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PCB control impedance
How to test impedance values 


When producing PCBs with controlled impedance, we need to ensure that the impedance value is the same as the customer's requirements. Therefore, we will test the impedance value before shipment.
 


 Impedance testing principle

 

Impedance testing is the process of using an oscilloscope to emit a pulse wave, receiving a reflected wave, and then comparing and analyzing two pulse waves to determine the impedance value based on the transmitted energy.
 


 Impedance test block should be added

 

We will add impedance test pieces on each PCB board, and the impedance lines/traces will be the same as the PCB. It is produced under the same process conditions as printed circuit board production. Therefore, if the impedance value on the test piece meets the requirements, we can ensure that the impedance on the printed circuit board meets the requirements.
 


 TDR Time Domain Reflector

 

Time domain reflectometer is a special oscilloscope that can generate pulse waves internally and has the function of receiving and analyzing these pulses. We will use a TDR time-domain reflectometer to measure these impedance values.








        
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  • Classification of impedance controlClassification of impedance control
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  • Impedance matching of PCB manufacturersImpedance matching of PCB manufacturers
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