Portable electromagnetic compatibility (EMC) test-level pulse timer for electric energy meter

Abstract

The invention discloses a portable electromagnetic compatibility (EMC) test-level pulse timer for an electric energy meter. A photoelectric probe sampling port and a pulse input sampling port are formed in a metal shell; a photoelectric probe and a light guide column of the photoelectric probe are arranged behind the photoelectric probe sampling port; the pulse input sampling port is connected with a pulse output section of an electric energy meter to be measured through a shielding wire; the photoelectric probe, and the output end and the pulse input sampling port of the light guiding column of the photoelectric probe are divided into two paths, one path is connected in parallel with a counter, and the other path is connected with the outside of the metal shell through the shielding wire from a pulse signal output end and is connected with an electric energy meter inspection device; the counter is connected with the timer and a time output module sequentially; the timer is connected with a comparator and an error output module sequentially at the same time; and the comparator is connected with a measurement module simultaneously. The pulse timer can be conveniently and intuitively operated while measuring accuracy is ensured, so that measuring efficiency is greatly improved; and the pulse timer has high electromagnetic interference resistance.

Description

[0001] technical field [0002] The invention relates to the technical field of electric energy measurement, in particular to a portable EMC test-level electric energy meter pulse timer. Background technique [0003] Fast transient burst immunity, surge immunity, conducted disturbance immunity induced by radio frequency field and attenuation oscillation specified in JJF 1245.1-2010 "General Requirements for Type Evaluation Program of Installed Electric Energy Meter" The wave immunity test requires that the accuracy of the electric energy meter be checked by the electric energy meter inspection device while the interference is applied. At present, the test devices that meet this test are generally bulky and expensive. Therefore, many small and medium-scale testing institutions and electric energy meter manufacturers adopt alternative methods, that is, by using single-phase or three-phase loads, provide voltage and current signals to the electric energy meter to generate pulse...

AI Technical Summary

Problems solved by technology

However, this type of product does not consider the electromagnetic interference that the energy meter may cause to the connected wires and the surrounding environment when it is subjected to the EMC immunity test. Therefore, when the energy meter is subjected to the EMC immunity test, such devices often interfered with and not functioning properly

In addition, the photoelectric sampling probe used in conjunction with the electric energy meter inspection device currently on the market has the following problems: 1. It cannot work independently, and is only an auxiliary device for the electric energy meter inspection device; 2. There is also the electromagnetic compatibility immunity of the electric energy meter. The possibility of interference during the test

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