CN2060555U

CN2060555U - Portable automatic checker for electric meter

Info

Publication number: CN2060555U
Application number: CN 88218131
Authority: CN
Inventors: 夏吉安
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-07-06
Filing date: 1988-07-06
Publication date: 1990-08-15

Abstract

The utility model relates to a portable automatic checker for electric meter which comprises adjustable constant load, an infrared counting probe and a counting preset circuit. The tested electric meter is enabled to work under the condition of constant voltage and constant load, and the number of revolution of a rotating disk is electronically timed and counted. Thus, the utility model is a practical and convenient electrical metering tool, having the advantages of accurate and reliable checking, high measuring accuracy, the capability of being used on line, small size, light weight, convenient carrying, easy fabrication and low cost and broad application to establishment units and households.

Description

Portable automatic checker for electric meter

A kind of portable watt-hour meter automatic calibrating instrument belongs to the test or the calibration of the instrument of the time integral of measuring power or electric current in the physics.

Existing watt-hour meter tester, be a kind of desk-top or cabinet type main equipment, adopt the method for standard table verification, promptly has a reference kilowatthourmeter, tested watt-hour meter and standard scale are tested comparison under the same conditions, difference is the error of tested table, proofread and correct then and keep in repair, be suitable for electric-power metering above county level management unit, though this tester precision height, but must tear each ammeter just in use come open, thereafter install again, influenced user's normal power supply, verification expense height, time is long, and grass-roots unit and huge numbers of families' watt-hour meter all can not obtain verification and application; The electrician of some unit adopts a kind of simple approach verification, select one fixedly trade mark power bulb do load, with the wrist-watch timing, naked eyes and wrist-watch timing uncertainty, voltage instability in addition, checking precision is very low, can not be as regular watt-hour meter metering outfit.

The portable watt-hour meter automatic calibrating instrument that the utility model aims to provide that a kind of volume is little, in light weight, measuring accuracy is high, verification is accurate, can online use.

This portable watt-hour meter automatic calibrating instrument, as shown in Figure 1, by auto-transformer ［ 1 ］, AC electronic voltage stabilizer ［ 2 ］, adjustable constant load ［ 3 ］, infrared counting probe ［ 4 ］, counting gives circuits ［ 5 ］, timer ［ 6 ］, pocket calculator ［ 7 ］, dc supply ［ 8 ］ is formed, auto-transformer ［ 1 ］ has a plurality of taps, go out the various different voltages value from idol, wherein mainly can be for the input of AC electronic voltage stabilizer and dc supply, civil power is by auto-transformer ［ 1 ］, enter AC electronic voltage stabilizer ［ 2 ］, automatically select suitable joint gear, export the power input of the stable tested watt-hour meter of 220V alternating current crimping ［ 9 ］, tested watt-hour meter ［ 9 ］ load is replaced by adjustable constant load ［ 3 ］, adjustable constant load ［ 3 ］ combines for a plurality of wire-wound resistors and selector switch, under the constant load conditions, tested watt-hour meter begins to run well, its rotating disk number is by infrared counting probe ［ 4 ］, export counting to and give circuits ［ 5 ］, infrared counting probe ［ 4 ］ (see figure 2) is that a kind of photoelectric sensor light activated to redness and that can change electric signal into adds photoswitch circuit and constitutes, counting gives circuits ［ 5 ］ (see figure 3) and then puts waver by giving, give and put resistor group, counting circuit constitutes, counting gives circuits ［ 5 ］ tunnel control timers ［ 6 ］ to carry out timing and latchs, timer ［ 6 ］ is by time base circuit, counting circuit, the charactron display is formed, counting gives another road of circuits ［ 5 ］ and counts tested watt-hour meter dial revolution repeatly, counting gives also may command relay of circuits ［ 5 ］, and then control adjustable constant load and test adjustable constant load and power connection when beginning, cut off and being connected of power supply in the test back that finishes, dc supply ［ 8 ］ is supplied with timer ［ 6 ］, infrared counting probe ［ 4 ］, counting gives the direct-current working volts of circuits ［ 5 ］, and pocket calculator ［ 7 ］ carries out the error computing.

Principle of work is as follows: civil power is done the power supply input by AC electronic voltage stabilizer for tested watt-hour meter, adjustable permanent electric loading is then as the load of tested watt-hour meter, like this in constant voltage, the tested watt-hour meter of working under the constant load, its rotating disk revolution becomes electric signal by infrared counting probe and transports to counting and give circuits counting repeatly, counting gives circuits control timer and picks up counting, if the time is too much or very few in certain revolution, illustrate that tested watt-hour meter is inaccurate, taking watt-hour meter apart debugs, till being calibrated to standard value, certainly, this portable watt-hour meter is tested instrument automatically when producing by batch, according to all size of tested watt-hour meter, the tabulation of the standard time under the standard revolution can be enclosed, as checking data.

Fig. 1 is the utility model accompanying drawing;

Fig. 2 is infrared counting probe circuit figure;

Fig. 3 gives circuits figure for counting.

Make this portable watt-hour meter automatic calibrating instrument, auto-transformer adopts a plurality of taps, one group of rectification input as dc supply is wherein arranged, another group is done the input of AC electronic voltage stabilizer, AC electronic voltage stabilizer is domestic general circuit, export the input end that constant 220V alternating voltage removes to connect tested watt-hour meter, the infrared counting probe is bought for market, counting gives circuits and adopts the cmos circuit piece to form on-off circuit and optoelectronic switch amplifying circuit, it is that the NE555 time base circuit in 1 week is as calibrated generator that timer adopts frequency, counter is 14533 chips, the LED charactron shows clocking value, pocket calculator is that market is bought, adjustable constant load is that waver connects accurate wire-wound resistor, the power of these resistance, resistance can be designed to various numerical value according to the different size of tested watt-hour meter, this portable watt-hour meter automatic calibrating instrument complete machine is made square shell with iron plate or plastics, voltage table, power switch, waver, the charactron display, all can be fixed on the housing face-plate, the infrared counting probe then is connected with square body by cable, and pocket calculator ［ 7 ］ carries out the error computing.

This Portable automatic checker for electric meter, tested kilowatt-hour meter is worked under constant voltage, constant load conditions, its rotating disk revolution electronic timer number, thereby verification is accurate, reliable, measuring accuracy is high, can use online, having simultaneously the characteristics that volume is little, in light weight, easy to carry, manufacturing is simple, cost is low, be widely used in grass-roots unit and huge numbers of families, is the electrician's metering outfit that is suitable for.

Claims

1, a kind of portable watt-hour meter automatic calibrating instrument, it is characterized in that having auto-transformer [1], AC electronic voltage stabilizer [2], adjustable constant load [3], infrared counting probe [4], counting gives circuits [5], timer [6], pocket calculator [7], dc supply [8], civil power is through auto-transformer [1], AC electronic voltage stabilizer [2] connects the input of tested watt-hour meter [9], adjustable constant load [3] is as the load of tested watt-hour meter [9], tested watt-hour meter [9] rotating disk revolution is through infrared counting probe [4], counting gives circuits [5] to timer [6] timing, and meter is counted repeatly, and dc supply [8] is then supplied with timer [6], infrared counting probe [4], counting gives the direct-current working volts of circuits [5].

2, portable watt-hour meter automatic calibrating instrument according to claim 1 is characterized in that described auto-transformer (1) has a plurality of taps, goes out the various different voltages value from idol.

3, portable watt-hour meter automatic calibrating instrument according to claim 1 is characterized in that described adjustable constant load (3) combines for a plurality of wire-wound resistors and selector switch.

4, portable watt-hour meter automatic calibrating instrument according to claim 1 is characterized in that described infrared counting probe (4) is a kind of photoelectric sensor that also can change electric signal to the red light sensitivity into.

5, portable watt-hour meter automatic calibrating instrument according to claim 1 is characterized in that described counting gives circuits (5) and is made up of on-off circuit and optoelectronic switch amplifying circuit.

6, portable watt-hour meter automatic calibrating instrument according to claim 1 is characterized in that described timer (6) is made up of time base circuit, counting circuit, charactron display.

7, portable watt-hour meter automatic calibrating instrument according to claim 1 is characterized in that described counting gives circuits (5) and counts repeatly to give and put and control timer (6) timing.