Check Hold Off; Check For Bullseye - NORTHROP GRUMMAN Iklwa II TEM00 Service Manual

Check Hold Off

Check for Bullseye

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1. Turn the chiller on.
2. Ensure that the TEC is at the temperature specified on the test data sheet.
3. Set the Q Switch to parameters specified on the test data sheet.
4. Open the shutter.
5. Gradually increase the current from 0A until green light is visible. Do not
exceed the operating current on the test data sheet.
Checking "Hold-off" is a technique needed to verify proper operation of the laser.
To check hold off, perform the following steps:
1. Turn on the laser and run for at least 20 minutes.
2. Lower the operating current to 10 A.
3. Ensure that the RF driver signal is at maximum power with no triggers or
gates.
4. Observe the beam output on the power meter while turning up the current to
the operational value. "Hold-off" condition is met when no green light is
visible.
5. If green light is observed, the laser does not hold off refer to
switch "Hold-off".
6. Reduce the current to 10 A.
7. Return the Q-switch controller to the normal operating settings.
8. Gradually increase the current to the full operational current.
1. Adjust current to just above threshold.
2. Place a white card in the beam path in front of negative lens or observe the
beam on the power detector head surface.
3. The bullseye image is shown in Figure 3-2 below. The outer ring of the
bullseye should be concentric to the main beam.
Chapter 3: Tuning and Testing Procedures
40 Patara II and Iklwa II Service Manual
Align for Q-