yes,damian,i found that if i change the sample rate,the h range and mean value and standard deviation will have litter difference.however,if the sample rate is high,the histogram will be centered well,so i think more higher sample rate,more accurate jitter! is it right?
2、i am still confused about the effect between jitter and bit rate.as we know，more higher bit rate,more higher jitter.however,when i test it in optisystem,it is not the same.for example,if i set the bit rate 100Mbps,10M and 1M,the jitter(h range:0.00299 bit period) will be almost the same when they do not multiply the bit period.so when the multiply the bit period,the jitter will have different order of magnitude.for example,1M:0.00299*1us=2.99ns ； 10M：0.00299*0.1US=0.299ns;100M:0.00299*0.01US=0.0299ns.it should not be that?