Rev 01 02 03 ECO 32 248 32 249 32 250 Description Use for SN2 Thermal Vacuum testing Adjustments based upon use Add reset of cal rate at end Author RFGoeke RFGoeke RFGoeke Approved Date 9 27 07 9 29 07 10 1 07 CRaTER Short Form Functional Test Procedure in Thermal Vacuum Dwg No 32 06003 0201 Revision 03 October 1 2007 Serial No 32 06003 0201 Date Page 1 of 12 Revision 03 Table of Contents PREFACE 3 1 INTRODUCTION 4 2 REQUIREMENTS 5 3 CONFIGURATION 6 4 PROCEDURES 7 4 1 Identification of Test Environment 7 4 2 Identification of Equipment and Personnel 7 4 3 Configure the EGSE 8 4 4 Verify Initial Instrument State 8 4 5 Turn Detector Bias On 10 4 6 Initiate the Internal Calibration Signal 11 4 7 Check Detector Noise Levels 11 32 06003 0201 Page 2 of 12 Revision 03 Preface Revision 01 of the parent 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 60Co source permanently sitting on top of the telescope Revision 02 allowed for variations which occurred at 40C The dosimeter output is drifting by a bit or so and it is collecting a few counts from the 60Co source the singles counts are not well behaved decided to ignore those altogether and the noise statistics are getting worse Revision 03 reset the cal rate to 8Hz at the end of the procedure 32 06003 0201 Page 3 of 12 Revision 03 1 Introduction Same as parent document 32 06003 0201 Page 4 of 12 Revision 03 2 Requirements Same as parent document 32 06003 0201 Page 5 of 12 Revision 03 3 Configuration Same as parent document 32 06003 0201 Page 6 of 12 Revision 03 4 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 or an instruction to send a command acknowledge 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 4 1 Identification of Test Environment Procedure requiring this test 4 2 Location of Test Environment Date Identification of Equipment and Personnel Flight Instrument 32 10000 S N Spacecraft Simulator 32 80201 S N Test Conductor QA Representative Other Individuals 32 06003 0201 Page 7 of 12 Revision 03 4 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 4 4 Verify Initial Instrument State Turn on DC power supply and verify proper instrument initialization as follows or if the instrument is already powered issue the following command Command Function Reset Value n a Sent Verify that the time displayed in either the CRaTER Analog House and CRaTER Command widows is consistent with wall time and is incrementing every second Time and Date displayed Initial Verify that the time string displayed is not preceded by One Hertz which would indicate a failure of the instrument to receive the 1 Hz tick from the spacecraft simulator on J1 Check absence of One Hertz display Initial Record the serial number of the unit under test as displayed at CRaTER Command window Instrument Serial Number Initial Read record and verify the state of the instrument command tell tales the current state is highlighted in the display Group HV Bias From command tcl Command Value On Off Expected Off Calibrate Low Off High Off Rate 8 Hz D1 On D2 On D3 On D4 On D5 On D6 On Processing 32 06003 0201 Page 8 of 12 OK Revision 03 Read record and verify the nominal housekeeping values recorded by the instrument Note that the PRT is read out with an ohmmeter Group Bus Voltages Measurement 28VDC Bus 5 Digital From house tcl Value Units 5 Analog volts 5 Analog Expected 21 35 5 0 0 1 OK 5 0 0 1 5 0 0 1 Total Power 28VDC Bus Bias Current D1 Watts D3 5 8 0 1 D5 amps D2 D4 0 40 at 25C D6 Bias Voltage Thin volts Thick Thresholds Cal Amplitude Thin LLD Temperatures 2 5 1 0 01 volts 0 048 0 001 Thick LLD 0 048 0 001 Telescope Ambient Analog Board Ambient Digital Board Ground Test 2 5 1 C Ambient DC DC Supply Ambient Bulkhead Ambient PRT Temp ohms Ambient Time Completed 32 06003 0201 Page 9 of 12 Initial Revision 03 4 5 Turn Detector Bias On Command Function Detector Bias Value ON Sent Read record and verify the following Note that with the detector bias on we are detecting the 60Co source which is why the particle counts are not zero in channels D2 D4 and D6 Group HV Bias Command On Off Voltage Thin From command tcl Value Units na Voltage Thick volts Current D1 Current D5 0 1 at 40C 2 0 at 25C 8 0 at 40C Current D4 Current D6 Particle Counts Good Reject na 3 0x1000 na 4 0 Total Group Total Power 32 06003 0201 220 10 amps Current D2 Echo OK 0 01 at 40C 0 1 at 25C 0 4 at 40C Current D3 System Expected On 75 10 4 From house tcl Measurement Value 28VDC Bus Page 10 of 12 Expected 5 8 OK Revision 03 4 6 Initiate the Internal Calibration Signal Command Function Cal Amplitude Value 128 Sent Read record and verify the following From command tcl Command Value Amplitude Group Calibrate Command Function Cal Low Value ON Expected 2 048 0 024 OK Sent Read record and verify the following From command tcl Item Min Value Good Group Particle Counts 4 7 Expected 8 Reject 0 Total 8 OK Check Detector Noise Levels Command Function Cal Rate Value 2KHz Sent read record and verify the following using the program sf noise Detector D1 D2 D3 D4 D5 D6 Command Mean From Statistics window Expected Sigma 216 16 Function Cal Rate Value 8Hz Expected 5 Sent Time Completed 32 06003 0201 Page 11 of 12 OK Initial Revision 03 32 06003 0201 Page 12 of 12 Revision 03
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