According to the demand of dispatch automation for electric power in oilfields,thetransient shift error of current and voltage transformer in measuring process was analyzed inthis paper;in which expressions of effective value,average value and maximum value weregiven;the expression of transient phase angle’s error was shown as well; then the stablevalue was compared with them.

Dynamic allan variance analysis for the drift error of fiber optical gyroscope;

An effective and practicable solution of separating coefficient of static drift error of the platform was presented.

In order to improve the precision of gyroscope,case rotation is usually applied to automatically compensate drift error torque relative to the case.

Five moving error components in a motional direction can be measured by using this system simultaneously, such as yawing, Pitching rolling, and two straightness errors.

The error of phase-shifting always exists in experiments and it will cause the error in phase reconstruction.

After studying the error of reconstructed phase caused by the error of phase-shifting,we have got the relation between the error of reconstructed phase and phase-shifting,and present a compensation algorithm that bases on digital holography four-step phase shifting and interference fringe fit with cosine function.