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.
