CRaTER Short Form Functional Test Procedure in Thermal/Vacuum. Dwg. No

Transcription

1 Rev. ECO Description Author Approved Date Use for SN2 Thermal-Vacuum testing RFGoeke 9/27/07 CRaTER Short Form Functional Test Procedure in Thermal/Vacuum Dwg. No Revision 01 September 27, 2007 Serial No Date: Page 1 of 8 Revision 01

2 Table of Contents 1 PROCEDURES Identification of Test Environment Identification of Equipment and Personnel Configure the EGSE Verify Instrument State Turn Detector Bias Initiate the Internal Calibration Signal Check Detector Noise Levels Clean Up and Shut Down...8 Preface Revision 01 of the parent Short Form Functional Rev. B is tuned for use during Thermal- Vacuum testing to account for a) the lack of PRT feedback into the instrument telemetry stream; and b) the presence of a 60 Co source permanently sitting on top of the telescope. For Introduction, Requirements, Configuration, and Test Failure instructions, see the parent document Page 2 of 8 Revision 01

3 1 Procedures Space is provided for the recording of information of particular significance in the conduct of this test. Where a value simply needs to be verified, as opposed to recorded, a simple check mark will suffice. In addition the Test Conductor may redline the procedure to more accurately document the actual flow of events, both routine and anomalous. The pages of this section will be attached to the Test Report that is filed each time this activity is conducted. The telemetry data stream generated by the spacecraft simulator is also an integral part of the Test Report; that data is archived on crater.bu.edu. 1.1 Identification of Test Environment Procedure requiring this test: Location of Test Environment Date: 1.2 Identification of Equipment and Personnel Flight Instrument, Spacecraft Simulator, S/N S/N Test Conductor QA Representative: Other Individuals: Page 3 of 8 Revision 01

4 1.3 Configure the EGSE We assume that sf_log and sf_noise as well as CHouse and CCmd are running on the test console. If not, refer to the parent Short Form Functional for instructions. 1.4 Verify Instrument State Turn on DC power supply and verify proper instrument initialization as follows. Verify that the time displayed in both the CRaTER Analog House and CRaTER widows is consistent with wall time and is incrementing every second. Time and Date displayed Verify that the time string displayed is not preceded by /e Hertz/, which would indicate a failure of the instrument to receive the 1 Hz tick from the spacecraft simulator on J1. Check absence of /e Hertz/ display Record the serial number of the unit under test, as displayed at the bottom of the house.tcl display. Instrument Serial Number Read, record, and verify the state of the instrument command tell-tales (the current state is highlighted in the display. From command.tcl Group Value Expected OK? HV Bias /Off Off Calibrate Processing Low High Rate D1 D2 D3 D4 D5 D6 Off Off 8 Hz Page 4 of 8 Revision 01

5 Read, record, and verify the nominal housekeeping values recorded by the instrument. Note that the PRT is read out with an ohmmeter. From house.tcl Group Measurement Value Units Expected OK? Bus Voltages 28VDC Bus Digital 5.0± Analog volts 5.0±0.1-5 Analog -5.0±0.1 Total Power 28VDC Bus Watts 5-8 Bias Current Bias Voltage Thresholds Temperatures Dosimeter D1 D3 D5 D2 D4 D6 µamps <0.1 <0.40 at 25C Thin 2.5±1 volts Thick 2.5±1 Cal Amplitude <0.01 Thin LLD volts 0.048±0.001 Thick LLD Telescope Analog Board Digital Board DC-DC Supply Bulkhead C 0.048±0.001 Low mrad <0.1 Medium mrad <0.1 High Rad <0.1 Ground Test PRT Temp. ohms Time Completed Page 5 of 8 Revision 01

6 1.5 Turn Detector Bias Function Detector Bias Value ON Read, record, and verify the following. Note that, with the detector bias on, we are detecting the 60 Co source which is why the particle counts are not zero in channels D2, D4, and D6. From command.tcl Group Value Units Expected OK? HV Bias /Off na Voltage Thin 75±10 Voltage Thick volts 220±10 Current D1 Current D3 Current D5 Current D2 Current D4 Current D6 µamps <0.1 at 25C <3.0 at 25C System Echo na 3 : 0x1000 Singles Rates Particle Counts D1 D2 D3 D4 D5 D6 na <5 Good <4 Reject na 0 Total <4 From house.tcl Group Measurement Value Expected OK? Total Power 28VDC Bus Page 6 of 8 Revision 01

7 1.6 Initiate the Internal Calibration Signal Function Value Cal Amplitude 128 Read, record, and verify the following From command.tcl Group Value Expected OK? Calibrate Amplitude 2.048±0.024 Function Cal Low Value ON Read, record, and verify the following. From command.tcl Group Item Min. Value Expected OK? Particle Good 8 Counts Reject 0 Total Check Detector Noise Levels Function Cal Rate Value 2KHz Read, record, and verify the following using the program sf_noise From Statistics window Detector Amplitude Expected Noise Expected OK? D1 D2 D3 D4 D5 D6 216±16 < Page 7 of 8 Revision 01

8 1.8 Clean Up and Shut Down Function Reset Value n/a Read, record, and verify the following From house.tcl Group Measurement Value Expected OK? Total Power 28VDC Bus 5-8 Bias Voltage Thin 2.5±1 Thick 2.5±1 ly if no further testing is to be performed immediately Turn off GSE 28VDC power supply and Spacecraft Simulator Close the telemetry archive file and upload the file to the CRaTER engineering web site: Time Completed Page 8 of 8 Revision 01