Gentec-EO MAESTRO - Manual (Page 93)

MAESTRO User’s Manual Revision 8.1 92
Step 3: Measure the energy level without the attenuator. To reduce random uncertainty, you should
average a number of shots. We recommend at least one hundred shots. This should reduce random
errors by a factor of 10. (Square root of “n” assuming Gaussian distribution).
Step 4: Install the attenuator. Without changing the laser settings, measure the energy level by
averaging the same number of shots. All laser settings must be the same as Step 3 (including beam size
and position on the detector).
Step 5: Repeat the first measurement (Step 3) to make sure that nothing changed during the procedure
to invalidate the calibration. A change larger than the uncertainty of your measurements means that
something in the laser or environment changed. You can add this to your ± uncertainty when you use the
attenuator or try to stabilize the laser and environment and begin again with Step 3.
The correction multiplier for the MAESTRO and an Oscilloscope will be given by:
attenuator with Reading
attenuator without Reading

f
T (No unit)
Now use this calibration factor in the correction menu for the “Attenuator/Diffuser” when using it at the
wavelength established in Step 1.