Now Set the Display to PAR (Menu, Settings, Display, Enter)

The procedure for taking, displaying and storing a reading stays the same, but the reading display and the data stored change to reflect the new setting:

This screen is the same if you change the Display to All, but the stored data also includes readings from all 64 individual photodiodes.

Note: if you’re using a portable computer to control the SunScan, then the All setting will actually display the 64 (emulated) photodiode readings.

Without a Beam Fraction Sensor

Change the SunScan probe, Ext sensor to none. (Menu, Settings, SunScan probe, Enter)

The reading procedure is still the same two-step process (read, store, read, store...) without a Beam Fraction Sensor

-as long as you have the Display set to PAR or All. However, the screen displays only the average PAR reading from the SunScan probe and the spread of the photodiode readings.

Things get more complicated if you want to take Leaf Area Index readings without a Beam Fraction sensor. SunData still needs measurements of the Incident PAR and the Beam Fraction, so you have to make them using the SunScan probe itself. We’ll go into the details of this procedure later on, once you have got the SunScan probe connected.

Connecting the SunScan probe

By now you should have a reasonable familiarity with using the Workabout, and how the SunData menus work, so it is time to try taking some readings with the SunScan probe connected.

Plug the coiled serial cable from the probe into the RS232 connector at the top right of the Workabout.

Use Menu, Settings, Display, Enter, and set the display to PAR.

Use Menu, Settings, SunScan probe, Enter, to set the Data from: to SunScan probe.

For the moment, even if you have a BFS, set the Ext sensor: to none. Press Enter to accept these settings.

SunData should display a version number at the top of the opening screen. If you see Communications failed, you will need to recheck the connections.

If you don't get this far but get messages saying the serial port is in use, you must set the Remote link to off. Exit from the SunData program if necessary (+X). From the Psion System screen, press Menu, Spec, Remote link, Enter, and select Off. Then restart SunData.

Press Enter in the Next Reading screen.

SunScan User Manual v 1.05

SunScan Tutorial 21

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Delta Electronics SS1-UM-1.05 user manual Without a Beam Fraction Sensor, Connecting the SunScan probe

SS1-UM-1.05 specifications

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