File $Source: /home/juda/www/hrc_flight/RCS/sh2_act.html,v $
Version $Revision: 1.4 $
Last Update $Date: 1999/05/10 18:08:08 $
HRC CCB Status Approved

OP03 Procedures op03:

HRC Command Sequences

Antico. Shield 2 Manual On and Ramp-up

Description:

This is the sequence that will be used the first time the HRC anticoincidence shield PMT#2 is activated and for subsequent activations until adequate confidence in the performance of the PMT is gained to allow for autonomous operation.

This sequence starts by setting the HV level for the anticoincidence shield photomultiplier tube (PMT) to its minimum value and then turns on the HVPS. After verifying that it is OK to proceed, the HV is raised to the operational level

Cautions/Restrictions:

This sequence requires a real time contact for its entire duration.

Using PMT#2 is now standard operation; the signal amplifier configuration must be changed from the one established by Power Up HRC on CEA A - SCS #69 before this procedure is executed.

Flow Diagram

Delta-Time Command Mnemonic Description Cmd Field Mnemonic Data Parameter Telemetry Verifier Expected Value Notes
Verify with Science Team that it is OK to proceed
00:00:01.000 2S2STHV Set shield PMT#2 HVPS step to 0 2S2STHV2 0 2S2HVST 0 sd0e00
Verify PMT#2 HV Settings and Analog Monitors
Wait for Science Team Approval to Proceed
00:00:01.000 2S2HVON Turn on PMT#2 HVPS     2S2ONST ON sd0d01
Verify PMT#2 HV Settings and Analog Monitors
Wait for Science Team Approval to Proceed
00:00:01.000 2S2STHV Set shield PMT#2 HVPS step to 4 2S2STHV2 4 2S2HVST 4 sd0e04
Verify PMT#2 HV Settings and Analog Monitors
Wait for Science Team Approval to Proceed
00:00:01.000 2S2STHV Set shield PMT#2 HVPS step to 8 2S2STHV2 8 2S2HVST 8 sd0e08

$Log: sh2_act.html,v $

Revision 1.4 1999/05/10 18:08:08 jhc

corrected initial time delay to 1 sec

Revision 1.3 1998/11/06 22:19:16 juda

Marked as "Approved"

Revision 1.2 1998/06/01 12:28:46 juda

Added a "wait" between inital setting of HV step to 0 and HV turn-on

Revision 1.1 1998/05/20 19:25:45 juda

Initial revision

Dr. Michael Juda
Harvard-Smithsonian Center for Astrophysics
60 Garden Street, Mail Stop 70
Cambridge, MA 02138, USA
Ph.: (617) 495-7062
Fax: (617) 495-7356
E-mail: mjuda@cfa.harvard.edu