I Didn't look at pulse bandwidth. 2.4ns compared to 10 ns Other than that about the same unit.
----- Original Message ----- From: "phil" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Thursday, June 19, 2008 9:48 AM Subject: Re: [time-nuts] 5370B arrived - any FAQ > Why an 8082A, that's a 250MHz unit. Would not an 8015A 50MHz work. I think > it's the same only with a lower bandwidth. > > ----- Original Message ----- > From: "wje" <[EMAIL PROTECTED]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Sent: Thursday, June 19, 2008 9:01 AM > Subject: Re: [time-nuts] 5370B arrived - any FAQ > > >> Why, you use your 8082A! I got one for a steal a couple of years ago on >> EBay. >> However, all you really need is a fast rise-time pulse generator that >> has external triggering and a variable trigger delay, and can generate >> a +1/-1 volt swing. The frequency the tests use aren't that critical, >> anything 1Mhz or higher should work. The only semi-critical parameter >> is the rise time; the faster it is, the less trigger uncertainty you'll >> have. 1ns is good. :) Also, unless the delay time setting is rather >> fine, it's extremely difficult to actually do the anti-coincidence >> alignment. >> What I'm missing is a spectrum analyzer, so I haven't done the >> frequency multiplier alignment on either of my 5370s. Any tricks for >> doing that without one? >> Bill Ezell >> ---------- >> They said 'Windows or better' >> so I used Linux. >> >> Chuck Harris wrote: >> >> wje wrote: >> >> >> >> Freq vs time interval - simplistic answer: when you're using >> time-gating, you're looking at more samples than in averaged one-period >> mode. For 10Mhz, a gate of 0.1 secs is 1 million periods. In period >> mode, you're averaging a maximum of 100,000 periods. Accuracy is >> proportional to the square root of the number of samples. >> >> >> Also, the trigger point jitter when in one-period mode affects every >> sample, but when in gate mode it only affects the first and last >> cycle. >> >> >> The 'specifications' section of the manual gives the formulas for >> determining both resolution and accuracy (which are NOT the same) for >> the various modes. >> >> I would suggest you go through the detailed alignment procedures even >> though the unit passes the operational checks. These units almost always >> have drifted out of alignment in the analog front-end unless you were >> lucky enough to get a freshly-calibrated one. You can usually >> significantly improve channel-to-channel trigger consistency and lower >> the jitter by doing so. >> >> >> What does one do where the tests call for an HP8082A pulse generator? >> The silly things are so rare that they are priced in the stratosphere! >> >> -Chuck Harris >> >> _______________________________________________ >> time-nuts mailing list -- [EMAIL PROTECTED] >> To unsubscribe, go to >> [2]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> References >> >> 1. mailto:[email protected] >> 2. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
