169
q
I
= ((Fm-Fmt) / Fm-Fms)) Relaxation of q
I
starts at about forty minutes and can take up
to sixty hours. q
I
can be determined from the dark adapted Fm measurement and the
saturation pulse after 20 minutes used for q
T
. (Values can be changed in Excel).
Fod (or Fo’) q
P
, q
N
, NPQ, q
E
, q
T
, q
I
,
PAR, Leaf temperature, estimated ETR (using Standard PAR Clip).
Light Sources
Saturation pulse: White light LED with 690 nm short pass filter. Adjustable 0 ~ 11,000
uE, or 0-6600 uE with a PAR Clip
Modulated light: 660 nm LED with 690 nm short pass filter. Adjustable 0 ~ 1
:
E
Actinic illumination: White light solid state source. Adjustable 0~ 1500
:
E
Far red: 735 nm LED with far-red cut off filter (Fod or Fo’ determination, and for re-
oxidizing PSII before Fv/Fm measurements). Intensity and duration adjustable.
Detector and Filters
A PIN photodiode with a 700 ~ 750 nm band pass filter.
Modulation frequency
Selectable from 25 Hz to 1 MHz with auto switching based on phase of test.
Filter constants
Automated from 1
:
s to 1 S with auto switching based on phase of test.
Sampling Rate
Variable from 1 to 1,000,000 points per second with auto switching based on phase of
test.
Test Duration
Adjustable from 2 seconds ~ 10 hours (Longer with adapter and AC source).
Processor
ARM 7
Storage Capacity
1 GByte Flash memory almost unlimited testing
Digital Output
USB, MMC/SD data card with up to 1 GByte data card size
