THORLABS MNA601/IR, Руководство пользователя

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Appendix A Troubleshooting
Question . Although the green ‘T
RACKING
’ LED is on, the circle appears to wander
across the display screen.
Answer .
1) Increase the size of the scan circle diameter.
2) Increase the gain.
3) Adjust the phase offset.
4) Check the connections (see Section 4.2.1.). Check, using a dial gauge, that the
stage moves in the horizontal and vertical axes (perpendicular to the fiber axis)
when the manual control knobs on the Piezoelectric Controller GUI is adjusted.
5) An important point is that the ‘T
RACKING
’ LED is activated simply by an optical
power threshold. If the power meter is set to a range that is too sensitive, it can be
activated by noise. Increase the range, or adjust the micrometers to increase the
optical power.
Question. Given the answer 5) above, how can I verify that the NanoTrak is really
tracking?
Answer. If you make a small adjustment to one of the Micrometers, the circle will
move slightly as the NanoTrak adjusts its drive outputs to track the maximum.
Question. Does the circle have to be precisely in the centre of the display?
Answer. No, the NanoTrak can track correctly as long as the circle is not at the edge
of the display.
Question. The optical power transmitted from fiber to fiber is much less than I
expected.
Answer. Check that the ends of the fibers are well cleaved and clean.