0
\$\begingroup\$

When we manufacture certain PCBs, where 50ohms impedance matching is required the manufacturer provides a small PCB strip along with the actual PCB. What is the actual purpose of this?

\$\endgroup\$
  • \$\begingroup\$ Where's the photo? \$\endgroup\$ – Transistor Oct 1 '19 at 6:03
  • 1
    \$\begingroup\$ To verify that the matched impedance is in fact 50 ohms. You can use a network analyzer or Time domain reflectometer (TDR) to measure the impedance. \$\endgroup\$ – Peter Karlsen Oct 1 '19 at 6:04
  • \$\begingroup\$ @PeterKarlsen Spectrum analyzer can be used? \$\endgroup\$ – MightyBeard007 Oct 1 '19 at 6:12
  • \$\begingroup\$ @PeterKarlsen I suggest you turn that into an answer. \$\endgroup\$ – Oldfart Oct 1 '19 at 6:33
1
\$\begingroup\$

To verify that the matched impedance is in fact 50 ohms.

You can use a network analyzer or Time domain reflectometer (TDR) to measure the impedance.

I'm not quite sure about this, but it might be possible to use a spectrum analyzer with build-in tracking generator to get an idea about the impedance. The phase information will be missing thou.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.