In a message dated 6/10/2007 07:54:34 Pacific Daylight Time, [EMAIL PROTECTED] writes:
>scope). The top waveform is a little blurry because the two time bases >are not phase locked, and I triggered on the HP5370. >http://www.ko4bb.com/Test_Equipment/HP_5370A/HP8657B-HP5370A.png >I also have a spectrum plot of the HP5370A ref output. >http://www.ko4bb.com/Test_Equipment/HP_5370A/HP5370A.jpg >Didier Hi Didier, thanks for the pics! Yes, the signals almost look the same. Your 10MHz output is even a bit more noisy. On the Wavecrest set to Oscilloscope mode (it can work like a normal high-speed scope) I see the small humps around the zero crossing appear and disappear quickly, so I think these are causing the modulation, and hence the >200ps jitter. Not a clean sine-wave for sure. I am glad it's not just my unit. To everyone: would my unit perform better with very(!) careful calibration? Is there any cal-lab that can do it inexpensively, and not mess up the unit (I have had instruments returned to me after cal that were mistuned, and worked less well than before)? There are so many trimmer caps inside that for sure I am not going to move a single one of 'em :) Then again I get <50ps jitter with 8.2 readings per second using the external Ref input, so maybe I should be content with that. That's a lot better than my 53132A. Thanks again everyone for your useful hints! bye, Said ************************************** See what's free at http://www.aol.com. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
