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Next: Appendix F: TROUBLE SHOOTING Up: The TV acquisition camera Previous: The GRINNELL TV controls

Functions available from the GRINNELL menu

When the menu is displayed on the Grinnell TV monitor, move the cursor to the function required and press the ENTER button on the joystick controller to process the selection. When the function selected requires further positional information, up to 4 cursors can be enabled on the screen depending on the function. When they appear they may well be overlaid and so only appear as one. On the joystick controller the cursor switches determine which cursor(s) the joystick will control at any one time (for these switches, UP is ON). Once the cursors have been positioned as desired, ensure that at least cursor switch 1 is ON, and then press ENTER again to initiate the processing. A quick guide to the menu is given in the following table.

1. DRAW RESTRICTED PROFILE Requires TWO cursors to be positioned in either the X or
  Y plane and draws the profile of the data contained in
  the displayed image between the 2 cursor points. At the
  start the cursors are overlaid. This function is used for
  seeing estimates as it gives the FWHM of a star image in
  arcsecs. The profile is automatically erased when DIRECT
  is pressed.
2. SET PHOTOMETER APERTURE Enables the size of a circle which can be used to mark
  photometer apertures to be set numerically. The size (in
  arc seconds is displayed in the bottom right hand corner
  of the screen). The default value is 14" .
  To change this value
  i) Put FUN B UP
  ii) Put FUN A UP to increase the aperture size,
       DOWN to decrease.
  iii) Press ENTER n times. This will result in a change
       of n arcsecs. Limits of 5 and 30 arcseconds have
       been set.
  iv) To exit, press ENTER with both FUN A & B DOWN.
  The set value will be retained until specifically changed.

3. DRAW PHOTOMETER APERTURE i) Move cursor 1 to the required position.
  ii) Press ENTER
  Multiple cursors can be drawn (without going back to
  MENU) by ensuring that FUN A or B is UP. A single
  aperture is drawn if both are down and this is also the
  exit mode. Apertures have to be specifically eased
4. CALCULATE MAGNITUDE Requires one cursor to be positioned over the object,
  and displays the integrated magnitude of the object.
  There is an arbitrary zero point for the magnitude scale.
5. DRAW CCD O/L Draws the outline of the CCD chip on the TV screen
6. CALCULATE DISTANCE Calculates the distance in arcsecs
  between 2 cursor positions.
7. INITIALISE Initialises the TV system. No cursors.
  Resets Parameters to f/15 focus.
8. ERASE ALPHANUMERICS Clears the areas of the overlay planes
  used for displaying information.
9. ERASE OVERLAY Erases overlay plane number 2.
10. ERASE IMAGE Erases the image plane.
11. ERASE PROFILE Erases that area of overlay used to display the profiles.
12. NEXT PAGE ... Displays the second page of the menu which consists of ...
13. TEST PATTERN 0,1,2,3 Displays the Grinnell test patterns.
14. ERASE TEST PATTERNS Erases a test pattern.
15. INTEGRATION PARAMETERS Displays the current integration parameters
  (i.e.the status of the rotary switches).
16. DRAW SLIT Requires all 4 cursors to be positioned independently
  and then joins them up. Intended to be used for marking
  slits, but can be used to draw any quadrilateral.
17. DRAW CIRCLE Requires 2 cursors to be positioned to define the
  diameter of a circle which is then drawn. Useful for
  defining the position of photometer apertures.

18. DRAW BOX Two cursors are enabled which are used to define the
  side of a rhombus. The line joining the two points must
  have a positive gradient in the X-Y plane of the screen.
  If the 2 cursors have the same Y position, they will
  define the top side of a square. If they have the same X
  position, they define the left hand side of a square.
19. ZOOM Zoom factors are determined by the state of the
  function switches FUN A & FUN B on the cursor
  controller. Setting one or both of these switches
  followed by ENTER causes a new zoom factor to become
  operational. The factors are :
  FUN A set, zoom = 4
  FUN B set, zoom = 2
  FUN A+B set, zoom = 8
  The zoomed image can be panned via the joystick. To
  exit from zoom, turn both function (FUN) switches off
  (down) and press ENTER. This facility requires the
  TRACK switch to be up (on).
20. F/8 FOCUS               Changes the scale of the displayed image to correspond
  to the scale at the F/8 focus. Never needed as there
  is no TV at f/8. To return to f/15 do a MENU

next up previous contents
Next: Appendix F: TROUBLE SHOOTING Up: The TV acquisition camera Previous: The GRINNELL TV controls