DSOS Users Procedure

Melanie Leong, November 26, 2007
Hiroshige Yoshida, September 13, 2011

1  Flow to the DSOS Heat Exchangers

2  Login to tpick as visitor

Log in from a computer that is not prone to crashing! I usually use my own laptop. The Controller's computer name is tpick.

3  Initialize and Create the Night's Baseline Setting

Initializing should be done with the dome open at least 1 hour and after sunset, dish ZA = 45°.

4  Power to the Driver Amplifiers

5  Let the Dish System Settle for about 15 minutes

The power supply displays should reflect the current demands, cycle, and then settle after 15 minutes depending on the amount of initial toothpick displacements. The settled current values are about 9 Amps or less for both +15 Volt and -15 Volt power supplies.

6  During Your Observation Night

7  * Check the System periodically * to make sure everything is powered up and running correctly.

Should any of the above occur, power down the power supplies first! Then shut the rest of the system down.
If any of these things cease to function, the system may get damaged and the dish will not be adjusted correctly.
VERY ESSENTIAL STEP - Notify CSO staff what has failed, and when it occurred. Failure to do this will keep the DSOS from operating while you are here.

A  Some Solutions

A.1  IF You Want to Rebaseline

If you initialized the system's thermistors during the day before the sun has set, reinitializing 1 hour after the sun has gone down would be a good thing to do. It is NOT recommended that you perform this often.
Another reason to reset the baseline is if the ambient temperature changes more than 5°C from the initial ambient temperature. Significant changes in temperature in the middle of the night usually indicates bad observing weather, so be sure to check if it is raining or snowing. You may need to shut the dome.

A.2  Computer Crash

If the computer you are running the DSOS software from crashes:

A.3  Neslabs

In case the alarm sounds on any of the Neslabs on the 3rd and 4th floors:

A.4  Glycol Pumps

In case any of the 4 pumps to the dish manifolds fail, usually no or low pressure reading on meters, and the pump is hot to the touch:
Good Sky,

File translated from TEX by TTH, version 4.03.
On 21 Feb 2012, 13:19.