SN EN 60444-6 : 1997

Committees responsible
National foreword
Introduction
1 General
    1.1 Scope
    1.2 Normative references
2 DLD effects
    2.1 Reversible changes in frequency and resistance
    2.2 Irreversible changes in frequency and
          resistance
    2.3 Causes of DLD effects
3 Drive levels for DLD measurement
4 Test methods
    4.1 Test method A (pi-network method)
    4.2 Test method B (oscillator method)
Annex
A (normative) Relationship between electrical drive level
    and mechanical displacement of quartz crystal units
Figures
1 Maximum tolerable resistance ratio y for the drive
    level dependence as a function of the resistances Rr2 or
    Rr3
2 Insertion of a quartz crystal unit in an oscillator
3 Crystal unit loss resistance as a function of
    dissipated power
4 Behaviour of the Rr of a quartz crystal unit
5 Block diagram of method B
6 Installed -Rosc in scanned drive level range
7 Drive level behaviour of a quartz crystal unit as a
    function of drive level focused against an installed
    -Rosc as a test limit in the method B test
8 Principal schematic diagram of the go/no-go test
    circuit of method B
Annex ZA (normative) Normative references to international
publications with their corresponding European publications