Sharp SL-550 Guia de Resolução de Problemas descarregar pdf (Página 21)

• A-21 • Set-up/Operation

Adjusting the Latitude

You can set the STARLAB projector to view the sky from any location in the northern

or southern hemisphere (from the pole to the equator) by tilting the projector sup-

port plate and using the Latitude Adjustment Bar found on the right-hand side of the

projector. Look at the accompanying graphic. Below the latitude bar is a distorted

map with latitude lines drawn every 15 degrees. When the projector is straight up

and down, you are at the pole. When it’s tilted all the way over to one side, you

are at the equator. Decide what latitude you wish to view the sky from and calculate

where it would be on the map using the marked latitude lines as a guide. If need be,

estimate the position by interpolating between the marked lines. Tilt the entire projec-

tor platform until the desired location lines up with the edge of the bar marked “align

location with this edge.” The cylinder stays tilted due to friction and will stay in this

position until you change it.

Note

When tilting the cylinder, always use the two metal brackets on the two

sides of the projector and never push directly on the cylinder because it may

damage it. When changing cylinders, always reset the projector to the polar

position.

Earth Rotation Control

The STARLAB FiberArc has a variable speed motor and a selector switch to control

the direction of Earth’s rotation to match that of either the northern or southern hemi-

sphere. The platform rotation switch is a toggle near the center of the projector con-

trol panel. Flipping the switch up to the “Northern Hemisphere” position causes the

cylinder to rotate in a clockwise direction. Flipping the switch down to the “Southern

Hemisphere” position causes the cylinder to rotate in a counterclockwise direction.

The speed of the rotation is controlled by the knob labeled “Motor Speed” located

directly to the right of the direction control switch. Turning the dial clockwise increases

the speed and counterclockwise decreases the speed. When the knob is completely

counterclockwise (off), you can also move the projection cylinder manually by rotat-

ing the bottom of the clear plastic cylinder support plate.

Note

Rotating the projector at maximum speed may cause some individuals to

experience motion sickness.

Using the Cardinal Points and Meridian Projectors

The STARLAB FiberArc Projector has two accessory projectors built into it to allow you

to add specic reference points to the projections on the dome. The two knobs on the

left-hand side of the front of the projector, independently control each projector.

The Cardinal Points Projector is built into the base of the FiberArc Projector directly

below the clear plastic projection cylinder platform. When it is on, it projects let-

ters showing the 8 cardinal directions (N, S, E, W, NE, NW, SE and SW) along

the horizon. The brightness of these letters is controlled by the dimmer knob labeled

“Cardinal Points Projector”. Turning the knob in a clockwise direction increases the

brightness while a counterclockwise direction dims it down to off.

The Meridian Projector is attached to the support bracket found along the lefthand

side of the FiberArc Projector. When it is on, it projects a scale (at 5 degree incre-

ments) across the top of the planetarium dome showing the angular measurement

from the northern horizon to the zenith and across to the southern horizon. It is very

The projector is set for 60 degrees latitude.

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