The LBTO will be carrying out engineering until 4:30 pm every day.

At 4:30 pm, have the staff darken the dome, and carry out the following tests.

1. Bias Frames
  • Insert the U filter, and take 25 bias frames.
  • Run mscstat in IRAF to check that the read noise in each CCD is what you expect. See the LBC IRAF cookbook for instructions.
  • Construct the median of the 25 biases, and display it. Compare to the medians from previous nights. Here is a screenshot for a typical bias:

2. Dark Frame
  • Take a 15 minute dark exposure, and display it.
  • The "light dagger" and other scattered light evident in images only appears when the shutter is open. So the dark frame will not show this, and should be dark.
Topic revision: r2 - 12 Jan 2007, jill
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