This part of IEC 60122 has been compiled in response to a generally expressed desire on the
part of both users and manufacturers for guidelines to the use of quartz crystal units for filters
and oscillators so that the crystal units may be used to their best advantage.
It draws attention to some of the more fundamental questions which will be considered by the
user before it places its order for a unit for a new application, and in so doing will, it is hoped,
help ensure against unsatisfactory performance, unfavourable cost and non-availability. It is
not the function of this document to explain theory, nor to attempt to cover all the eventualities
that can arise in practical circumstances. Lastly, it it is not considered as a substitute for close
liaison between manufacturer and user.
Standard specifications, such as those of the IEC of which these guidelines form a part, and
national specifications or detail specifications issued by manufacturers, will define the available
combinations of the resonant characteristics and the temperature characteristic. These
specifications are compiled to include a wide range of quartz crystal units with standardized
performances. It cannot be over-emphasized that it is the responsibility of the user , wherever
possible, to select the quartz crystal units from these specifications, when available, even if it
can lead to making small modifications to the circuit to enable the use of standard resonators.
This applies particularly to the selection of the nominal frequency.

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