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Фрагмент инструкции
Attach the 5-pin connector over the 5 pins at the top of the electronics module (labled R.A. Motor), and then plug the phone jack connector into the R.A. motor. Once plugged into the proper power source, activate the drive by placing the ON/OFF switch in the “ON” position. Once activated, the drive begins tracking at sidereal rate, the default tracking rate. The LED next to the sidereal rate icon will illuminate. Figure 5-1 The CI-700 electronic console. Using the Drive • 37 Guide Speed Figure 5-2 Tracking Rate Selection Figure 5-3 This function allows you to select the speed at which the motor moves when corrections are made via the hand controller. Once the drive is activated, the default setting is .3 times sidereal rate. Press the Speed button to change the guiding rate. The selections are .3x, .5x, 8x, and 16x sidereal rate. For guiding, use either the .3x or .5x setting. These two rates allow optimal use with autoguiders. The faster settings — 8x and 16x — are perfect for positioning objects within the field of view. The telescope can also move at 20x speed WITHOUT changing any of the guide settings. To control the telecope at 20x speed, press the button that corresponds to the direction you want to move the telescope. While holding the button down, press the opposite directional button. For example, if you want to move the telescope west, hold the west button down and then press the east button. Conversely, if you want to move the telescope east, hold the east button down and then press the west button. This “fast-set” function also works in declination. It should be noted that the R.A. setting circle does not remain calibrated when using any of the slewing rates. NOTE: If the 20x speed is not functioning (but all other speeds do), it is probably due to low voltage from your power source. The drive has four basic rates: sidereal, solar, lunar and King (which is a modified sidereal rate that takes into account atmospheric refraction). While solar and lunar rates are obvious, sidereal and King rates require a little more explaining. Sidereal rate is based on a single rotation of the Earth which takes 1,436.5 minutes. An astronomer by the name of King discovered that atmospheric refraction affects the apparent motion of objects across the sky. The King rate takes into account this refraction caused by the Earth’s atmosphere and is recommended for deep-sky astrophotography. For deep-sky observing, either King or sidereal rate is fine. Each of the tracking rates is represented by an icon. Sidereal rate is represented by a star ( ), solar rate by a sun ( ), lunar rate by a crescent moon ( ) and King rate by a crown ( ) . Next to each icon is an LED to indicate which rate has been selected. Once the power has been turned on, the drive tracks at sidereal rate, the default tracking rate. To change the tracking rate, press the “TRACK RATE” button. Pressing the button once changes the drive rate once. The rates are selected sequentially from bottom-to-top as listed above. Note that the PEC function does NOT have to be activated for the drive to work. However, once PEC is activated, the drive rate is locked on the one selected. You can not change rates until PEC is turned off. 38 • Using the Drive BC — Backlash Correction Figure 5-4—The guide rate and tracking rate lights are used to indicate the amount of backlash correction. Periodic Error Correction (PEC) Definition: The BC (Backlash Correction) function allows you to eliminate the backlash in the DEC motor when changing directions (i.e., from north to south or vice versa). Here’s how it works. Each time you change the direction of the telescope in declination, the motor speeds up momentarily to take up any slack. The Tracking Rate and Guide Speed displays are used to regulate the "aggressiveness" of the backlash compensation. The best setting is determined by looking through the eyepiece while changing the direction of the DEC motor and then moving through the BC button settings until the backlash has been eliminated. To activate this function, press the BC button. Once activated, the .3x guide speed and sidereal tracking LED will flash rapidly. Use the east and west (left and right) buttons on the hand control to change the backlash compensation speed. Press the right hand control button and the next guide speed light (.5x) will illuminate. When the hand control button is pressed four times, the next tracking rate light ( ) will illuminate. Continue pressing the hand control buttons until the desired compensation speed is reached or until you reach the highest setting (16x and ). Once the desired level is set, press the BC button again to activate backlash correction. The BC must be reset each time you power up the drive. Periodic Error Correction, or PEC for short, is a system that improves the tracking accuracy of the drive. PEC is designed to improve photographic quality by reducing the amplitude of the worm errors. Using the PEC function is a two-step p...
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