Y(II)/ETR Meter

FV/FM Meter

Measured parameters:

Y(II): Quantum Photosynthetic Yield of PS(II)

ETR: Electron transport rate

PAR: Photosynthetically active radiation

T: Leaf temperature

FMS (or FM’): Maximum fluorescence at steady state

FS (or F): Fluorescence under steady state

Loriaux 2013 correction of ETR and FM’

α: Leaf absorptance & transmittance

RH: Relative humidity 5% to 95% (+/-2% over the range

Measured parameters:

FV/FM: Maximum potential quantum efficiency of PSII

FV/FO: A normalised ratio used to improve stress detection

Fo: Fluorescence after dark adaption

Fm: Maximum fluorescence during a saturating pulse

following a period of dark adaption

Ft: Instantaneous fluorescence

SPECIFICATIONS

Y(II)/ETR Meter

FV/FM Meter

Saturation pulse

7,000μmol white LED

6,000μmol red LED

Modulated light

Actinic light source: Ambient light only

Red 660nm LED with 690nm short pass filter

Detection method

Detector & Filters Sampling Rate

Multi-Flash Fm’ correction for all light adapted protocols & quenching: May be turned off

Pulse amplitude modulation method

PIN photodiode with 700~750nm bandpass filter

Auto-switching from 1 to 10,000 points per second, depending on test type and phase

Automated routine to optimally set the modulated light intensity. The modulated light may also be set manually

Test Duration

May be run for months in monitor mode

About 3 seconds for fast tests and

Special Algorithms:

and Fm’ eliminating saturation pulse NPQ as an issue

8 point rolling 25 ms average to determine Fm

Storage Capacity

2Gb non-volatile flash memory, supporting almost unlimited data sets

Output

By USB. Comma delineated (.csv) files, all parameters labelled and organised into columns

User Interface

Menu driven with arrows

Display

Graphic black and white display 132 x 32 pixels

Power Supply

8 hour USB lithium ion battery supplied as standard.

Mains current may also be used. Mains plug and charger supplied as standard

Dimensions

23cm long with a USB cable that is 160cm long

Hard shell case: 36 x 28 x 15mm

Weight

Meters with battery & USB cable: 0.45kg

Complete with case & accessories: 1.5kg

Absorptance measuring standard

2 included