Polytec OFV-511 User Manual

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If the laser beam is emitted but there is no measurement signal, check the fol-
lowing:
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1. Put a piece of reflective film at an optimal stand-off distance according to
the information given in section 4.2.4 in the beam path. Focus the laser
beam on the reflective film. Does the signal level display react?
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Now check the output signals of the controller as follows:
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2. Connect an oscilloscope to the BNC jack VELOCITY OUTPUT on the
front of the controller. Does the output signal react to the movement of the
reflective film?
3. If the output signal does not react, check whether a significant DC offset is
present.
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4. Set the oscilloscope to 1V/DIV and block the laser beam. Is the output
signal noisy or is a straight line shown?
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5. Connect the oscilloscope to the BNC jack DISPLACEMENT OUTPUT on
the front of the controller. Does the output signal react to the movement of
the reflective film?
Now check the internal operating voltages of the vibrometer as follows:
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6. Switch off the controller by turning the key switch to position O.
7. Disconnect the cable to the sensor head from the back of the controller.
8. Using a multimeter, measure the internal operating voltages at the Sub-D
jack INTERFEROMETER. Figure 6.1 shows the pin configuration of the
jack. The following voltages must be measurable with a tolerance of
± 0.2V at the individual pins referred to GND.
Pin No. Voltage
1, 4, 7, 8 and 15 GND
3, 6 and 9 +16.0V
2+5.0V
13 -5.2V
5 and 10 -15.0V

Polytec OFV-511 Specifications

General

Brand	Polytec
Model	OFV-511
Category	Measuring Instruments
Language	English