Problem about characteristic impedance

[Archer]

how to measure the characteristic impedance of a coax?
I'm starting to study the rf circuit design.

 

[Rich Grise]

how to measure the characteristic impedance of a coax?
I'm starting to study the rf circuit design.

I've always found a time domain reflectometer gets me close enough.

Good Luck!
Rich

 

[Roy McCammon]

you the impedence (complex) with the far end
shorted and with it open and the characteristic
impedence is the (complex) geometric mean of those
two measurements.

 

[Archer]

you the impedence (complex) with the far end
shorted and with it open and the characteristic
impedence is the (complex) geometric mean of those
two measurements.

may i measure the impedence using meter?
and how would it be done that measure the open far end coax?

 

[Roy McCammon]

may i measure the impedence using meter?

I suppose you might do with a vector volt meter. Not sure.
Been too long since I used one. I'd use a scope.

and how would it be done that measure the open far end coax?

you don't measure at the far end. you just short the far end
or open the far end.

 

[Alexei Zyuzin]

Or you also could measure the inductance of the inner conductor and
capacitance between the inner conductor and the shield. Z0=sqrt(L/C)

Regards