thank you with for your awesome detailed breakdown really appreciate it
what would you recommend to test the modulation signal?
Steps to Test PWM Signal with an Oscilloscope
Equipment Needed:
1. Oscilloscope: A device to visualize electrical signals.
2. Probes: To connect the oscilloscope to the circuit.
3. Power Supply: Ensure you have a stable 24V power supply for the laser module.
4. PWM Generator (if applicable): If you need to generate the PWM signal externally.
Procedure:
1. Setup Connections:
• Power Supply: Connect the 24V power supply to the appropriate V+ and GND pins on the laser module.
• PWM Signal: Connect the PWM signal wire (likely the ‘M’ pin based on your previous thoughts) from the laser module to the PWM output of your controller or PWM generator.
2. Connect Oscilloscope:
• Ground: Connect the ground clip of the oscilloscope probe to the ground of your circuit (common GND with the power supply).
• Signal Probe: Connect the probe tip to the PWM signal line. This is the line that sends the modulation signal to the laser.
3. Configure Oscilloscope:
• Voltage Scale: Set the voltage scale to an appropriate range (e.g., 5V/div if your PWM signal is 0-5V).
• Time Base: Set the time base to view several cycles of the PWM signal (e.g., 1 ms/div).
4. Observe PWM Signal:
• Signal Shape: You should see a square wave on the oscilloscope display. The high portion represents the ON state, and the low portion represents the OFF state.
• Frequency: Measure the frequency of the PWM signal by counting the number of cycles per division on the time scale.
• Duty Cycle: Measure the duty cycle by comparing the high time (ON state) to the total period of the PWM signal. Most oscilloscopes have a feature to calculate this automatically.
5. Adjust and Verify:
• Adjust PWM: If using a PWM generator, adjust the duty cycle and frequency to match the laser’s requirements.
• Verify Output: Ensure the duty cycle changes as expected when you adjust the PWM settings.
Example of Using an Oscilloscope:
• Connect Probe: Clip the ground lead to the ground of your power supply and touch the probe tip to the PWM signal line.
• View Signal: Look at the oscilloscope screen. You should see a series of pulses (square waves).
• Measure: Use the oscilloscope’s measurement functions to measure the frequency and duty cycle.
thank you Simon
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