! $Id: 5196,v 4.1 1994/07/27 15:52:21 pepsa Exp $ coverpage: title_1: GHRS SMOV SIDE 1 HIGH VOLTAGE TURN ON proposal_for: SME/HRS pi_fname: JOE pi_lname: SKAPIK pi_inst: ST SCI pi_country: USA pi_phone: 410-338-4948 hours_par: 1.00 hrs: Y pi_position: GHRS INST ENG ! end of coverpage abstract: line_1: This activity will demonstrate the ability to line_2: turn on the GHRS side 1 high voltage and perform line_3: an observation on detector D1. This test will line_4: not be run until the stability of the side 1 low line_5: voltage power supply has been characterized by the line_6: GHRS SMOV Side 1 Activation test. ! ! end of abstract general_form_proposers: lname: SKAPIK fname: JOE inst: ST SCI country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: Load GHRS Side 1 Thresholds line_2: --------------------------- line_3: SU xx = Line 20 line_4: The side 1 discriminator thresholds must be line_5: loaded before any meaningful exposure can be line_6: performed with detector D1. The thresholds line_7: will be loaded and verified using existing line_8: commanding. ! question: 3 section: 2 line_1: GHRS D1 Low Voltage Dark Count line_2: ------------------------------ line_3: SU xx = Line 25 line_4: A standard internal dark count will be performed line_5: before the high voltage is turned on to identify line_6: noisy diodes. The thresholds of all noisy channels line_7: must be adjusted before the side 1 high voltage can line_8: be turned on. No special pointing is required line_9: for this test. Side 2 must remain in HOLD line_10: mode for the duration of this test. ! question: 3 section: 3 line_1: Adjust GHRS Side 1 Thresholds line_2: ----------------------------- line_3: SU xx = Line 26 line_4: Noisy side 1 channels identified by the low voltage line_5: dark test will be adjusted in the PDB. The new line_6: thresholds will be loaded to the instrument. No special line_7: pointing is required for this test. Side 2 must remain line_8: in HOLD mode for the duration of this test. ! question: 3 section: 4 line_1: GHRS Flight Software Adjustments line_2: -------------------------------- line_3: SU xx = Line 27 line_4: Currently in the GHRS flight software there is a patch line_5: to skip the test of the On-The-Fly Adder, (OTFA), during line_6: a high voltage ramp-up. This patch must be removed prior line_7: to the first turn on of the side 1 high voltage since line_8: this test of the OTFA will abort the high voltage ramp-up line_9: if there is any sign of detector glow. line_11: A table load will also set the flight software detector line_12: glow limit in the high voltage turn on processor to 200 line_13: counts. During the high voltage turn on, the flight line_14: software will abort the ramp up if this glow limit is line_15: exceeded. ! question: 3 section: 5 line_1: GHRS D1 Initial Operations line_2: -------------------------- line_3: SU xx = Lines 30 - 50 line_5: The side 1 high voltage will be ramped up line_6: using standard reconfiguration commanding. line_7: Side 1 will be transitioned to OBSERVE mode line_8: and an internal dark observation will be line_9: performed. No special pointing is required line_10: for this test. Side 2 must remain in HOLD line_11: mode for the duration of this test. Side 1 line_12: will be transitioned to HOLD at the completion line_13: of this observation. The GHRS safing recovery line_14: sequence will be included in the stored commanding line_15: in case the instrument is safed during this test. ! question: 5 section: 1 line_1: SCHEDULING REQUIREMENTS: line_2: This test should follow the last GHRS SMOV Side 1 line_3: Activation activity (Prop 5254) by no less than 2 weeks. line_5: A quick PDB update will be needed between lines 25 and 26. ! !end of general form text general_form_address: lname: SKAPIK fname: JOE category: PI inst: ST SCI addr_1: 3700 SAN MARTIN DRIVE city: BALTIMORE state: MD zip: 21218 country: USA ! ! end of general_form_address records ! No fixed target records found ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 20.000 targname: DARK config: HRS opmode: THRESHOLD sp_element: SAFE1 num_exp: 1 time_per_exp: 15M priority: 1 param_1: FUNCTION=BOTH, param_2: HIGH-VOLTAGE=OFF req_1: RT ANALYSIS; req_2: CYCLE 4/20-50; comment_1: LOAD AND EXECUTE ZMETHRES comment_2: (LOAD AND VERIFY) SIDE 1 ! linenum: 25.000 targname: DARK config: HRS opmode: PHOTOSCAN aperture: NONE sp_element: SAFE1 num_exp: 16 time_per_exp: 70S priority: 1 param_1: TYPE=SHORT-Y,SPACING=16,X=2048, param_2: Y=2048,HIGH-VOLTAGE=OFF req_1: AFTER 20; comment_1: STEP-TIME=10S comment_2: GHRS SIDE 2 MUST BE IN HOLD ! linenum: 26.000 targname: DARK config: HRS opmode: THRESHOLD sp_element: SAFE1 num_exp: 1 time_per_exp: 15M priority: 1 param_1: FUNCTION=BOTH, param_2: HIGH-VOLTAGE=OFF, req_1: RT ANALYSIS; req_2: AFTER 25 BY 7D; req_3: SEQ 26-27 NO GAP; comment_1: LOAD AND EXECUTE ZMETHRES comment_2: (LOAD AND VERIFY) SIDE 1. comment_3: THRESHOLDS WILL BE ADJUSTED BY A comment_4: QUICK PDB UPDATE. ! linenum: 27.000 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 5M priority: 1 comment_1: INSTRUCTION IS EZHVPATCH. comment_2: RESTORE TEST OF OTFA TO HVON PROCESSOR comment_3: AND SET PROCESSOR GLOW LIMIT TO 200 comment_4: COUNTS. ! linenum: 30.000 targname: DARK config: HRS opmode: PHOTOSCAN aperture: NONE sp_element: SAFE1 num_exp: 16 time_per_exp: 70S priority: 1 param_1: TYPE=SHORT-Y, param_2: SPACING=16, param_3: X=2048, param_4: Y=2048, req_1: AFTER 27; req_2: SEQ 30-50 NO GAP; comment_1: STEP-TIME=10S, comment_2: GHRS SIDE 2 MUST BE IN HOLD. ! linenum: 50.000 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 6M priority: 1 comment_1: INSTRUCTION IS EZSAFE. comment_2: GHRS SIDE 1 MUST BE IN HOLD. comment_3: ATTACH GHRS SAFE RECOVERY comment_4: SEQUENCE HERE ! ! end of exposure logsheet ! No scan data records found