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7.2 Setting the Grating

Open the grating window with the grating button at the top of the TC window. Select the appropriate camera, grating and collimator with the respective buttons. Now the order and wavelength can be entered on the appropriate line, activated with a carriage return or clicking the left mouse button on the line. The AC power switch on the slit-head panel should be on. Before clicking on the ``set grating'' button, turn on the grating drive switch in the console room rack. If after checking the wavelength centering it is found to be not quite right, the ``nudge'' button can be used to move up or down the specified amount. Switch off the power in the console room rack when finished as the grating can move slightly with the power on.