The results indicate that three dimensional velocity distribution of pump passage could be measured accurately with probe to calculate the discharge of each pump. The discharge measuring accuracy is ±(1.6~2.0) %,which is equivalent with saline concentration method,and higher than that of current meter method.
This paper approaches the methods and principles for measuring the AC main exciter’s 100Hz(or higher frequency) current and voltage in terms of current transformer,AC current meter,potential transformer and AC voltage meter.
the HDL description of 80C51 core is transformed into ADD (Assignment Decision Diagram) and generated instruction sequence from ADD for testing AT89C51. To make the test process feasible, instruction sequences generated from ADD are executed repeatedly by the microprocessor and the average current consumed by AT89C51 is then measured with a simple current meter.
In order to solve the problem, we analyzed the origin of unusual errors of surveying the internal resistance of a sensitive electric current meter with the practice of experiment teaching, and explore how to enhance the survey precision.
Effect of the flow conditions on the metrological characteristics of a contact acoustic current meter
To prove that the new current meter can be produced, the relationship between the recorded electric signal and the velocity field, with two transducers being towed across the areas of variable currents, is examined.
These shifts account for about 90% of the estimated value of current velocity energy pulsations in the frequency band corresponding to the proper frequency oscillations of the current meter and of the vessel's roll and-and-pitch motions.
In situ observations of the movement of a current meter attached to a long cable system of a drifting research vessel are discussed.
Proper movement of a current meter mounted on a suspended drift station