GentleLASE PRO HVPS Verification Procedure
WARNING – SHOCK HAZARD!!!
The high voltage capacitor in the GentleLASE PRO laser retains LETHAL voltages and must be safely discharged, before working near the laser head or inside the HV section for any reason. This procedure must be performed only by those technicians who are familiar with the precautions required when working with high voltage specific to the GL PRO laser system, and those who have been trained on the GL PRO laser system and its particular hazards.
Residual voltages require stick discharging if access to the head or high voltage sections are necessary. This must be done using the discharge stick located in the HV section. Discharge all 3 capacitor terminals for several seconds each. Verify that the capacitor is discharged below 25 VDC using a DVM and a high voltage probe.
During HVPS testing it is possible that some laser light will exit the fiber receptacle. Therefore, Be sure to place a beam blocker at the output of the receptacle.
WARNING – LASER LIGHT!!!
During this procedure it is possible that the laser may perform a bleeder pulse, emitting laser radiation. Therefore safety eyewear must be worn at all times during these procedures. The eyewear must have an optical density of ≥ 5.8 at 745 – 765 NM for the Alex Head.
HVPS CALIBRATION PROCEDURE:
- Remove the fiber/delivery system cables, if installed.
- Remove left and right side panels, top cover, and HV plastic shield and set aside.
- Turn laser on, allow for normal warm up. NOTE: Put on safety eyewear and leave eyewear on throughout this procedure.
- Verify that the capacitor is fully discharged on all terminals E3, E4, E5 (<25 VDC).
- HV PCB Test: Measure the signal voltages by connecting the DVM Leads to the HV Daughter PCB at the test points indicated in the chart below for each signal voltage to verify the voltages are correct.
- Verify the HVPS output connector is connected to the high voltage power supply. Set up the 1000:1 red HV probe and DVM to measure the voltage on terminal E3/E4 of the PFN capacitor and secure the probe ground to the chassis.
- Enter MM and Laser CNTL screen, select 3ms PW, and 1Hz rep rate. Select the HVRef button and adjust the high voltage setting for HVRef = 300V.
- CAUTION: Eyewear must be worn whenever the laser power is on.
- Go to “Ready”. Verify that the DVM reads 0.300 VDC (300V) ± 0.008 VDC (0.292 – 0.308 VDC) on terminal E3/E4.
- HV Section Test: On the Laser CNTL screen select the HVRef button and adjust the high voltage setting for Voltage = 1200V. DO NOT PULSE THE LASER AT THIS VOLTAGE SETTING IT WILL DAMAGE THE LASER.
- Go to “Ready” and measure the voltage on the red high voltage probe and DVM to verify voltage is 1.250 VDC (1250 V) ± 0.025 VDC (1225 to 1275 VDC). NOTE: System will not stay in Ready, (delivery system removed) but the voltages can still be measured and verified.
- Verify that the Sample voltage on the Laser CNTL screen is 1250 VDC ± 25 VDC or between 1225 and 1275 VDC.
- Go to “Standby” and then turn the laser off. Hold the Discharge Stick on each terminal for 30 – 40 seconds to properly discharge the capacitor voltage. Firmly place the discharge stick on the terminals E3, E4, E5 and “hold it there” for 30 – 40 seconds before moving to the next terminal. Do not lightly touch the terminal to cause sparks that bridge the discharge stick and the terminals.
- Verify there is no voltage on all capacitor terminals E3, E4 and E5 and then remove the HV probe.
- Install the HV plastic shield.
- Install left and right side panels and the top cover and complete all system calibrations and Performance and Usage “After Data” requirements.
- It may be necessary to verify the HVPS serial number and pulse counts in the System Info screen, if the HVPS has been replaced.