How to take bias sequences

It is always a good idea to take a series of bias exposures, to check for readnoise. To avoid crosstalk left and right arms should be read out separately.
  1. Ensure dome is dark, shutter closed.
  2. Make sure CCDs are set up as for science exposures: check window and readout speed
  3. Issue DAS command multbias pnsl 11; multbias pnsr 11; multbias pnsHa 11 which will first take 11 PNSL biases, then 11 PNSR biases and then finally 11 PNS Ha biases.
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