4-1
4 Making Measurements
4 Making Measurements
4.1 Start-up
To make a measurement with the PDV, proceed as follows:
Preparing
1. Make sure, that the beam shutter on the laser vibrometer is closed.
2. Position the PDV roughly so that its laser beam aperture points in the
direction of the object under investigation. If possible, position the PDV at
an optimal stand-off distance to the object. You will find information on
optimal stand-off distances in
SECTION
4.3.
Cabling
3. Plug the connecting cable of the plug-in power supply into the socket 12V
on the back of the PDV.
The connection must be easy to plug in. If not, check the plug for bent
contact pins to avoid serious damage being incurred.
Switching on
4. Plug the power supply to an earthed socket.
NOTE!
Pay attention, that the PDV reaches its optimal properties after a warn-up period of approx.
20 minutes!
5. Adapt the PDV settings to your measurement task.
You will find detailed information on how to set the settings in
SECTION
4.2. Operating the PDV via the display and the function keys is
described indetail in
CHAPTER
5.
6. Before you now open the beam shutter, remember the information on
laser safety in
SECTION
1.2!
7. Open the beam shutter. To do so, turn the corrugated ring on the front lens
to the left, when looking in the direction of the emitted laser beam.
The laser beam is now emitted.
Measuring
8. Focus the laser beam on the test surface using the focusing ring.
The signal-to-noise ratio is maximum if the signal level display fully
lights up. You can often still make measurements, even if none of the
bar graphs is displayed. The output signal in this case, nowever
contains more noise.
Select now the suitable settings as described in
SECTION
4.2 and operate the
PDV as described in
CHAPTER
5.
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