From: <[EMAIL PROTECTED]> Subject: Re: [time-nuts] SRS SR620 External Source Issue -- Help Request Date: Wed, 21 Feb 2007 18:13:08 -0500 Message-ID: <[EMAIL PROTECTED]>
> I've done the self calibration. Nothing changes. I've let everything > warm-up and checked both channels A and B, same thing. I've swapped the > cables on the front and the back, same thing. I've tried a T-connector on > the ref input with 50ohm termination, same thing. > > The readings are pretty stable, they are just offset by -0.0015 Hz. Hmm. Interestingly enought I've seen something similar on a HP5372A where the A channel was slightly low on the frequency but not the B channel. I have not investigated that in detail to make any conclusions but that 5372A may be in for a slight trim-up. Since it's interpolators allow for "interesting" trimming of each interpolator step it would be interesting to see if I could trim it in and out of frequency! Now, if the interpolator trimming is the culprit, I need to wrap my head around on how it turns out as a frequency error. I'll check it again tomorrow, as I use it daily right now. I don't have the manuals (and particular the service manual) for the SR620, does anybody have them in electronics form? Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
