Operating Manual for LBNL ATLAS SCT Electrical Tests 2004

Setup

Hybrids

Modules

Running the tests on hybrids or modules

Make sure that the VME crate is powered on. If it is not, turn it on before connecting the hybrid or module. And don't forget to run TM explorer to initialize the VME crate.
Install devices as described above.
Make sure that the dry air is flowing.
Turn on chiller. More information on specific chillers.
• Note: Be extremely cautious to only open a hybrid testing fixture if you are sure that the temperature is above 17^oC. If the fixture is opened while the temperature inside is 17^oC or less, condensation may damage the hybrid.
• For the hybrid room temperature tests, the chiller should be set at approximately 19^oC to obtain a thermistor temperature of about 23^oC.
• For the warm hybrid longterm burn-in, the chiller dial should be set to about 37^oC to obtain the same temperature on the hybrid thermistors.
• For the cold hybrid longterm burn-in, the chiller dial should be set to about -8.5^oC to obtain a thermistor reading of 0^oC. When any hybrid is at a temperature less than 27^oC, the LV will add about 5^oC to the thermistor reading. Due to continuous evaporation of water and coolant from chiller reservoir baths, their performance will drift with time. Hence, some experimentation with chiller temperature setting is often necessary to achieve the desired thermister setting.
• For the module room temperature tests, first set the chiller to 15^oC and run the IVcurve with LV OFF and HV RAMP DOWN. In these conditions, the modules should have a thermistor temperature of about 15^oC. When the IVcurve test is finished, LV is automatically on, and HV is already ramped up to 200V. The thermistors should now be allowed to settle to about 26^oC before running the Characterisation test. Here's a description of Module Initial Testing, and how to Condition a Module. When this test is done, HV RAMP DOWN and LV OFF before exiting ST.
• For the module longterm test, the module box should be placed in the environmental chamber set to -14^oC for chamber 1 and -18^oC fro chmaber 2 to obtain a thermistor measurement of 0^oC. This may need trial and error with more than one module. Please update this site when the correct temperature settings are discovered!
In the folder D:\sctvar\config, check that the st_system_config.dat file defines the correct modules/hybrids. System configuration instructions.
In the same directory, check that the proper .det files exist for the hybrids/modules under test. Especially if the hybrid has a chip with LGS. For hybrids, we will use default.det file for simplicity. However each module needs its own specific .det file where we list the capacitor factors for each chip. Make sure that the .trim and .mask files do not exist unless they are specifically required. (Note: the .trim and .mask files will not be needed under normal testing circumstances) Specific configuration instructions.
Run the testing software (ST.bat icon on the top-left corner of the desktop). Enter 'ASC' for a user name.
Check that the power has come on and that the temperatures and currents are at the appropriate levels on the Burst Display window. (Idd ~560/590 mA, Icc ~980/1100 mA for hybrids/modules. Idet = 0 for hybrids and should be < 5 mA for modules.) If no tests are running, the numbers are updated every 10 seconds via the BURST display window.


For module testing, the IV Curve is run with LV off, and the chiller set to 15^oC. Ramp Up with option 4 - 500V in 25V steps and return to 200V when completed for the IV Curve. If the module has a micro-discharge continue with the test don't condition it, all conditioning is done down stairs now. However, if the micro-discharge was so great that the HV tripped and returned to 0V (instead of 200V) then you tell someone and  When the IV Curve is complete, leaving low voltage on and HV at 200V, run the Characterization Test. For a detailed description of this step see Module Initial Testing
Start the appropriate testing sequence. For the Characterisation Test, use a scope to answer the Hard Reset test questions. (Note: due to windows bugs, you must enter space 1 to answer "yes" to the Hard Reset test questions).
All other tests continue without intervention. The Characterisation Test takes a total of about one hour per hybrid or module to complete. For 6 hybrids/modules the test can take all day. The longterm tests currently take 90h for warm hybrids plus 10h for cold hybrids; and 24h for modules, although these times will be reduced with experience among the SCT community. Description of the electrical tests.
Monitor the tests while they are running to catch any program crashes as soon as possible. General information about the testing software and Electrical Test Specifications (Testing Manual)
All results files should be archived and transfered immediately after completion of the tests to maintian the website in a timely fashion. Here's what to do When the Tests Finish .
Check that the hybrid/module passed each test in the results text file (serialnumber_date.txt) and that the ps files look appropriate. How to analyze results. Then update the appropriate online summaries including the Progress Summary if necessary and the Test and Channel Summary.
If you want to compare the resulting hybrid data to the wafer data, follow these instructions.
Shut down the software by first clicking the "LVOff" button, and then use the ".q" command. Sometimes this doesn't exit the software completely and the ".q" command must be used a second time.


When sctdaq has exited, check that the LV and HV power lights are off. If they are not, restart the software and immediately "Exit" again. This should turn off the power correctly.
Turn the chiller off, taking care to keep the module in a dry air environment until it reaches room temperature to avoid any danger of condensation. This means that, unless you are certain that the hybrid/module is at least 19^oC, you should never open a hybrid fixture or stop the circulation of dry air in a module container. If you do remove a hybrid/module from dry air circulation, (which would of course be at least 19^oC), then go to the next step:
Disconnect devices under test; put the hybrid/module in the dry air cabinet for safe keeping.
Record in the logbook every test for each hybrid/module; include time started and time completed. Be sure to include any comments about unusual events or results, including crashing software and any retests. Update "Test_and_Channel_Summary.xls" and "Testing_Checklist.xls" on stsdaq3 (Desktop/Channel Stuff), and upload "Test_and_Channel_Summary.xls" to pxs. Move the appropriate magnet on the board to the next square. Again, make sure that the results have been properly uploaded to the website (step 14).