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A dark frame is recorded under the same conditions (exposure time) as the science
frame. The following steps must be followed to successfully remove dark current from
the science exposures:
1. Switch off the light source or cover the single-mode fibre input.
2. Acquire a dark frame with the same exposure time as the science frame.
3. Click the Set Dark button in the toolbar.
After the dark frame has been set, the Subtract Dark toolbar button can be toggled to
automatically remove the dark signal from any recorded spectra (Figure 14).
NOTE: You must repeat steps 1-3 whenever you change the exposure time.
© Redback Systems Pty Ltd
Figure 14: Subtract Dark icon activated.
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