Hello Mike, We measured a couple of these 5680As on a tsc5125a analyzer. With different quality supplies.
Very noisy buggers, huge number of spurs and very high noise floor -130dBc or so if I recall correctly. Thats probably the jitter you are seeing. Probably due to the dds generating the output not a crystal. ADEV was parts in E-011 while good, not very good. Frequency accuracy was +5E-010 then tap the box hard and it goes to -1ppb. Good enough as a portable frequency counter reference, as the offset can be compensated, and the output is fairly stable... These units could really use gps disciplining and a crystal post filter. Great stuff for $40, new they must have been over $1000. Bye, Said On Dec 29, 2011, at 1:14, mike cook <[email protected]> wrote: > Hi, > Just got my cheapo 5680A. It was accompanied by a little teddy bear > clutching a L7805CV ! > > Got a couple of questions. > > 1) What is the expected 10MHz peak to peak voltage. FEI doc seems to > indicate 0,5V but I am getting only 200mv. > 2) What is the sensitivity to 15V input level. I am only measuring 14,722 > (stable) on Pin1. > 3) Could this low input voltage affect output voltage? > > The box locks after a couple of minutes but my TDS 210 is showing a very > jittery ( 9,98-10,02 MHz ) but well formed sine wave for 8 hours of being > powered on. Could this also be an artefact of low main power? > > rega > Mike > > _______________________________________________ > 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.
