EN 60444-4:1997

Committees responsible
National foreword
Method
1 Scope
2 Measuring circuit
3 Method of measurement
Appendix
A Recommendations regarding the use of load capacitors
Figures
A1 Typical load capacitor with carrier
A2 Method of insertion of load capacitor into pi-network
A3 Circuit diagram of pi-network including load
    capacitor C1
A4 Load capacitance inaccuracy as a function of frequency,
    for a load capacitance of 30 pF inclusive of calibration
    inaccuracy and residual inductance effects (Worst case
    situation)
A5 Relative measurement error of fL versus crystal
    pulling sensitivity for various frequencies at a load
    capacitance of 30 pF
A6 Relative measurement error of R1 versus frequency, for
    various values of C1
A7 Relative measurement error of Cl as a function of
    frequency
A8 Relative measurement error of C1 as a function of
    C1 for various frequency measurement errors C0 =
    5 pF; CL1 = 15 pF; CL2 = 30 pF
A9 Relative measurement error of C1 as a function of
    C1 for various values of quality factor Q C0 = 3 pF;
    CL1 = 15pF; CL2 = 30 pF
Annex ZA (normative) Normative references to international
publications with their corresponding European publications

Specifies a simple method of measuring load resonance frequency. The method uses the change in resonance frequency which occurs when a load capacitance is inserted in series with the crystal unit.