I am creating a statistic on the swell pedals calibration values of the Physis organs.

Can you help me?

It is very simple: you have to enter the service menu and perform a swell pedals calibration procedure, in order to read the "min" and "max" values of each pedal, and then write them here.

Please note that "min" values may start from numbers higher than one, and max values around 127.

Thank you if you can help me (and in any case a pedal calibration is always useful!)

It's very simple:

press the four buttons at the same time: Value +; Value -; Enter; Exit.

You have now entered the service menu.

The first voice is "calibration"; press Enter.

Now, you simply have to move each single swell pedal towards the max position (and write the max value) and towards the min position (and write the min value)... very simple!

Thank you very much, you are very kind!

I needed to try to understand how the photoresistor calibration process takes place.

The swell pedals have a led and a photoresistor. In between these two elements is a guide with a plastic window that has a gradient transparency, from almost transparent (downwards) to almost opaque (upwards) that is connected to the swell pedal.
When the pedal moves, more or less light reaches the photoresistor depending on the position of the guide.
The LED that emits light also has a calibration trimmer, and I wanted to understand how it was calibrated.

Among the numbers you have indicated, I would say that the max position is the one that has less deviations of values, almost all the instruments have a max position 122 (mine too), while the min position is more variable.
The max value corresponds to the position in which the photocell receives the least light.

It is therefore probable (but I am not yet very sure) that the trimmer will be adjusted as follows:

1 Pedals in max position
2 Adjust the trimmer so that a value of 122 corresponds to this position.
In this way all the photoresistors of the various pedals receive the same amount of light in the max position (there may be mechanical mounting tolerances that require this calibration in the factory).

So it was just academic curiosity...

Zitat von Aeoline im Beitrag #11

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Zitat von ahlborn im Beitrag #10

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...The max value corresponds to the position in which the photocell receives the least light...

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That means, at min-position of the pedal the photoresistor receives the most light?

The min-values of my Unico are significant lower than of your Gloria. That means, my Unico produces a lower volume at the min-position?

The console of my Unico is creamy white - also inside. Yours is much darker. So my pedals receive more light because the brighter console.

That follows: brighter organ consoles produces lower volumes at min-position!



No magic! - just science!



VG
Aeoline

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