Gentec-EO PC-Gentec-EO (for MAESTRO and INTEGRA) - Manual (Page 22)

PC-Gentec- EO User’s Manual Revision 5.0 21
Uncheck Anticipation to deactivate the power meter acceleration software that provides accelerated
response. By using advanced algorithms and known properties of the detector, this software allows the
PC-Gentec-EO to provide a very accurate power measurement a few seconds faster than the natural
response of a thermopile power detector. It accelerates the natural response by a factor of 5 to 10.
Turning off the anticipation will result in a slower response but will reduce the noise level and provide a
more stable measured value in a noisy environment.
Version 7 energy heads have been calibrated with and without the attenuator at a chosen wavelength.
When enabling the attenuator, only the wavelength at which it has been calibrated will be available in the
wavelength menu. Similarly photodiodes have been calibrated with and without the attenuator at
chosen wavelengths. When enabling the attenuator the PC-Gentec-EO will prompt the wavelength menu
because the available wavelengths with and without the attenuator are different.
A checkmark shows when the anticipation or attenuator is activated. It is a toggle switch - select it to
change between on and off. For the anticipation, the default is on and for the attenuator, the default is off.
4.3.4
Corrections
The user can apply a multiplier and an offset value to the detector reading. Correction factors are most
useful when sampling a percentage of a powerful laser beam or correcting for absorption along an optical
chain.
The default value for the multipliers is 1, and the default for the offset is 0. To activate the correction
factors, click on the check box next to the multiplier and/or the offset The PC-Gentec-EO will then
display the corrected value.
For example, if you are measuring a laser beam passing through the 99.9% back reflector of a laser
(giving 1/1000
th
of the real value), choose Multiplier and enter 1000 in the dialog box. The PC-Gentec-
EO will display the laser’s power rather than the measured 0.1% sample on the main display.
It is essential to make sure that the actual measured value also complies with the power and energy limits
of the detector head. The auto range option is the default selection. You can select a specific range but
it must always be based on the actual physical measured values and not on the corrected value. Of
course, the displayed values and the display scale selection are then calculated to take into account the
correction factors.
Note that the Statistics are computed for the corrected values only.
4.3.5
Trigger Level
The trigger level only functions if an energy detector head is connected or if a power detector head is
used in Pulse Energy (Calorimeter) mode. This option allows you to change the Trigger Level from 2%
of the full-scale default value. This proves to be especially useful in noisy environments. Acceptable
values range from 0.1% to 99.9% with 0.1% steps. Caution should be taken when choosing a lower
trigger level than the 2% default value in a high noise environment.
The PC-Gentec-EO will not detect pulses with a value under the trigger level. Be careful to select a
scale that is close to the measured value, if the trigger level is high. To reset the default value to 2.0%,
simply click the Default button.