Certain problems of the operational reliability of electrical measuring instruments

Conclusions

• 1. The operational reliability of indicating electrical-measuring instruments depends on both their technical properties and the conditions and procedure of use.

• 2. Electrodynamic measuring instruments have the highest operational reliability.

• 3. A reduction of the indicating electrical-measuring instruments' precision raises their operational reliability.

• 4. During normal use the instruments are subjected to the same extent to metrological and sudden failures (according to their apparent effects).

• 5. The application of a running-in period consisting of mechanical, climatic, and electrical disturbances applied to the technological cycle of the instruments' manufacture raises their operational reliability by 20–25%.