- In this case the power level = DF(internal LPS) * DF(pwm-L) ;
- Both PWM’s control power. This means that the product of IN and L DF determines the power. The L in this case functions as an enable and part of the power control.
- There is no enable other than the PWM-L signal not being asserted [DF =0] .When no imaging is active the laser is off.
In this case the power level = PWM-IN
The enable is L. So I assume that this line is asserted for the entire time an image is being created. However, I have not measured such.
I think the IN was intended to be an analog control and the L is the digital on-off control.
As I understand it the original K40 only dithered so all that was needed was an intensity control pot and an on-off function.
When we replaced the NANO controller with Gcode control the debate about how to use the IN and the L arose. Actually, that is what prompted me (and a few others) to fully document the LPS design
It appears in the Ruda application the IN was chosen to control power with a PWM and the L as the enable.
In my experience controlling power only in the source imaging program ignores the need to adjust for tube changes. To each his own.
I wonder if all this dialog is getting us closer to finding this problem. 