3-8
3 First Steps
Switching on
3. Connect the power supply to an earthed socket.
On top of the PDV the display lights up. Laser light is not yet emitted as
the beam shutter is still closed.
4. Before you now open the beam shutter, remember the information on
laser safety in
SECTION
1.2!
5. 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.
Test
6. Point the aperture of the PDV onto a matt white test surface, e.g. a piece
of paper.
7. Position the PDV approximately 23cm away from the test surface
(measured from the retaining ring for the font lens, refer to
SECTION
4.3
and
SECTION
7.2.5). Focus the laser beam on the test surface using the
focusing ring.
If the signal level display on the display lights up, the optics and the
input section of the electronics are working correctly.
8. Set the measurement range (Velo) 20mm/s on the PDV.
9. Connect an oscilloscope to the BNC jack ANALOG OUT on the back of
the PDV.
10. Set the oscilloscope to 1V/DIV and move the test surface.
If the voltage shown on the oscilloscope reacts to the movement of the
test surface, the decoder and output section are working correctly.
NOTE!
Pay attention to the high pass filter being switched off (HP=N). Otherwise you have to move
the test surface rapidly.
If the functional test has been successful, you can install the PDV in the
measurement location as described in
CHAPTER
4 and
CHAPTER
5. Pay
attention, that the PDV reaches its optimal properties after a warm-up period
of approx. 20 minutes.
If your PDV does not perform as described above, read through the
information on fault diagnosis in
CHAPTER
6 and if necessary, contact your
local Polytec representative.
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