FA125 Data Format July 7, 2015

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Location and Time

Room: CC F326???

Time: 2pm.

Remote Connection

You can connect using BlueJeans using the meeting number 589 693 655 .       (Click "Expand" to the right for more details -->):

(if problems, call phone in conference room: 757-269-6460 might not be the correct number)

  1. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 589693655.
  2. To join via a Web Browser, go to the page [1] https://bluejeans.com/589693655.
  3. To join via phone, use one of the following numbers and the Conference ID: 589693655
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560

More information on connecting to bluejeans is here

Specific instructions for connecting via polycom:

  • Turn polycom on if necessary
  • With the polycom, place a call at 199.48.152.152
  • Press # to enable the polycom keypad, then enter the meeting id: 589693655 and #
  • You may have to unmute the microphone: #*4
  • Turn the computer on if needed

Agenda

0: block header
1: block trailer
2: event header
3: trigger time
4: pulse data, CDC format
5: pulse data, FDC format (integral and time)
6: pulse data, FDC format (peak amplitude and time)
7: pulse data and raw samples, CDC format
8: pulse data and raw samples, FDC format
9: – unused –
10: – unused –
11: – unused –
12: – unused –
13: event trailer (debug only)
14: data not valid (empty module)
15: filler (non-data) word
  • ADC modes (pdf)
  • Integration starts with sample containing leading edge time 
IE = end of integration, number of samples included, starting with pulse leading edge
Leading edge sample is int(t/10.0) where t=time returned in units of sample/10.
The integral ends at the earlier of WE or leading edge + IE.
If int(time/10.0) <= WE-IE, then the number of samples in the integral is IE.
If int(time/10.0) > WE-IE, then the number of samples in the integral is WE-int(time/10.0)+1.

eg
IE=14 WE=44 time=42.5, integral runs from samples 42 to 44 inclusive, 3 samples.
IE=14 WE=44 time=22.5, integral runs from samples 22 to 22+14=36 inclusive, 15 samples.
IE=14 WE=44 time=21.0, integral runs from samples 21 to 21+14=35 inclusive, 15 samples.

IE=200 WE=100 time=42.5, integral runs from samples 42 to 100 inclusive, 59 samples.
IE=200 WE=100 time=99.0, integral runs from samples 99 to 100 inclusive, 2 samples.
  • Time algorithm error conditions (overflow samples are now set to 4095 and then treated normally)
    1. ADC value of 0 anywhere in NSAMPLES buffer: q=1, t=10*TC-RT
    2. ADC value > LIMIT_PED_MAX (511) in 0 to PED_SAMPLE: q=1, t=10*TC-RT
    3. All ADC values in buffer < high timing threshold: q=1, t=10*TC-RT
    4. Low timing threshold found at TCL but too late in buffer to upsample: q=1, t=10*TCL+5
    5. Any upsampled value < 0: q=1, t=10*TCL+5
    6. Low timing threshold not found in upsampled data: q=1, t=10*TCL+9
  • Diagrams

Useful Links

Minutes

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