up and down with the help
of AL-FACT (menu point 16).
15: ACT-INT: 5 (SET)
F: 448 745Y 6.2E 20L
Actinic light factor by which the range of
actinic intensities (ACT-INT, menu point
15) can be shifted up and down. The standard factor of 1.00 can be
modified between 0.5 and 1.5 via SET and the arrow keys. The
relationship between AL-FACT and PAR is non-linear.
16: AL-FACT: 1.00 (SET)
F: 448 745Y 6.2E 20L
When switched on via SET, first the
maximal YIELD in the absence of actinic
light (Fv/Fm) is measured and then a series of 8 consecutive YIELD-
measurements at increasing light intensities is started. This function
17:LIGHT CURVE:OFF(SET)
F: 448 745Y 6.2E 20L
20
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