Exit the software. First exit from the ircalui GUI. Then at the
command line on ircalbox, type
imagitron stop
daemons stop
Now go power cycle the Leach electronics on the AO rack. You'll
need to go up in the lift to do this. The Leach electronics power
supply is mounted on the end of the AO rack which is closest to the
door leading from the control room into the dome. Facing that end of
the AO rack, the Leach power supply is in the upper right corner and
is labelled something like "IRCAL Power". Flip the switch off, wait
three or four seconds, flip it back on.
Back in the control room, go into the computer room and push the fiber card reset button on
ircalbox itself. This is a small white button on the VME fiber
interface card, near the right side of that card. Pushing this button
will clear up any abnormalities in fiber card state left by the
daemons when they shut down. (Note that this step may not be
strictly necessary, as the card -ought- to be in a good state after
shutdown. However I've had ircalbox crash a few times when I did -not-
press the button, so just to be on the safe side I like to press
it.)
Go back to the console and restart the software:
daemons start
imagitron start
ircalui &
Now you should be able to take some dark frames and check that
the noise level is reasonable. A good noise level for IRCAL is about
a frame RMS of 4-5 counts for a single read, and 1-1.6 counts for 16
reads CDS.