! File: 2852C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:18:37:56 coverpage: title_1: HRS THRESHOLD ADJUSTMENT TEST sci_cat: CALIBRATION proposal_for: CAL/HRS pi_fname: JOE pi_lname: SKAPIK pi_inst: STSCI pi_country: USA pi_phone: 301-338-4948 hours_par: 6.50 hrs: Y pi_position: SI ENGINEER ! end of coverpage abstract: line_1: This test will determine the optimal, non-standard discriminator thresholds line_2: for the few anomalous channels on each HRS detector. A 15 second flat field line_3: observation followed by a 210 second dark count is performed at each of 10 line_4: discriminator threshold values for each detector. The result of the test line_5: will be the optimal threshold values to be entered into the PDB. line_10: Edited 4/30/91 to add comments to disable/re-enable cross-talk tables. ! ! end of abstract general_form_proposers: lname: SKAPIK fname: JOE inst: STSCI country: USA ! lname: HULBERT fname: STEVE inst: STSCI country: USA ! lname: GILLILAND fname: RONALD mi: L. inst: STSCI country: USA ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: GHRS Objectives: line_2: 1. Determine the optimal discriminator thresholds for all non-standard line_3: detector channels. line_5: Discriminator thresholds are derived from PHA data. The line_6: standard algorithm sets the threshold at 50% of the energy of the line_7: peak of the photoelectron pulse height distribution. On each line_8: detector there are a few special and/or slightly noisy channels line_9: which require non-standard threshold values. This test calibrates line_10: the thresholds for those channels to allow for the maximum number line_11: of diodes to be available. ! question: 3 section: 1 line_1: The HRS is configured for high voltage operation on and the most line_2: recent, default thresholds are loaded and verified. Next, a 10 second line_3: flat field followed by a 210 second dark count are taken to verify default line_4: threshold performance. A series of 10 sets of flat field and dark count line_5: data are then acquired for thresholds of 35 through 80 by increments of line_6: 5. The PHA processor is used to load each set of thresholds. Finally, line_7: the side 2 default thresholds are reloaded. line_9: This is an internal test, and requires no special pointing of the line_10: telescope. ! question: 5 section: 1 line_1: This test should be scheduled to occur outside of the SAA. HST engineering line_2: telemetry must be available in realtime during this test, i.e., TDRSS must be line_3: visible. line_4: This test should be run once per year within 2 weeks after the execution of line_5: the PHA test, 2851. line_6: Prerequisites: line_7: 1. Proposal 2851, Pulse Height Analysis line_9: Scheduling Constraints: line_10: This test may be run in parallel with other SI tests. It should not be line_11: scheduled as an interleaver with other GHRS exposures. The individual line_12: segments of this test put thresholds in non-standard values, which are not line_13: reset until the end of the test, lines 19 and 35. ! question: 7 section: 1 line_1: Count rates during the dark and flat field exposures will be measured as line_2: functions of threshold level. Thresholds for the special channels will be line_3: derived which bring their response as close as possible to the mean of line_4: other channels. line_6: Unuseable channels will be entered in the flight software bad diode table line_7: and/or the cross-talk table. Noisy and anomalous channels will be line_8: identified in the data reduction software. line_9: The threshold load PLCP groups in the PDB will be updated with the results. ! question: 8 section: 1 line_1: This is an internal test and does not require any special pointing of the line_2: telescope. line_4: No target list is required. ! !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 phone: 301-338-4948 ! ! end of general_form_address records ! No fixed target records found ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE sequence_2: THRSHSET targname: INTFLAT config: HRS opmode: PULSE-HEIGHT aperture: NONE sp_element: # num_exp: 1 time_per_exp: 5S priority: 1 param_1: # req_1: SEQ 1-3 NO GAP comment_1: INTEGRATE PERIOD=5S, DO NOT RELOAD comment_2: THRESHOLDS ! linenum: 2.000 sequence_1: DEFINE sequence_2: THRSHSET targname: INTFLAT config: HRS opmode: PHOTOSCAN aperture: NONE sp_element: # num_exp: 1 time_per_exp: 10S priority: 1 param_1: TYPE=SHORT-Y, param_2: SPACING=16, param_3: X=2048,Y=2048 ! linenum: 3.000 sequence_1: DEFINE sequence_2: THRSHSET targname: DARK config: HRS opmode: PHOTOSCAN aperture: NONE sp_element: # num_exp: 1 time_per_exp: 210S priority: 1 param_1: TYPE=SHORT-Y, param_2: SPACING=0, param_3: X=2048, param_4: Y=2048, ! linenum: 20.000 targname: DARK config: HRS opmode: THRESHOLD sp_element: SAFE2 num_exp: 1 time_per_exp: 14M priority: 1 param_1: FUNCTION=BOTH, param_2: HIGH-VOLTAGE=ON req_1: GROUP 20.0-35.0 WITHIN 6H; req_2: CYCLE 2/20-35; comment_1: DISABLE CROSS-TALK TABLE ! linenum: 21.000 targname: INTFLAT config: HRS opmode: PHOTOSCAN aperture: NONE sp_element: SAFE2 num_exp: 1 time_per_exp: 10S priority: 1 param_1: TYPE=SHORT-Y, param_2: SPACING=16, param_3: X=2048,Y=2048 ! linenum: 22.000 targname: DARK config: HRS opmode: PHOTOSCAN aperture: NONE sp_element: SAFE2 num_exp: 1 time_per_exp: 210S priority: 1 param_1: TYPE=SHORT-Y, param_2: SPACING=0, param_3: X=2048, param_4: Y=2048, ! linenum: 23.000 targname: INTFLAT config: HRS opmode: PULSE-HEIGHT aperture: NONE sp_element: SAFE2 num_exp: 1 time_per_exp: 5S priority: 1 param_1: BEGIN=35, param_2: END=35, param_3: STEP=1 comment_1: INTEGRATE PERIOD=5S, DO NOT RELOAD comment_2: THRESHOLDS ! linenum: 24.000 targname: INTFLAT config: HRS opmode: PHOTOSCAN aperture: NONE sp_element: SAFE2 num_exp: 1 time_per_exp: 35S priority: 1 param_1: TYPE=SHORT-Y, param_2: SPACING=16, param_3: X=2048,Y=2048 ! linenum: 25.000 targname: DARK config: HRS opmode: PHOTOSCAN aperture: NONE sp_element: SAFE2 num_exp: 1 time_per_exp: 210S priority: 1 param_1: TYPE=SHORT-Y, param_2: SPACING=0, param_3: X=2048, param_4: Y=2048, ! linenum: 26.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=40, param_2: END=40, param_3: STEP=1 ! linenum: 27.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=45, param_2: END=45, param_3: STEP=1 ! linenum: 28.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=50, param_2: END=50, param_3: STEP=1 ! linenum: 29.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=55, param_2: END=55, param_3: STEP=1 ! linenum: 30.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=60, param_2: END=60, param_3: STEP=1 ! linenum: 31.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=65, param_2: END=65, param_3: STEP=1 ! linenum: 32.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=70, param_2: END=70, param_3: STEP=1 ! linenum: 33.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=75, param_2: END=75, param_3: STEP=1 ! linenum: 34.000 sequence_1: USE sequence_2: THRSHSET sp_element: SAFE2 param_1: BEGIN=80, param_2: END=80, param_3: STEP=1 ! linenum: 35.000 targname: DARK config: HRS opmode: THRESHOLD sp_element: SAFE2 num_exp: 1 time_per_exp: 14M priority: 1 param_1: FUNCTION=BOTH, param_2: HIGH-VOLTAGE=ON comment_1: RE-ENABLE CROSS-TALK TABLE ! ! end of exposure logsheet ! No scan data records found