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Maintain Chiller
Check Hold Off
© 2018 Cutting Edge Optronics, Inc.
Desiccant supplies can be purchased from Northrop Grumman, or directly from
AGM Container Controls, Inc., telephone number 800-995-5590.
Desiccant cartridge NG CEO part no. 42-228
Refill part number 643665
Refill tool 980412
No cartridge installation tool is needed. The 40 gram desiccant cartridge is hand
tightened.
WARNING
. Do not operate the laser without a functional desiccant cartridge.
Condensation on the diode arrays or other optics can seriously damage the laser and
may void warranty.
The 5 µm filter and coolant in the chiller should be replaced a minimum of
monthly. Comply with the chiller manufacturer's recommendation if more
frequent. Drain and refill the chiller per the chiller and coolant manufacturer's
instructions.
The filter used is a Hydronix pleated 5µm polyester filter, part number SPC-25-
1005, available at multiple online retailers.
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 pump current to 10 A.
3. Set the Q-Switch internal trigger (or external gate) mode to external trigger
mode in the Channel Menu on the eDrive. Ensure there is no input to the
external gate BNC on the rear panel of the eDrive.
4. Gradually increase the current to the full operation current level.
5. Observe the beam output on the power meter. Hold off condition is met when
no green light is visible.
6. If green is observed, the laser does not hold off and may need internal repair.
7. Reduce the current to 10 A.
8. Return the eDrive to internal trigger (or external gate) mode.
43
Chapter Five: Maintenance
Patara I and II Laser User Manual
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