Selecting Settings From The Vega Screen - OPHIR vega User Manual

Energy of a single pulse is measured on the Vega by
digitally integrating the pulse power over time.

4.2 Selecting Settings from the Vega Screen

The Vega can be set to various chosen settings while
operating. In addition, it can be set so that it will be in the
desired configuration when turned on the next time.
4.2.1. To Set Type of Laser being Used
Thermopile sensors have somewhat different absorption
at different wavelengths. In order to compensate for
this, each sensor has been calibrated by laser at several
wavelengths. When you choose the correct laser
wavelength, the correction factor for that wavelength is
automatically introduced. Note that the laser wavelength
correction in use is displayed in the upper left corner of
the display.
Thermopile sensors with the LP1 absorber have large
variation of absorption at different wavelengths.
Therefore a continuous spectral curve is inserted into the
sensor, enabling the user to choose the desired
wavelength from the range specified in the specification
sheet and the correction factor for that wavelength is
automatically introduced.
4.2.2. To choose Manual or Automatic Ranging in Power
Measurement
Autorange - The Vega allows you to choose autorange or
manual ranging. In autorange mode, you do not have to
change scales. When the reading of the meter or bar is
more than 100% of full scale, the range goes to the next
higher one. The ranges are arranged in factors of 1, 10,
100, etc. When the reading falls below 9% of full scale,
the range changes to one range lower. This change only
occurs after a few seconds delay. This provides overlap
(hysteresis) to keep the Vega from flipping back and forth
when reading close to the end of the scale.
To choose auto range, select "Range", enter, choose
"AUTO" then enter again. If you wish the Vega to be in
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