Equinox Systems GEMINI Manuel d'utilisateur télécharger pdf (Page 53)

Gemini Users Manual 48

If the averaging function is not used, newly trained data simply replaces the previous

training run in the current data set. The previously averaged data remains available in the

backup data set, allowing you to ignore bad training runs (those with lower quality

guiding).

4.3.2.8 Restore Data

This function simply copies the data from the backup data set to the current data set. You

can use this to overwrite a flawed training run with the previous trained or calculated

data.

4.3.2.9 Maximum Pulses

Gemini divides the worm revolution into 6400 intervals, and periodic error corrections

are made by applying the guiding rate on top of normal sidereal motion. If guiding rate is

0.5x sidereal then during any of the 6400 worm intervals the rotational speed could be

1.5x sidereal (moving faster), 1.0x sidereal (no correction needed), or 0.5x sidereal

(moving slower).

Correction can be applied for more than one interval consecutively when larger

corrections are required. So, for example, on a mount with a 240 second worm period,

each worm interval will be 240 / 6400 = 37.5ms. If you press the hand controller RA key

for 1 second, this will apply guiding rate correction for 26.67 worm intervals.

The Maximum Pulses setting establishes a limit on the number of consecutive worm

intervals to which Gemini will apply correction in response to a correction command

from the hand controller, auto-guider, or control software. Thus, in the example above, if

Maximum Pulses had been set to 5, the guiding rate would have been applied for just 5

intervals instead of 26.7, even though the RA key was pressed for 1 second.

This feature allows very small time intervals to be generated reliably even when the

method used to train the periodic error correction is not capable of so doing. This might

be the case, for example, if the required corrections are small, but a slow PC is being used

or human reaction time is slow to release the guider button.

Set Maximum Pulses to zero (the default) if you don’t want to set a limit, and always

want to apply the full correction that is requested.

4.4 Other Functions

There are two other functions that are especially useful when imaging. They are:

• TVC – Helps compensate for the response delay when changing direction in Dec.

caused by gear backlash.

• Alarm Timer – Allows you to set alarms to alert you to the end of an exposure

time.

Refer to chapter 5 for a complete description of these functions.

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Equinox Systems GEMINI Manuel d'utilisateur Page 53