Next: Doing a pulser run Up: MiniDAQ instructions Previous: Geometry run using Slow Controls

Doing a Pedestal Run

Note: The pulser should be left connected; it is enabled and disabled by MiniDAQ according to the run type.

  1. Verify that the anode-wire high voltage has been reduced enough to eliminate significant gas gain; other voltages should be at their normal settings.

  2. The Run Control GUI on the Run Control desktop shows the EVENT TYPE; if it's not ``pedestal'' (and both DAQ and SC states are ``idle''), pull the ``OTHER EVENTS'' menu down and ``unconfigure.''

  3. When DAQ and SC are ``initialized,'' click CONFIG to bring up a configuration window. (MiniDAW configuration uses information only from the configuration window; any settings in the other window are irrelevant for the moment.) Enable the desired Rosies by clicking the boxes number 1--6, then double click on the ``Pedestal'' event type. Click OK.

  4. When DAQ and SC are ``idle,'' go to the main Run Control window and set: the run and tape numbers; the comment; enable taping and netfeeds, if desired. If these pedestals are to be used online (e.g., for zero suppression), you must have select ``Update On-line Tables.''

  5. If raw data are needed, 8-bit ADC's are usually adequate, since the pedestals are supposed to be < 255. Often, one might request only the result tables: means, shifts, RMS; or no output tables, if one only wants to initialize the on-line tables for pedestal subtraction.

  6. After the settings are finalized, click GETSET.

  7. When DAQ and SC are ``poised,'' click GO.

  8. If no Run Control logger window is present, open one from the OPTIONS menu. Verify that events are being logged. If not and the logger window has been open for awhile, exit from it and open another one...the logger windows "wear out" for some unknown reason.

  9. A 64-event run takes 10-15 minutes. Watch the logger window for empty events, which usually appear after about twice the requested number of events, given the two possible event cycles. The logger window event count includes begin-run and slow-controls events.

  10. Click END.
If questions arise as to which tables appear in which event, one can grab events with Staf and print the index tables, which usually have only a few rows. The event number appears in the first column (?) of the first row. The sector and location of the readout board (as defined by its DIP switches) are listed in other columns for each row.

Written: July, 1996 by Doug Greiner and Wayne Betts
Last modified: August 6, 1998 by R.Bossingham

Page maintenance:

Roy Bossingham, LBNL