Products > Test Equipment
SDG2042X signal generator; screen brightness
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tv84:
The only thing that comes to mind would be to XOR the values of 2 keys (3 or whatever). Or OR the values, or AND.

As such, you could try to send all the 256 combinations as <value>.

If this theory is correct, then the number of combinations of consecutive presses can be much lower than previously thought...

Just an idea...
bdunham7:
Have you updated the firmware since you made the adjustment?  Possibly the brightness adjustment function simply doesn't exist in newer firmware.
xpsion:
my model had calibration document dated dec 6th 2016  so it was V2.01.01.17R5  , and that is the one i use now to eliminate that option
tv84:
Thinking loud about this...

Doesn't the key+LCD board contain a controller? If so, the key combination could be intersected within this board and never reach the mainboard (as long as it had some graphics overlay feature...).
xpsion:
Aha ! ,that could explain the weird key combination, as the normal cpu board does not use  multiple key commands....
Do you know which type of controller this is ?
Then i could investigate its pwm output.
I assume the main board just gives a base command to this controller to switch on the backlight, and then a pwm output on this controller is modulating the brightness level of the backlight.
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