Recommendation 2 of the 78th CIPM (1989)

Improvement of the frequency accuracy of primary standards

The Comité International des Poids et Mesures,

considering

• the need to improve accuracy III the scale unitary interval of International Atomic Time (TAI),
• the small number of primary caesium standards contributing effectively to TAI,

recommends

• the construction of new primary caesium standards,
• the improvement of the frequency accuracy of existing primary standards,
• the study of the systematic differences in frequency between them.

DOI : 10.59161/CIPM1989REC2E