Sharp SL-550 Guia de Resolução de Problemas descarregar pdf (Página 14)

Set-up/Operation • A-14 •

Note

When cylinders are not in use, they should always be stored in either the

projector case or a cylinder case. Never leave a cylinder loose on the ﬂoor

where it can get damaged!

Adjusting the Projector Brightness

The two dimmer knobs on the STARLAB projector allow you to set light conditions that

mimic a true sky for anywhere in the world. When the side lamps are turned com-

pletely off and the projector bulb is at maximum brightness, you will have true “dark

sky” conditions viewing approximately 3000 stars down to 5.5 magnitude. By turn-

ing up the side lights, you can simulate twilight conditions (sunrise and sunset) and

show students a more realistic “light polluted” sky which they may be more accus-

tomed to. When you rst begin the planetarium program, most participants will not

have had enough time for their eyes to “dark adapt” so you need to begin with the

projector bulb on maximum brightness. Dim the sidelights gradually and usually after

about 5 minutes, participants’ eyes will become adapted to the dark. You may now

turn the projector bulb down to about 80% brightness. This will still allow the stars to

been seen clearly, and it will greatly extend the life of the projector bulb.

Adjusting the Date and Time

You can set the STARLAB projector to view the sky for any hour of darkness for any

day of the year. Along the front of the projector is a xed hour bar showing viewing

times from 7:00 PM to 5:00 AM. The 12:00 is midnight. Below the hour bar on the

edge of the clear plastic cylinder platform are the months of the year.

Look at the accompanying graphic. Dates are approximated and can be set by turn-

ing the platform so that the relative day of the month is aligned under the selected

viewing hour. For example, if you want to view the sky at 10:00 at night on Novem-

ber 1st, rotate the platform so that the tick mark between October and November

is slightly to the left of the 10 on the hour bar. The projector is now set for 10:00

PM standard time for November 1

. Please note that in this position the projector is

also set to show you the night sky at 9:00 PM on November 18

and 8:00 PM on

December 4

. Remember you can view the same stars in the same position in the sky

at different times for different days of the year.

For daylight savings time, subtract one hour from the time you want to set the projec-

tor. For example, to view 10:00 PM on June 7

, rotate the plate so that the rst half

of June is directly under the 9 on the hour bar.

Note

When adjusting the time, always rotate the plastic cylinder platform plate

directly. Turning the cylinder may cause damage.

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

The projector is set for 60 degrees latitude.

The projector in this photo is set for Nov. 1

at 10:00 PM.

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