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laser_adjustments
Laser systems are typically already adjusted. Sometimes this is not the case (either they forgot or the tube and PSU was bought separately) so it's usually a good idea to double-check this.
For the 100W Reci W4 tube the output current of the DY13 laser PSU needs to be adjusted to 24-28mA. To achieve this do the following:
- Be cautious:
- Make sure to wear laser protection glasses when dealing with an open Lasersaur.
- Make yourself aware of high voltage circuitry and avoid contact.
- Measure the tube current at maximum power:
- Turn the laser PSU off and let it fully discharge a couple of minutes. Disconnect from power.
- Connect an amp-meter at the cathode side (the side where the laser beam exits). For this disconnect the thin, non-high-voltage wire and place the amp-meter in between the wire and the tube (Most DMMs will work since the tube drops the voltage way down).
- Make sure non of the connections can touch anything and power up the Lasersaur.
- Read amp-meter when lasing at 100% power.
- If current is not approximately 26mA proceed with adjustments.
- Adjusting the output current.
- Locate the trim-pot at the side of the laser PSU
- Adjust (with insulated screw driver) until you get the desired output current.
| 1 | 2 | 3 | 4 | 5 | 6 | |trim pot| | 5V| TH| TL| WP|GND| IN|
The DY13 laser PSU has various ways to control the output power. The logic is like this: TH and TL fire the laser. You can choose if a high signal or a low signal does this (you only use one of them). The voltage on IN optionally allows you to cap the output power. Typically 0-5V is mapped to 0-24mA by the factory. A disconnected IN also produces an output, typically about 9mA. The trim pot allows for adjustment of this mapping.
For the Lasersaur we modulate the laser intensity by PWM-pulsing on the TH pin and wiring the IN pin to the 5V pin. If the intensity is low and the laser cuts out at under 50% power it's most likely the IN is not connected to 5V.