Committees responsible
National foreword
Method
1 Scope
2 Co compensation circuit
2.1 Electrical specifications
2.2 Mechanical specifications
3 Crystal unit parameters with and without Co
     compensation
3.1 Series resonance frequency fs and resonance
     frequency fr
3.2 Motional resistance R1 and resonance resistance Rr
3.3 Motional capacitance C1 and motional inductance L1
4 Test circuit
4.1 The pi-network
4.2 Accessories of the pi-network
4.3 Associated equipment
4.4 Compensation circuit
5 Method of measurement
5.1 Initial calibration of the pi-network
5.2 Tuning of the compensation circuit
5.3 Frequency and resistance measurement
5.4 Evaluation of the motional capacitance C1 and
     motional inductance L1
Appendices
A Analysis of the difference of f, R, C1, and L1 as
     a result of measurement methods with and without
     compensation of Co
B Additional information on accuracy
C Additional information on circuit components given
     in Figures 4a) and 4b)
Table
A1 Typical values for parameters of oscillator crystal
     units, and the calculated theoretical differences
     between parameters increased with and without
     compensation
Figures
1 Equivalent circuit of a crystal unit with
     compensation of Co
2 Impedance diagram of a crystal unit without
     compensation of parallel capacitance Co
3 Impedance diagram of a crystal unit when Co is
     compensated with a properly tuned compensation
     network according to Figure 1
4a Simplified diagram of the pi-network with
     electrical adjustment of Co compensation
4b Simplified diagram of the pi-network with
     mechanical adjustment of Co compensation
5 Test circuit