General Installation
Vibrex 2000 and Vibrex 2000 Plus User Guide 57
Target Diagram -
For details on this operation, see below.
Check the small LED pulsating on the back of the photocell to verify
correct placement. A faster pulse rate of the alignment indicator means
better alignment. However, if the pulse rate is too fast to observe, the user
may need to reduce the length of the retro-reflective target strip.
To calculate the best dwell time and length for the retro-reflective target
in the photocell beam, see the graph that shows minimum target length,
under “Appendix: Photocell Taping” on page 157.
4.4.3 Magnetic Pickup
If the user needs instructions on magnetic pickup installation, refer to the
aircraft maintenance manual for the subject aircraft. Refer to the
appropriate Chadwick-Helmuth Model 177M-6A Vibrex checklist for
magnetic pickup installation, if other documentation is inadequate. The
installation for the Vibrex 2000 and Vibrex 2000 Plus is the same.
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photocell
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PHOTOCELL PROBE
ROTATION
DIRECTION
RETRO-REFLECTIVE
TARGET PLACED ON THE
PROPELLER
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