iOptron SMARTSTAR IEQ45TM - Manual (Page 26)

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5.4.3. Set Anti-backlash
All mechanical gears have a certain amount of backlash or play between the gears. This play is
evident by how long it takes for a star to move in the eyepiece when the hand control arrow buttons are
pressed (especially when changing directions). The Go2Nova
® hand controller anti-backlash feature allows
user to compensate for backlash by inputting a value which quickly rewinds the motors just enough to
eliminate the play between gears.
To set the anti-backlash value, scroll down and select “Set Anti-backlash”
Press ENTER. A R.A. anti-backlash screen will display:
To adjust steps move the cursor to each digit and use the number keys to input number directly.
Press ENTER – “DEC anti-backlash” will display:
Move the cursor to each digit and use the number keys to set the anti-backlash. Press ENTER to go
back the previous screen. Press BACK button to go back to main menu.
While viewing an object in the eyepiece, observe the responsiveness of each of the four arrow
buttons. Note which directions you see a pause in the star movement after the button has been pressed.
Working one axis at a time, adjust the backlash settings high enough to cause immediate movement without
resulting in a pronounced jump when pressing or releasing the button. The hand controller will remember
these values and use them each time it is turned on until they are changed.
The 8407 hand controller has a function to test the mount backlash number and can store the anti-
backlash steps here. The maximum steps are 9999.
5.4.4. Meridian Treatment
This function tells mount what to do when it tracks across the meridian. There are three options.
Stop Tracking will stop the mount when it passes the meridian. Telescope Flip will flip the telescope and
continuous to track the object. The third option is Continue to Track. In this case, the mount will keep
tracking and the OTA could hit the tripod leg if the mount is not monitored.
Set Up Time and Site
Set Display and Beep
Set Anti-backlash
Meridian Treatment
Set Eyepiece Light
Heating Controller
Upgrade R.A. and DEC
Firmware Information
R.A. anti-backlash:
0000 steps
One step equals to
0.09 arc second.
DEC anti-backlash:
0000 steps
One step equals to
0.10 arc second.