Installation Instructions for Polar Camera

Tripod installation:

- If tripod left in place over summer, and present location still
  feasible in light of new instrument requirements, go straight to
  "level ..." step;

- select approximate tripod location using 20-m nylon rope to 
  gauge maximum cable run from proposed control PC location (or 
  vice versa)

- place tripod on fairly surface with apex of triangle oriented 
  approximately geographic North;

- level the tripod and rectangular frame using the supplied 2'
  carpenter's level, first along the N-S direction (apex - base),
  and then  along the E-W direction (along the base of the tri-
  angle), by turning the wingnuts to adjust the height of each 
  corner of the tripod;

- tighten the upper nuts at the corners of the tripod;

Control PC Installation:

- I assume the PC, monitor, voltage regulator, and other minor 
  indoor components of the system were not relocated during the 
  March shutdown;

- First connect control PC as follows:

  mains <--- voltage ---- power bar <--- PC
	    regulator

- Replace 9-pin "D" connector ("shorting plug") into socket at
  lower right of PC backplane
  
- Follow attached instructions re: "Installing and Testing the 
  PoCa Host Watchdog Timer"

- The final configuration of AC connections is as follows:

  mains <--- voltage ---- power bar <--- watchdog timer <--- PC
            regulator     ^ ^ ^ ^
                          | | | \----- monitor
                          | | |
                          | | \------- Cam 0 "clean" AC }
                          | |                           } white 
                          | \--------- Cam 1 "clean" AC } collars
                          |
                          \----------- battery charger

  mains <--- power bar <--- Cam 0 "dirty" AC
                     ^
                     \----- Cam 1 "dirty" AC

NOTE: For each camera, "clean" AC and "dirty" AC lines are bundled
      in a common cable.

- Data cable connections are as follows:

- Cam 0 imager data sub-cable (25 pin "D" plug) to upper 25-pin
  "D" socket in PC backplane (should be marked "C0" or some such)

- Cam 0 auxiliary data sub-cable (9-pin "D") to 9-pin "D" connect-
  or just to the right of the Cam 0 data connector in PC backplane

- Cam 1 imager data sub-cable (25 pin "D" plug) to lower 25-pin
  "D" socket in PC backplane (should be marked "C1" or some such)

- Cam 1 auxiliary data sub-cable (9-pin "D") to 9-pin "D" connect-
  or above Cam 0 auxiliary data connector in PC backplane

NOTE: For each camera, imager data and auxiliary data sub-cables
      are bundled in a common cable.

NOTE: If the data cables are still attached to the PC, disregard
      the above.

Camera Installation:

- the two cameras are numbered 0 and 1 on the aluminum flanges 
  holding the domes; camera 0 sits on the west side of the tripod 
  (on your left as you stand at the base), and camera 1 on the 
  east side; each camera enclosure has a CNSR sticker on the side 
  that faces north;

- on camera 0 the handles point NW and SE, so the camera can be 
  placed on the tripod over the SW corner; on camera 1 the handles
  face NE and SW;

- place each camera carefully on the rectangular frame, and slide
  and/or rotate it so that the baseplate and enclosure flange fit
  underneath the two stainless steel (SS) retainers ("mushrooms"),
  and the SS pin on the S side of the rectangular frame fits into
  the semicircular recess in the baseplate;

- once each camera is in place, engage the latch on the NW (camera
  0) or NE (camera 1) corner of the rectangular frame;

- attach the two cables numbered "0" to the underside of camera 0,
  and do the same for camera 1; the connectors for the cables are
  different sizes and genders so there can be no confusion, but 
  you may have to rotate each cable to find the right orientation 
  to mate with the connector on the baseplate.

Camera Orientation:

- Once the cameras have been installed and cabled, and are operat-
  ing routinely, adjust the orientation of the cameras to the 
  desired direction by reference to the Sun and/or Moon at times 
  when their azimuths are known.  The best times are when the Sun 
  and/or Moon are at the desired azimuth for the central meridian 
  of the cameras.

- at the appropriate time, loosen the SS screw holding the rect-
  angular frame to the tripod and adjust the frame's orientation 
  until the short cross-tubes of the frame are aligned with the 
  reference object;

- if the camera cables prevent you from moving the rectangular 
  frame to the desired orientation, rotate the entire tripod until
  the desired frame orientation is achieved, with a margin for 
  error;

- tighten the SS screw firmly, and tie the tripod down to the deck
  with ropes at each corner.

- if you moved the tripod, check that it is still level, and make
  any needed adjustments, before finally tying the tripod down;

- verify the orientation at other times as opportunity allows, to
  ensure that the cameras have not shifted in the wind;