SeeedStudio SARK-110, User Manual, Page: 75 / 103

SARK-110 User’s Manual
Rev 1.2.19 January 12
th
, 2020 - 75 - © Melchor Varela
– EA4FRB 2011-2020
Fra Self-resonant frequency of the capacitor
Z(Fop) Z at operating frequency
Z(Fra) Z at resonance frequency
Ca Equivalent capacitance at F = 1 MHz
Ra Equivalent resistance at the self-resonant frequency
The capacitor
’s parasitic inductance is calculated with the following equation:
2
) 2 (
1
Fra Ca
La
  
=

The quality factor is calculated using the following equation:
) 2 (
1
Ra Ca Fop
Qa
   
=

4.2.3 Quartz Crystal
This function determines the equivalent circuit model of quartz crystals. Detailed usage of this
function is described in the Application Note available at: http://www.sark110.com/application-
notes/equivalent-circuit-determination-of-quartz-crystals
The measurement procedure is as follows:
Select the file name and press
[●] or
select
[▲] when the results are not to be
saved in a file
Enter the frequency value, which should
be close to the expected resonant
frequency of the crystal