Equinox Systems GEMINI Manuel d'utilisateur télécharger pdf (Page 72)

Gemini Users Manual 67

happen. You can select a value between 0 and 255, which is the number of steps made at

high speed whenever the Dec. direction is changed.

You should choose a "TVC Value" that results in a short or no delay when changing the

guiding direction in Dec. If you see a short jump, you have to decrease the value.

5.3.10.2.4 PEC (Periodic Error Control)

• Train PEC

• Maximum Pulses

• {Clear Data}

• {PEC Off (On)}

• {Delay Correction}

• {Drift Correction}

• {Smooth Data}

• {Average Data}

• {Restore Data}

Periodic Error Control ("PEC") helps eliminate the periodic error caused by the very

slight helical path variation in the shape of the RA worm. You experience these as

changes in the tracking speed, causing a star to periodically move a few arc seconds

forward or backward while the worm gear turns. The "period" is defined as the time of

one worm revolution – about 4 minutes for the G-11, HGM-200 and MI-250, 5.33

minutes for the HGM Titan, and about 8 minutes for the GM-8 and CI-700.

As long as PEC isn't trained, the only submenu items that appear are “Train PEC” and

“Maximum Pulses.” You should only select the “Train PEC” item if you already have a

star centered in the eyepiece reticle and are ready to train. If you select "Train PEC,"

you’ll have about 10 seconds to precisely center your guide star before training starts.

During the training phase, a counter on the display begins counting down from 240 to 0

for the G-11/HGM-200/MI-250, from 320 to 0 for the HGM Titan, and from 480 to 0 for

the GM-8 or CI-700.

See Chapter 4, section 4.3 of this manual for a thorough explanation of PEC and for

detailed instructions on how to use each one of the submenus.

5.3.10.2.5 Mount Type

• Losmandy GM-8

• Losmandy G-11

• HGM 200

• M.I. MI-250

• Losmandy Titan

• L. Titan (50:1)

• Custom Mount

RA Spur:

RA Worm:

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 136 137

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Equinox Systems GEMINI Manuel d'utilisateur Page 72