On your Ruida controller the pwm output is labeled as ‘LPWM1’ for laser 1.
It is a pwm digital output, so a voltmeter will display the RMS value or basically an average of what it’s reading. Same thing happens with a mA meter, you will be reading only the RMS value of the current.
You can just measure from ground to LPWM1 and if it’s set for 50% you should read 50% of the ‘swing’, if it’s a 5v like the Ruida, you should get about 2.5 volts…
Make sense?
Your laser cannot ‘lase’ at 50%, it is either on or off. Power control is really an illusion as it’s really ‘power/time’. Your only real control is speed…
Also identifies why it’s a good idea to setup your lps properly.
I have a permanent ‘connection’ for my scopes trigger hanging off LPWM1.
This is true if you are reading it during a ‘pulse’. If you are running a layer, other configuration information is used to determine the actual pwm.
