Difference: AMC13DebugLog (50 vs. 51)

Revision 5112 Jun 2013 - DavidZou

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META TOPICPARENT name="CmsSlhc"
Please log AMC13 test activity below, blog style (new entries at top)
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2013-06-12 dzou

  • Additional test runs made for investigating clock phase shift:
    • Made initial test run after over night power off (~16 hours)
    • Made three test runs w/ 10s power off and then one test run for various times of power off: 1, 2, 5, 10 mins (see below).
    • Data in Sheet 2 of: ClockPhaseShift.xlsx
    • ClockPhaseShift.pdf (pg 3 and 4)
  • Observations not included in test runs:
    • Phase shift after 1 hour of power on: 4.524
Plot of clock phase at various power off times
 

2013-06-11 dzou, hazen

  • Measuring TTC Clock Phase Shift - Notes on Setup:
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  • Agellant AWG 40 MHz 90mV peak to peak output
  • AWG connect by 2 ft onto T on channel 4 of oscilloscope
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    • Using Agellant AWG 40 MHz 90mV peak to peak output as external clock
    • AWG connect by 2 ft onto T on channel 4 of oscilloscope (LeCroy 725 ZI 2.5 GHz)
 
  • 4ft long cable from T to external clock to TTT
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  • D310 differential probe solder to FClkA on AMC13 at backplane connector w/ 100 ohm between the pair
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    • D310 differential probe soldered to FClkA on AMC13 at backplane connector w/ 100 ohm between the pair
 
  • AMC13 receiving clock is in slot 8 (SN 43)
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* SN AMC13 40, 4ft duplex fiber to B c hann of TTT * Oscilloscope: LeCroy 725 ZI 2.5 GHz
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    • SN 40 in AMC13 with 4ft duplex fiber to B chann of TTT
 
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* saved oscilloscope screen shot clocks2.jpg 4.47 ns (after being turned on for a while, before any power cycling) * Cycling handle power of Amc13 that is providing clock (SN 40) - power down for 30 secs - 4.34 ns (clocks3.jpg)
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  • Saved oscilloscope screen shot clocks2.jpg 4.47 ns (after being turned on for a while, before any power cycling)
  • Cycling handle power of AMC13 that is providing clock (SN 40) - power down for 30 secs (phase at 4.34 ns) (clocks3.jpg)
 
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