CN103163370B - A kind of method of testing of intelligent electric energy meter clock frequency under high-temperature environment - Google Patents

Abstract

The invention relates to a method for testing the clock frequency of an intelligent electric energy meter in a high-temperature environment. The steps are as follows: 1) Connect the working power supply AC and switch K1 in series to the power supply terminals X2 and Y2 of the smart meter, and connect the resistor R, battery pack DC and switch K2 in series to the clock signal terminals X1, Y1 and On the counting terminals X3 and Y3 of the general counter; the crystal frequency output terminal A1 of the standard crystal oscillator generator is connected to the crystal frequency input terminal X4 of the general counter through a coaxial cable; In the experiment box, adjust the temperature to the specified test temperature; 3) Close the switches K1 and K2, start the counting switch of the general counter, turn on the standard crystal oscillator generator to emit a crystal frequency of 10MHz, pass the test of the general counter and display the clock frequency of the smart energy meter. The positive effect of the invention is that it can accurately and reliably complete the test of the clock frequency of the smart electric energy meter under high temperature, which is simple and convenient.

Description

A test method for clock frequency of smart electric energy meter in high temperature environment

technical field

The invention relates to a method for testing the clock frequency of an intelligent electric energy meter in a high-temperature environment.

Background technique

The smart energy meter is an important part of the electricity collection system. Its stable and reliable operation is related to the construction progress of the smart grid, and even affects the safe use of electricity by the majority of power customers. The clock frequency is an important technical parameter of the smart energy meter, and its accuracy Will affect the function and reliability of the meter. However, due to the limitation of the volume of the high and low temperature test chamber, it is impossible to use the test bench body to test the clock frequency of the smart energy meter in a high temperature environment during the detection process of the smart energy meter, which has brought huge economic losses to the power company.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for testing the clock frequency of an intelligent electric energy meter in a high temperature environment.

The technical solution adopted by the present invention to solve its technical problems:

The steps of the present invention are as follows:

(1) Connect the working power supply AC and switch K1 in series to the power terminals X2 and Y2 of the smart meter, and connect the resistor R, battery pack DC and switch K2 in series to the clock signal terminals X1 and Y1 of the smart meter; The crystal oscillator frequency output terminal A1 of the standard crystal oscillator generator is connected to the crystal oscillator frequency input terminal X4 of the counter through the coaxial cable, and the counting terminals X3 and Y3 of the general counter are connected to the resistor R after series connection, the battery pack DC and the switch K2. end;

(2) Keep the switches K1 and K2 off, only put the smart meter into the high and low temperature test chamber, start the high and low temperature test chamber, and adjust the temperature to the specified test temperature;

(3) Close the switches K1 and K2, apply voltage to the smart energy meter to make it in working state; start the counting switch of the general counter, turn on the standard crystal oscillator generator to emit the crystal oscillator frequency, and test the smart energy meter under high temperature conditions through the general counter the clock frequency.

The model of the universal counter is SC7201;

The standard crystal oscillator generator uses a JS1 error calculator to provide a crystal oscillator frequency of 10MHz.

The positive effects produced by the present invention are as follows: the method can accurately and reliably complete the test of the clock frequency of the smart electric energy meter under high temperature, is simple and convenient, provides a strong technical support for the quality control of the intelligent electric energy meter, and avoids bringing problems to electric power companies. economic loss.

Description of drawings

Fig. 1 is a schematic diagram of the connection relationship of equipment used in the present invention.

In Figure 1, 1 smart electric energy meter, 2 general-purpose counters, 3 standard crystal oscillator generators, 4 high and low temperature test chambers.

detailed description

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

As can be seen from Fig. 1, the working process of the present embodiment is as follows:

1) Connect the working power supply AC and the switch K1 in series to the power terminals X2 and Y2 of the smart meter 1, connect the resistor R, the battery pack DC and the switch K2 in series and connect them to the clock signal terminals X1 and Y1 of the smart meter 1; The crystal oscillator frequency output terminal A1 of the standard crystal oscillator generator 3 is connected to the crystal oscillator frequency input terminal X4 of the counter 2 through a coaxial cable, and the counting terminals X3 and Y3 of the general counter 2 are connected to the resistance R, battery pack DC and Both ends of the switch K2;

2) Keep the switches K1 and K2 off, only put the smart meter 1 into the high and low temperature test chamber 4, start the high and low temperature test chamber 4, and adjust the temperature to the specified test temperature;

3) Close the switches K1 and K2, apply voltage to the smart energy meter 1 to make it in the working state; start the counting switch of the general counter 2, turn on the standard crystal oscillator generator 3 to transmit the crystal oscillator frequency, and test the smart energy meter 1 through the general counter 2 clock frequency under high temperature conditions.

The model of the universal counter 2 is SC7201;

The standard crystal oscillator generator 3 selects the JS1 error calculator to provide a crystal oscillator frequency of 10 MHz.

The prescribed test temperature is 60°C, which is the maximum working temperature of the smart energy meter 1 .

The resistance R is 1.5KΩ, the battery pack DC2 is a 6V direct current voltage, and the working power supply AC is a 220V alternating current power supply.

The model of the universal counter 2 is SC7201;

The standard crystal oscillator generator 3 selects the JS1 error calculator to provide a crystal oscillator frequency of 10 MHz.

Working principle of the present invention:

The DC voltage of the battery pack is 6V, and the resistor R is a pull-up resistor with a resistance value of 1.5KΩ. The saturation current of the coupler is about 3mA. It is impossible to directly measure the clock frequency at the clock signal terminal with the general-purpose counter 2 and the standard crystal generator 3 without adding an external circuit.

The accuracy of the monitoring is related to the measuring instruments (namely the universal counter 2 and the standard crystal generator 3). The measuring instrument is outside the high and low temperature test chamber 4, which ensures that the measuring instrument is not disturbed by the environment.

Claims (2)

1. the method for testing of an intelligent electric energy meter clock frequency under high-temperature environment, it is characterised in that step is as follows:

1) working power AC and switch K1 series connection are followed by power supply terminal X2, Y2 of intelligent electric energy meter (1), resistance R, set of cells DC and switch K2 series connection are followed by clock signal terminal X1, Y1 of intelligent electric energy meter (1)；Crystal oscillator frequency input X4, counting end X3, Y3 of described universal counter (2) that the crystal oscillator frequency output terminals A 1 of standard crystal oscillator generator (3) connects universal counter (2) through coaxial cable connect resistance R after concatenation, set of cells DC and the two ends of switch K2；

2) described switch K1 and switch K2 remains open, and described intelligent electric energy meter (1) is only put into high/low temperature experimental box (4), starts high/low temperature experimental box (4), adjusts temperature to regulation test temperature；

3) described switch K1 and switch K2 is closed, to intelligent electric energy meter (1) making alive so that it is in running order；Start universal counter (2) counter switch, open standard crystal oscillator generator (3) and launch crystal oscillator frequency, by universal counter (2) test intelligent electric energy meter (1) clock frequency under the high temperature conditions.

The method of testing of a kind of intelligent electric energy meter clock frequency under high-temperature environment the most according to claim 1, it is characterised in that the model of described universal counter (2) is SC7201；

Described standard crystal oscillator generator (3) selects JS1 Error Calculator, it is provided that the crystal oscillator frequency of 10MHz.