Paramount MX User Guide
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P a g e
TheSkyX Professional Edition
is used to compute, retrieve and save a periodic error correction curve to
the Bisque TCS firmware.
When the
Apply PEC Corrections
checkbox is turned on, the resulting corrected periodic error of the
mount should be less than one arcsecond (usually 1 arcsecond peak to peak error or less), which is
normally less than the errors introduced by local seeing conditions (typically 1-5 arcseconds, depending
on the location, weather conditions, etc.).
Figure 40: The Bisque TCS PEC Table tab on the Periodic Error Correction tab (Bisque TCS window).
Apply PEC Corrections
Turn this checkbox on to apply periodic error corrections during sidereal tracking. Note that periodic
error correction will not be applied when tracking fast moving objects, such as spacecraft.
Bisque TCS PEC Table Tab
The
Bisque TCS PEC Table
tab on the
Periodic Error Correction
tab shows a graph of the mount’s
periodic error correction table. Note that you must first retrieve or
Get
the periodic error table that is
stored in the mount’s firmware. The message
No Table Present
is displayed on the graph if the periodic
error data has not been retrieve from the mount, or the mount does not have a periodic error curve.
The green line on the graph shows the corrections that are applied over one period of the worm. The
lack vertical line shows the current position of the worm in the PEC table.
The shaded purple region shows a graph of the mount’s periodic error or PEC table. The X-axis
represents the time for one revolution of the worm. The Y-axis shows the magnitude of the correction
at a given worm position. The red line shows the actual periodic error correction, in arcseconds that is
applied over one revolution of the worm.
