Hello Pete, Bruce, I can confirm that the Wavecrest is sensitive to edge rise-time. It was not designed to measure sine waves. With a 10MHz sine wave from a Fury GPSDO as the source I get 8 - 10ps rms jitter. That exact same signal run through an NC7SZ04 buffer prior to feeding it into the DTS-2075, then scaled to the +/-1.1Vpeak input of the DTS-2075 yields jitter below the units' noise floor (~3.2ps rms) on a good OCXO. I also have a DTS-2070C that performs slightly better - about 2.9ps rms. bye, Said In a message dated 4/4/2009 17:43:23 Pacific Daylight Time, [email protected] writes:
Bruce, Your analysis conforms closely to measured results on my DTS-2075. With the cleanest 10MHz source I have, at 2Vp-p, the DTS-2075 jitter reading is 11.4ps rms. Running this number back into equivalent input noise yields 716uV rms. The DTS-2075 input spec (assumed to be for -3dB response) is 700MHz, which should be nearly 900MHz equivalent noise bandwidth. These numbers are all reasonable & serve to demonstrate the need for low noise signal conditioning. Pete Rawson _______________________________________________ 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.
