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3.2.2.2 Velocity tach calibration
Once the chair's drift has been corrected, click Go for the Velocity tach calibration. The software will then
spin the chair to optimize the signal voltage and tach voltage values to synchronize the traces. After two
spins past the chair's zero position (seen by the deflections in the PPR trace), the software will stop the chair
and update the signal and tach voltage values. Click Stop to clear the traces from the graph or stop the test
early.
It is important the there are no PPR pulses under the acceleration of the Orion Chair (linear increase of
Tach). If a PPR pulse is seen under the acceleration period, the calibration must be repeated.
Figure 24: Example of Orion Reclining calibration
3.2.2.3 Sine wave validation
Once both calibration tests have been performed, select Validation for the maintenance routines to perform
the Sine wave validation test. Click Go to run a sinusoidal test for one cycle at 60 degrees per second at 0.04
Hz. These settings can be adjusted if necessary.
The chair will rotate using the calibrated settings and should have the signal and tach traces appear
superimposed. If the traces are not adequately aligned, perform the calibration tests again.
Figure 25: Example of Orion Reclining validation
D-0120794-D – 2023/06
Orion Reclining Chair Installation Instructions
Page 23
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