[time-nuts] another Ebay mixup, 5370
SAIDJACK at aol.com
SAIDJACK at aol.com
Sun Jun 10 19:30:12 UTC 2007
In a message dated 6/10/2007 07:54:34 Pacific Daylight Time, didier at cox.net
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.
More information about the Time-nuts_lists.febo.com
mailing list