opti-sciences OS1p - Page 169

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qI = ((Fm-Fmt) / Fm-Fms)) Relaxation of qI starts at about forty minutes and can take up
to sixty hours. qI 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 m
emory almost unlimited testing
Digital Output
USB, MMC/SD data card with up to 1 GByte data card size