On 12/29/2011 10:37 AM, Said Jackson wrote:
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<michael.c...@sfr.fr> 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 -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there._______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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