The measurement is done with Histogram option on Oscilloscope (5G/s) and MPD(jittertime=). 
The polarisation of pump beams H and V  and for signal and idler arms are projected on  H and QWP at 18.7 degree The polarisation of pump beams LR and for signal and idler is L and R respectively. (with QWP motor at 250, 13.3 steps is 1 degree).