Researches the relation ship between several kinds of main proper efficient points,the relation are: strict efficient points are Henig proper efficient points;strong efficient points are Borwein proper efficient points;Strong efficient points are Henig proper efficient points;Strong ef-ficient points are Hartley proper efficient points.

We prove that strictly efficient points are indeed equivalent to Henig proper efficient points.

The Design of a Digital TRMS Electrical Parameter Test Instrumentation Based on CS5460A;

Realization of measuring TRMS of any signal waveform;

The WB TRMS Electricity Isolated Sensor and Its Application;

The adjusting apparatus uses singlechip AT89C52 as its core and uses the high precision A/D convertor ICL7135, precise operational amplifier ICL7650 and true rms value convertor AD637 to improve the testing precision.

Results show that the new method is capable of realizing a high accuracy AC/DC conversion for measurement of true RMS value.