
Touchscreen Operation
Chapter 7
75
ETR-Factor
7.3.1.5
This factor is used for ETR calculations and corresponds to the
fraction of incident PAR absorbed by a leaf; its default value is
0.84 (cf. Section 5.3, page 38).
Fo’ Mode
7.3.1.6
The “Fo’ Mode” replaces after saturation pulses actinic by far red
light to quickly open PS II reaction centers (cf. Section 5.1.2,
page 32). The measured F
0
’ is the minimum Ft during far red il-
lumination. Interval and intensity of far red illumination can be ad-
justed in menu “Light Sources” (Fig. 41, page 77).
Adjust F-Offset
7.3.1.7
The “Adjust F-Offset” command determines the background sig-
nal for subtraction from the total signal. Background signals must
possess the modulation characteristics of measuring light to be
recognized by a PAM fluorometer. These signals can arise from:
•
Fluorescence from suspension media or detector filter excited
by measuring light.
•
Traces of modulated excitation light transmitted by the detec-
tor filter.
•
Non-optical modulated "electronic noise".
Usually, the background signal increases with measuring light in-
tensity and signal amplification (gain). Therefore, the Adjust F-
Offset command determines the background signal for all meas-
uring light intensities and all gain settings. The currently active
Содержание MINI-PAM-II
Страница 2: ......
Страница 12: ......
Страница 104: ...Chapter 7 Touchscreen Operation 98 Fig 63 MINI PAM II Memory and Info menus...
Страница 122: ......