Gw Instek LCR-821 Digital-Multimeter, DMM, LCR-821 Hoja De Datos

Impedance (Z) and Admittance (Y = 1/Z) Formula 

 

Background 

Impedance measures the total amount of 
opposition between two terminals in an AC circuit. 
Admittance is the reciprocal of Impedance and 
measures how easily the electricity flows in an AC 
circuit. 

Note 

Admittance is only shown for its relation to 
impedance. Admittance is not measurable with the 
LCR-800 series. 

Type 

Impedance (Z) 

Admittance (Y) 

Formula 

1





 





 













 





2

2





 





2

2





 



cos



 



sin



 

1





 





 













 





2

2





 





2

2





 



cos



 



sin



 

Quality factor (Q) and Dissipation factor (D) Formula 

 

Background 

Both Quality factor and its reciprocal, Dissipation 
factor, are used for measuring the rate of energy 
dissipation relative to the measurement frequency. 

 

Low energy dissipation: high Q, low D 

 

High energy dissipation: low Q, high D 

Type 

Quality factor (Q) 

Dissipation factor (D) 

Formula 





1





 









 





1

90

tan

1











 









 









 





1

90

tan









