OPHIR vega User Manual page 78

an averaging period is selected, the Vega will collect
pulses at up to 180Hz and will then display the average of
those pulses. When a new pulse triggers the Vega,
"TRIG" will appear on the screen. At over 5Hz, the "TRIG"
stops flashing and appears all the time.
Note 1:
If the sensor is triggering false readings from
vibration or noise, with PE-C sensors you may set the
threshold to a higher value. If you are measuring very
low energies, you may set the threshold to a lower
value for more measurement accuracy. See section
6.2.2.3 for details.
Ophir also offers a shock absorbing mounting post
(P/N 7Z08268) that helps reduce vibration on the
sensor.
Note 2:
The Vega is able to record each pulse at up to 4000Hz
even though it is displaying at a much lower rate. This
data can be stored in a data file and recovered and
transmitted later.
Besides the usual range, laser, average information, the
Vega also displays the frequency of the laser as shown in
Figure 6.1.
6.4.1.3. Power Measurement
1. Make sure the instrument is in the power
measurement mode indicated by the units of mW, W,
etc. If it is in energy measurement mode with units of
mJ, µJ etc., then press the "Power" soft key. The
Vega can be configured to start up in power
measurement mode when turned on. See section 6.3.
2. Select "Range", enter and then use the navigation
keys to select the proper range. The correct range is
the lowest one that is larger than the pulse energy
measured. Note that the proper range is related to the
pulse energy even though we are measuring average
power.
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