BS 7681-5:1995 Measurement of quartz crystal unit parameters - Part 6. Measurement of drive level dependence (DLD)
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This part of IEC 444 applies to the measurements of drive level dependence (DLD) of
quartz crystal units. Two test methods are described. Method A, based on the T-network
method according to IEC 444-1, can be used in the complete frequency range covered by
this part of IEC 444. Method B, an oscillator method, is suitable for measurements of
fundamental mode crystal units in larger quantities with fixed conditions.