To show the calibration group how to analyze duotone, I looked at the IOP channel for the duotone input of the first LSC ADC card (the same card that is used for OMC DCPD).

Nothing is automated yet (that's for Sudarshan), I just used dtt to access 64kHz IOP channel, took 2 sec of time series, exported it to text, and used matlab to analyze.

According to my script the delay is 7.3us (i.e. the duotone second boundary is 7.3us behind the digital world second boundary).

The medm screen for each IOP has a simpler duotone timing monitor and it is reporting 5us delay instead of 7 (see attached). I don't know where that descrepancy comes from. I know that the number the medm screen is reporting comes from a simple zero-crossing calculation at around the second boundary, but even when you look at the zero-crossing, it looks more like 7us than 5 (second attachment).

Tomorrow we'll do the loopback duotone test for pcal and ETM SUS.