Changes between Version 7 and Version 8 of Gizmo Delay Check


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Timestamp:
Apr 10, 2014, 12:26:30 PM (11 years ago)
Author:
James
Comment:

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  • Gizmo Delay Check

    v7 v8  
    1111Should be able to use coarse settings to get within 17.8 ps of target time, then can use fine setting with approximate step size of 11.1 fs.[[BR]]
    1212
    13 == History: Coarse Setting Before Fix ==
    14 In original code, coarse settings above 127 were bit-masked with 128 and settings above 255 with 128 and 256.[[BR]]
    15 This showed the strange behaviour in the plot below, which was fixed when the bit-masks were swapped over.[[BR]]
    16 In range before coarse setting of 128 measure 17.62 +/- 0.02 ps in good agreement.[[BR]]
    17 However, there is unexpected behaviour after 128 where we see a big drop in delay and then a step size of 36.39 +/- 0.06.[[BR]]
    18 At 256, it then realigns itself with the expected behaviour. Red and green lines were taken at different times.[[BR]]
    19 [[Image(measureDelay.png)]]
    20 
    2113== History: Delays Before Fix ==
    2214In original code, all signals from parallel port were opposite of what they should've been (i.e. positive going should have been negative going).[[BR]]