Rotating the Detector (UCLES)

• Configure UCLES to the blaze peak nearest the wavelength of highest priority, or 5008 Å by default, using the 79 lines mm grating.
  UCLES: CENTRE PEAK 79
  UCLES: CONFIG
  UCLES: SL MIN
  UCLES: ARC QUARTZ

• CCD

• Select : WINDOW TEK1K_SETUP

• Take a 10 second exposure.

• Start the FIGARO routine ROTATION. This will use the continuum exposure, cross-correlate the top and bottom of the frame, and calculate the amount of camera rotation required. A 4 mm hex-key is required to loosen the clamp on the CCD mount, and the CCD can be physically rotated to the new micrometer setting.

• Take another 10 second exposure. The final image should resemble Fig. , and be rotated to within 0.1mm (on the micrometer).

    
  Figure: UCLES, 10 sec quartz lamp, SL MIN, TEK1K_SETUP, correctly rotated.
  

• IPCS

• UCLES: LF1 7 Protect IPCS with neutral density filter.

• UCLES: Open the shutter ( O) and gradually increase the slit width until a reasonable count rate is obtained.

• Use the rotation controls on the IPCS control box to rotate the detector until the central order is reasonably vertical.

• If desired do a scan correction on the middle order in the normal manner. Opinions differ concerning the advantages and disadvantages of this.