This is highly dependent on the TDR especially ones designed for long twisted pair runs where a high voltage pulse is used to overcome resistive losses
Content by Scott Typos by Siri > On Jun 30, 2016, at 10:59 AM, David <davidwh...@gmail.com> wrote: > > The Tektronix 1502 uses a tunnel diode pulser to produce a 50 > picosecond output step of about 200 millivolts. There is a misprint > in the theory section of the service manual which says "400 V" instead > of "400mV". > >> On Thu, 30 Jun 2016 04:19:43 -0400, you wrote: >> >> If the nominal velocity of propagation is known and length is known delay is >> easily determined mathematically >> >> Time Domain Reflectrometry is the usual technique for finding cable length >> but even there the cables NVP is an essential parameter if you want to >> compute length but not essential in time nuts application because we are >> interested in delay which a TDR reads directly When using a TDR its best if >> cable is unterminated as the discontinuity at the end is helpful as a >> marker. Also most TDRs like the Tek 1502 can put 100v or more on the cable >> which will blow most GPS antennas > _______________________________________________ > 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.
