Hey,
We need to measure duty cycle distortion (DCD) of one clock related to other clock with DSA90804A.
We have to have statistics on the measurement results.
Does anyone know how it can be done?
We prefer not to use Jitter/Noise function in analyze menu, because we do not really know how it is done and also there is a lack of statistics information.
Thanks
Alex
We need to measure duty cycle distortion (DCD) of one clock related to other clock with DSA90804A.
We have to have statistics on the measurement results.
Does anyone know how it can be done?
We prefer not to use Jitter/Noise function in analyze menu, because we do not really know how it is done and also there is a lack of statistics information.
Thanks
Alex
- Making a jitter measurement on one signal, while using a second signal as the clock - This is easy, just choose "Explicit Clock" for clock recovery, and choose what scope channel to use as the clock.
- Getting statistics for DCD - This is a little tougher, since DCD is just really a number, that is the absolute value of the mean location of the rising edge subtracted from the mean location of the falling edge. It is possible to get the raw jitter data for rising edge jitter, separate from the raw data for falling edge jitter. Once you have those numbers you could combine them. Is that what you want?
To get the separate numbers, use EZJit+ to run a jitter measurement, then save "Jitter Data" into a csv file. Look for "DDJ Rising" and "DDJ Falling" in column A. You'll see the raw values that produce the histogram and the DCD value.
As for "how it is done", you should read some of the AppNotes about Jitter analysis on the Keysight Website, including:
http://www.keysight.com/main/redirector.jspx?action=ref&cname=EDITORIAL&ckey=2599732&lc=eng&cc=US&nfr=-11143.0.00
http://www.keysight.com/main/redirector.jspx?action=ref&cname=EDITORIAL&ckey=754481&lc=eng&cc=US&nfr=-11143.0.00
I think that these cover the subject pretty well.
Al