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15 Threads found on Tdr Measurement
A frequency domain measurement, e.g. S11 of the 50 ohm terminated cable can be converted to time domain to get a simulated tdr measurement. Some newer VNA intsruments provide the feature as a software option. It's relative simple in case of a constant impedance variation. You get a circle around the origin in Smith chart and can calculate (...)
This design assumes a certain conductor resistance per km length to use Ohm's Law to measure distance. It ignores EMI induced into long transmission lines, ignores inductance and requires that no transformers be connected when the fault is detected which would cause measurement error. Most line fault detectors use a pulse with tdr method to loc
If I am trying to get an accurate measurement of the isolation of a ferrite circulator, and I use time domain to analyze the reverse isolation, what am I getting? i.e. I can time gate out "tdr pulses" from the isolated port, and get rid of reflectons from the imperfect terminating 50 ohm load. then convert back to frequency domain to see the is
Hi, I am simulating a multilayer semiconductor wave guide structure with metal on top in HFSS which is a straight wave guide as shown in picture 1. I have to do impedance measurement using tdr but I dont understand how does it work. I am doing the interpolating sweep and normalizing the ports too which are the requirements to do tdr (...)
In a recent discussion about tdr (time delay reflectometer9 design, an inexpensive ns resolution time measurement method utilizing the PIC24 CMTU (a time-to-analog intervall measurement) has been suggested. Similar methods may work for your application as well. About 1 ns resolution measurement with
I don't understand how you want to do a tdr measurement using the VNA, but I am not interested to find. By definition tdr measurements use an oscilloscope and a pulse generator. Check the application note below from Tektronix, which is one of the inventors of this method.
i think u will need a tdr , to locate the impedance changes in ur cables. some VNA are equiped with this option khouly
tdr measurement is the standard method, I think.
industry design and validation may use two method to measure pad capacitance, one of them is simple LRC meter, which adopted a electrical bridge connection and tune all the legs to be balanced and calculate the cap (all of the tunning operation is automatic). the other way is using tdr unit, which is an expensive equipement, by sending out a very n
Can anybody share some materials of tdr measurement or theory ?
Hello! Unfortunately HP cancelled the distribution of the software extensions for some network analyzers like 8752A, 8752B, 8752C, 8753A, 8753B, 8753C, 8753D. Formerly there has been disks with a numerical password (which was calculated from the S/N of the unit) to enable software extensions like tdr measurement. Has someone a collection o
Hello! Anybody out here who is using Anritsu Wiltron 54xxA series scalar network analyzer? Could be 5407A, 5409A, 5411A, 5417A or something similar. There had once been a PC program that has done tdr measurement via the IEEE 488 / GPIB bus. The program was locked with a dongle. I was able to find a dongle, but not the program itself. Is here
Hello, I am interested in calculating the Capacitance (& perhaps Inductance) values from a tdr measurement along a 2 inch stripline when rise time of driver is about 70ps. I would also like to confirm and verify these values (approximately) with an HFSS stripline model simulated from DC-8GHz. If anyone run into this kind of comparison in the pas
there is several techniques for impedance measurement. one that is useful in RF is using a tdr. A tdr can be built using only a fast pulse generator and an oscope. the pulse is send trough the cable and is reflected if there is a mistmatching. the amount of mismatching is an indication of the impedance against the reference, in
does anybody have info for building a tdr instrument for cable length measurement? thanx in advance