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IEC 60444-11:2026 ED2

Measurement of quartz crystal unit parameters - Part 11: Standard method for the determination of the load resonance frequency f<sub>L</sub> and the effective load capacitance C<sub>Leff</sub> using automatic network analyzer techniques and error correction

Publication date:   Apr 22, 2026

General information

60.60   Standard published   Apr 22, 2026

IEC

TC 49

International Standard

31.140   Piezoelectric devices

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Scope

IEC 60444-11:2026 defines the standard method of measuring load resonance frequency fL at the nominal value of CL, and the determination of the effective load capacitance CLeff at the nominal frequency for crystals with the figure of merit M > 4.
This edition includes the following significant technical changes with respect to the previous edition:
a) key content of withdrawn IEC TR 60444-4 is reproduced as Annex A;
b) some formulae in the first edition have been corrected.

Life cycle

PREVIOUSLY

WITHDRAWN
IEC 60444-11:2010 ED1

NOW

PUBLISHED
IEC 60444-11:2026 ED2
60.60 Standard published
Apr 22, 2026