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PART XI : ADVANCED FUNCTIONS
11.6 Calibrating Auto-Home Offset
• Press “1” key to keep the original Home Position Offset.
• Press “2” to use the results obtained from the 1-star alignment to calibrate the home
position offset.
1. PEC can only compensate tracking errors on the R.A. axis. Therefore, a precise polar
alignment is still required to track minor errors on the Dec. axis.
2. After turning on the PEC replay, it is recommended to wait for at least one cycle time
of the period error before taking a picture.
3. To re-use the PEC data on a mount which supports SPEC, users should park the tele-
scope before shutting off power (refer to Section 11.1). This limitation does not apply to
the mounts which support PPEC.
Some Sky-Watcher’s equatorial mounts (ex. the EQ 8 mount) has the Auto-Home function
which can set the mount to a standard home position after turning on the power.
The offset of the home position can be calibrated and compensated with the following
procedures:
1. Polar-align the equatorial mount accurately.
2. Turn off the power, and then turn it on again, and then initialize the hand controller.
3. When SynScan hand controller asks “Auto-Home?”, press the “1” key to execute the au-
to-home process.
4. Finish the subsequent initialization steps.
5. At the end of the initialization, choose 1-star alignment to align the mount.
6. At the end of the 1-star alignment, the hand controller will ask “Update H.P.O? 1)No 2) Yes”
(The “H.P.O.” means Home Position Offset).
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