Measurement procedures in the field

Battery and memory management

When leaving the SunScan probe to Autolog over a few days, the memory space on the Flashcard will determine how long it can run for, provided the Workabout Ni-Cd battery is fully charged, and the probe alkaline batteries are not near the end of their life. Approximate indications of data memory requirements are given in the earlier Data memory management section.

Warning! If you leave the Workabout in the field for Autologging, you must enclose it in a bag or container with plenty of desiccant to protect it from the possibility of internal condensation. If you are using the Beam Fraction sensor as well during the Autolog process, bear in mind that the shade ring may need occasional readjustment.

Of course it is worth checking the equipment a day or two before your field experiment for routine matters such as the state of the batteries and the internal desiccant. See the Technical Reference section for details of these.

Probe handling in the field

Earlier sections in the SunScan User Manual (Measurement options and experiment design) give you guidance as to what equipment you will need (BFS or not) and what types of measurement you will make (LAI, PAR, or All). This section helps with practical comments and advice.

The probe GO button

The red button on the probe handle allows you to initiate and store repetitive readings from the probe without needing to look at the Workabout display. Listen for the tones from the Workabout which tell you where you are in the process:

•single beep - initiate READ

•double beep - accept STORE

The GO button functions just like the Enter button on the Workabout, for all menu options that are presented at the bottom of the screen.

Levelling the probe

The probe is fitted with a miniature bubble level to help you hold it level during the measurements.

In most situations beneath the canopy, exact levelling of the probe is not critical.

Do your best to minimise your own shading of the probe when taking readings. If the probe can "see" you, you will be blocking a certain amount of diffuse light from the sky. Casting a dense shadow on the probe by blocking the direct beam could cause significant errors.

Your best strategy will be to take as many samples as quickly as you can rather than aim for perfection with each reading. This will counter the spatial variability of most canopies, and is especially true if you have to work in unsteady light conditions.

When using the GO button, concentrate on getting the best levelling for the READ function (single beep) which then "freezes" the reading. It does not matter whether the probe is level when you press GO the second time to store the reading.

48 • Measurement options

Document code: SS1-UM-1.05

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Delta Electronics SS1-UM-1.05 Measurement procedures in the field, Probe handling in the field

Models: SS1-UM-1.05