26-03-2018, 05:02 PM
Very nice indeed, Guy. As I said in my previous post I did very little to the IBA graticule, although it seems to be lacking the zero and decimal point for the 0.3V sync level.
I'm puzzled by some of the markings on those BBC graticules, though. The IBA one correctly shows modulation level with peak white at 20% and the sync tips at 100% for use with a demodulator and black level at 0.3V with peak white at 1V for video measurements, but both BBC examples show black level as 0% and peak white as 100%. One of them also shows modulation levels with peak white correctly at 20% but black level at 100%!
Can somebody pleas explain these inconsistencies because they simply do not make sense to me!
I'm puzzled by some of the markings on those BBC graticules, though. The IBA one correctly shows modulation level with peak white at 20% and the sync tips at 100% for use with a demodulator and black level at 0.3V with peak white at 1V for video measurements, but both BBC examples show black level as 0% and peak white as 100%. One of them also shows modulation levels with peak white correctly at 20% but black level at 100%!
Can somebody pleas explain these inconsistencies because they simply do not make sense to me!
