Polytec OFV-511 - Page 27

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11. Focus the laser beam on the reflective film by turning the mini sensor.
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12. If you have not been able to observe the effect described under 11., check
the signal level again after 20 minutes. After this warm-up phase the laser
has reached its working temperature (refer also to section 4.2.4).
If the functional test has been successful you can now make measurements
as described in chapter 4.
If your vibrometer does not perform as described above, read through the
information on fault diagnosis provided in chapter 6 and, if necessary, contact
your local Polytec representative.