Thermal Vacuum Chamber - Gravity Probe B
Contents
1. Make sure that the bleeder valve located on the left side of the Chamber base is closed Turn on the pump switch located on the front control panel of the TVAC Chamber The chamber has a huge volume at least 15 minutes will elapse before the cold cathode display will read out a pressure A pressure of 104 mbar is sufficient for this test Ensure that a full dewar of liquid Nitrogen is attached to the chamber LN port located on the right side of the Chamber base and that the valve is open Turn on the Cold and Heater switches also located on the front panel of the TVAC Chamber Program the RC 900 Temperature controller located on the front of the front of the TVAC Chamber control panel with the following Temperature profile Step 1 Set Temp 100 C ramp rate 1 C min Step 2 Soak for 2 hours Step 3 Set Temp 40 C ramp rate 1 C min Step 4 Soak for 1 hour Step 5 Set Temp 60 C ramp rate 1 C min Step 6 Soak for 2 hours Step 7 Jump Step 1 Jump Count 2 Step 8 End See appendix A for detailed programming instructions for the RC 900 Controller and refer to the Operational Manual for the RC 900 Controller if necessary See Appendix B for a graphical representation of the above profile Test Software Boot up the PC located next to the TVAC Chamber Run the COMM6 software located in the COM6 directory 10 2 1 Check that the software is properly configured Under the File menu click the Port Settings2. option The baud rate should be 9600 The port should be 1 In the Command Center see Figure 1 The Device Address should be set to 1 and the Modbus Protocol box should be selected 10 2 1 1 Check to see if the RC 900 Controller is communicating with the software Click the Smart Hex box under Data Format Read for Command Type enter a 1 for Start Register and Number of Registers then click the Send Command buiton If the software is properly configured you will see a 11 in the Command History window The value returned in the Command Response window should be equal to the current temperature shown in the upper readout of the RC 900 Controller Page 4 of 8 Command Center a Data Logging 10 2 1 1 1 10 2 1 1 2 P0699 Rev April 19 2000 Pa ES Figure 2 COMM6 Data Logging Window Under the OPTIONS menu click on the DATA LOGGING option In the DATA LOGGING window see Figure 2 click the Log to File box the Single Line box Change the file name to C COMM6 Whatever DAT Since COMM6 is an old program file names are limited to eight characters File Name The RC 900 Controller stores the current temperature in register 1 and the set temperature in register 7 In the DATA LOGGING window right click Page 5 of 8 P0699 Rev April 19 2000 on the Device Address column and enter a value of 1 Double click on the Register 1 column and enter a value of 1 Double
3. P0699 Rev April 19 2000 W W Hansen Experimental Physics Laboratory STANFORD UNIVERSITY STANFORD CALIFORNIA 94305 4085 Gravity Probe B Relativity Mission CERTIFICATION PROCEDURE FOR THE GYROSCOPE SUSPENSION SYSTEM GSS THERMAL VACUUM CHAMBER GP B Procedure P0699 Rev Prepared by Paul Shestople Date RE Global Positioning System GPS Group Approved by William J Bencze Date RE Gyroscope Suspension System GSS Group Approved by Dorrene Ross Date GP B Quality Assurance P0699 Rev April 19 2000 Table of Contents 1 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 Revision History Scope Reference Documents Test Facilities QA Provisions Test Personnel General Instructions Test Equipment Pre test Visual Inspection 10 0 Test Procedure 11 0 Completion of Procedure 12 0 Appendix A Programming the ESS RC 900 Controller 13 0 Appendix B Temperature Profile Graph Revision History Comments notes Revised By pe First release of this test procedure 3 Mar 00 P Shestople 2 0 Scope This procedure details the tests required to perform the certification process for the Thermal Vacuum Chamber 3 0 Reference Documents 3 1 Environmental Stress System Inc Operational Manual for RC 900 Controller 3 2 Watlow Controls Series 97 User s Manual 4 0 Test Facilities TVAC Chamber Laboratory HEPL Room 175 Stanford University 5 0 5 1 QA Provisions This procedure shall be c
4. click on the Register 2 column and enter a value of 7 Use the arrows to select 30 seconds for the Logging Interval 10 2 1 1 3 Once you have verified that the TVAC Chamber is under vacuum begin data logging by selecting the Begin Data Logging option under the Options menu 10 3 Begin the temperature profile by pressing the Start Stop button on the RC 900 Controller 10 4 During the certification run check the equipment periodically to ensure proper operation The LN dewar may need to be changed after the second cycle 10 5 After the certification run graph the data from the COMM6 data logger and attach the graph to this PDOC 10 6 Check the temperature alarm controllers as follows While data logging enter a temperature of 75 C into the RC 900 Controller Monitor the chamber during this test When the temperature of the chamber falls below 70 C the alarm should activate and the temperature should stop decreasing Allow the test to proceed for ten minutes after the alarm has been activated Record this test results below File Name Temperature at which alarm sounded Did temperature stop decreasing Graph the data from the COMM6 data logger Attach the graph to this PDOC 11 0 Completion of Procedure The completed procedure should be composed of this PDOC and both successful data graphs The procedure is considered complete when all the data has been graphed and reviewed by the test engineer and the QA representative The r
5. eviewers should look for temperature difference greater than 10 between the actual temperature and the set temperature during ramping Once the actual temperature has reached the soak temperature and during the soak the actual temperature should never deviate from the soak temperature by more then two degrees The alarm data is considered successful if it is clear that the temperature controller shut down after alarm activation certify that the this procedure was performed in whole and that the data recorded above and included is complete and accurate Test Engineer Date This is to certify that the information obtained under this test procedure is as represented and the documentation is completed and correct GP B Electronics Date Manager Quality Date Assurance Page 6 of 8 P0699 Rev April 19 2000 12 0 Appendix A Programming the ESS RC 900 Controller Please refer to the ESS Operation Manual for RC 900 Controller for additional comments 13 1 Figure 3 ESS RC 900 Temperature Controller Front Panel Depress the Menu button on the front panel of the controller Depress the Down arrow until Pro9 appears in the upper display Press the Menu button again StEP will be displayed in the lower display Press the Up or Down arrow until 1 appears in the upper display You are now ready to program the RC 900 Controller The following commands can be accessed by pressing the Menu button the command ap
6. onducted on a formal basis to its latest approved and released CON O A WWW WwW PDYP PY YK DYN PD version The QA Program Engineer D Ross or their designated representative and ONR shall be notified 24 hours prior to the start of this procedure QA may monitor the execution of all or part of this procedure should they elect to do so Page 2 of 8 P0699 Rev April 19 2000 5 2 Upon completion of this procedure the GSS manager and the GP B QA manager shall certify her his concurrence that the procedure was performed and accomplished in accordance with the prescribed instructions by signing and dating their approval at the end of this procedure 6 0 Test Personnel This test procedure is to be conducted only by the following certified personnel or their designated representatives 6 1 William Bencze 6 2 Paul Shestople 7 0 General Instructions Tals Redlines can be initiated by the certified test personnel listed in Section 6 0 and must be approved by QA 7 2 Test operators shall read this procedure in its entirety and resolve any apparent ambiguities prior to beginning this test 7 3 Any nonconformance or test anomaly should be reported by a Discrepancy Report Refer to the Quality Plan P0108 for guidance Do not alter or break test configuration if a test failure occurs notify quality assurance 7 4 Only the following persons have the authority to exit terminate this test or perform a retest Certified test operat
7. ors listed in Section 6 0 and GP B QA 8 0 Test Equipment The following support hardware test equipment or software will be used and the applicable information for the instruments shall be recorded below Hand written additions to this list may be made in the spaces provided Equipment Description ee Calibration 1 GSS Thermal Vacuum Chamber Stanford 02589 RC 900 Temperature Controller ESS RC 900 981S22CCCUEP Temperature Controller Alarm 1 Watlow Series 97 001709 Temperature Controller Alarm 2 Watlow Series 97 001710 Pressure Readout Varian CC2C LIL80064 2 PC Computer 00895 COMME Software E S a 3 3 Serial Cable Cable 9 0 Pre test Visual Inspection 9 1 Verify that all equipment inside the TVAC chamber is temperature resistant from 60 C to 100 C Page 3 of 8 9 2 9 3 10 0 10 1 10 2 P0699 Rev April 19 2000 Inspect the TVAC Chamber Dome O ring for damage and proper lubrication use approved vacuum grease for lubrication Inspect the O ring mating surface for cleanliness and clean with isopropyl alcohol or ethanol if necessary Check all cables for damage and strain relief Ensure that a serial cable is connected from the TVAC Chamber front control panel to the PC serial port and that the rocker switch on the front panel of the TVAC Chamber control panel is in the RS232 position Test Procedure TVAC Chamber 10 1 1 10 1 2 Begin the procedure by closing the TVAC Chamber Dome
8. p 3 should now be shown in the upper display Menu Up arrow until StPt is shown in the upper display Menu Use the arrow buttons to change the value of the upper display to 40 Menu Use the arrows to change the value of the upper display to 1 Menu Up You are now in Step 4 Menu Use the arrows until SOAH is displayed in the upper display Menu Change the value of the upper display to 1 thus programming the controller to soak for 1 hour Menu Menu Menu Up 5 should now be shown in the upper display Menu Up arrow until StPt is shown in the upper display Menu Use the arrow buttons to change the value of the upper display to 60 Menu Use the arrows to change the value of the upper display to 1 Menu Up You are now in Step 6 Menu Use the arrows until SoAH is displayed in the upper display Menu Change the value of the upper display to 2 thus programming the controller to soak for 2 hours Menu Menu Menu Up 7 should now be shown in the upper display Menu Menu Use the arrows to change the value of the upper display to 1 Menu Use the arrow buttons to change the value of the upper display to 2 Menu Up Menu Menu Use the arrow buttons to change the upper display to OFF VIEW Press the START STOP bution twice to begin the profile The profile may be stopped at any time by pressing the START STOP menu once 13 0 Appendix B Temperature Profile Graph T VAC Chamber Certification Test Tempera
9. pears in the lower display use the Up and Down arrows to change the value of the upper display Press the Menu button to access the sub commands StyP Set Type the main command which allows access to all the following commands StPt This command allows a set point to be entered SP Set Point enter a value between 75 C and 100 C rAtE Ramp Rate in degrees per minute SOAH Soak time Hour hours Min minutes Sec seconds JMP This command is used to repeat previous step This is the only command type used in step 7 JStP Specifies the Jump to Step number 1 through 6 JCnt Specifies the number of times the controller will jump to the jump step End Step 8 is the final step and is always END HoLd Commands the RC 900 to hold the final SP OFF Turns the RC 900 Controller off Page 7 of 8 P0699 Rev April 19 2000 13 2 For the Certification Run profile used in this procedure and shown graphically in Appendix B enter the following information Menu Down until Pro9 appears in upper display Menu Arrow until 1 appears in upper display Menu Menu Use the Up button to change the value of the upper display to 100 Menu Use the arrows to change the value of the upper display to 1 Menu Up You are now in Step 2 Menu Use the arrows until SOAH is displayed in the upper display Menu Change the value of the upper display to 2 thus programming the controller to soak for 2 hours Menu Menu Menu U
10. ture C NO 0 500 1000 1500 2000 Time minutes Figure 4 Temperature Profile Graph Page 8 of 8
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