Gentec-EO MAESTRO - Manual (Page 34)

MAESTRO User’s Manual Revision 8.1 33
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.
To disable the correction factor, touch the check box corresponding to the correction factor (multiplier or
offset) in the Corrections menu window.
2.4.2.5 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.
To change the trigger level value, access the menu window by selecting Trigger Level from the Set
Measure menu. Touch the edit button and enter the desired number in percentage. Once the
trigger level is set, touch the OK button to save the changes or the cancel button to ignore
the changes. The MAESTRO 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 touch the Default button.
Fig. 2-17 Trigger Level window
Caution! If you select a high value trigger level, the MAESTRO may not be able to detect all the values
of widely varying energy levels in auto range mode. The auto range function uses the energy level of
the last pulse to set the scale level. Therefore, it will not detect the next pulses if they are lower than the