Polytec PDV-100, User Manual

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6-2
6 Fault Diagnosis
Only for battery
operation
6. Is the display showing the following warning ?
The laser has been switched off because the battery is empty. To avoid
completely draining the battery and thus shortening its useful life, set
the rocker switch of the battery charger in the direction of the charge
level indicator. Then reload the battery as described in
SECTION
A.1.2
under Charging Battery.
6.2 No Measurement Signal
If the laser beam is emitted but there is no measurement signal, proceed as
follows:
1. Put a matt white test surface, e.g. a piece of paper, in the beam path
approx. 23 cm away from the retaining ring for the front lens. Focus the
laser beam on the test surface using the focusing ring. Does the signal
level display react ?
If the signal level display does not react, either the optics or the input
section of the electronics are faulty.
2. Connect an oscilloscope to the BNC jack ANALOG OUT on the back of
the PDV and check if the output reacts to moving the test surface.
HINWEIS!
Pay attention to the high pass filter being switched off (HP = N). Otherwise you have to move
the test surface rapidly.
3. If the output does not react, check if a significant DC offset is indicated.
Normally a DC voltage less than ±10 mV can be measured.
4. Set the oscilloscope to 1 V / DI V and block the laser beam. Is the output
signal noisy or does the oscilloscope show a straight line ?
Noise must occur when the laser beam is blocked.
6.3 Focusing Ring can not be Moved
Make sure that the clamping screw on the focusing ring is undone (refer to
SECTION
5.5).
WARNING
Batt. empty
Laser: -Off-