[time-nuts] another Ebay mixup, 5370
Henk ten Pierick
henk at deriesp.demon.nl
Thu Jun 14 14:32:10 EDT 2007
Hi Said,
We have a lot of fet probes in our lab, including Tek, hp and
Philips. Only one is useful for jitter measurements with the
Wavcrest, the hp 200MHz differential probe. I use it most of the time
single ended. It is the noise bandwidth of the probe that is of most
importance.
If realy a fet probe is needed, than use a lowpass filter with enough
bandwidth after the probe. Most of the time the majority of the
jitter is still seen and the large noise bandwidth of the probe is
attenuated.
Henk
On Jun 14, 2007, at 19:34, SAIDJACK at aol.com wrote:
>
> I have the 2G, 4G, and the 8Gs/s plug-ins, and use the 54701A
> probes, but I
> only get down to about 60ps jitter even after calibrating the
> mainframe and
> plug-ins.
>
> I typically measure single-ended outputs, but could also measure
> the FireFox
> Signal Generator differential LVDS outputs. Is measuring
> differentially the
> trick? Or not using the FET probes?
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