CN102435824A - Capacitive low-voltage acoustic-optic electricity measurer - Google Patents

Abstract

The invention discloses a capacitive low-voltage acoustic-optic electricity measurer which comprises a hat body, an insulating casing and an electricity measurement contact, wherein an integrated circuit board and a battery compartment for accommodating a power supply battery are sequentially arranged inside the insulating casing; the electricity measurement contact is clamped with the insulating casing; a measuring electrode of the electricity measurement contact is in circuit connection with the integrated circuit board through a contact electrode; an acoustic-optic alarm circuit is integrated on the integrated circuit board; and a sounding hole corresponding to a sounding device of the acoustic-optic alarm circuit and an optical alarming display window of a light-emitting device are arranged on the electricity measurement contact. According to the capacitive low-voltage acoustic-optic electricity measurer disclosed by the invention, the integrated circuit board connected with the electricity measurement contact is used for measuring electricity; and corresponding circuits and the acoustic-optic alarm circuit on the integrated circuit board are used for automatically carrying out acoustic-optic alarm prompt during detection, so that the safe reliability of workers during electricity measurement is greatly increased.

Description

Capacitive low-voltage sound and light measuring appliance

technical field

The invention belongs to the technical field of measuring appliances, in particular to a capacitance-type low-voltage acousto-optic measuring appliance.

Background technique

At present, the resistance-type measuring appliances commonly used in the market have the problems of single display, high damage rate of neon lamps, and poor sensitivity. Since the resistance type measuring appliance is a series circuit of measuring electrical resistance, human body resistance, and ground resistance, whichever is the partial voltage circuit current action; if the user wears insulating shoes, gloves or stands on a high stool, wooden ladder, or pole When testing, a relatively large resistance is added, the measuring appliance does not display, there is no self-checking device, and the safety of the staff cannot be ensured; in addition, there are problems such as inconvenience and unsafety in measuring electricity in dark places.

Therefore, it is necessary to develop a safer measuring device.

Contents of the invention

The object of the present invention is to provide a capacitive low-voltage acousto-optic measuring appliance, which has a simple structure and is safe and reliable.

The present invention is achieved in this way, a capacitive low-voltage acousto-optic measuring appliance, including a cap body, an insulating shell and an electric measuring contact, and an integrated circuit board and a battery compartment for placing a power supply battery are sequentially arranged inside the insulating shell; The measuring electric contact is snapped together with the insulating shell, and its measuring electrode is connected to the circuit of the integrated circuit board through the contact electrode; the integrated circuit board is integrated with a sound and light alarm circuit, and the electric measuring contact The sound hole corresponding to the sound emitting device of the sound and light alarm circuit and the light alarm display window of the light emitting device are provided on the top.

A self-test button switch is arranged on the integrated circuit board, and the self-test button switch is exposed from the insulating shell.

The integrated circuit board is installed in the insulating casing through a card insert arranged in the insulating casing.

The capacitive low-voltage acousto-optic measuring appliance also includes a lighting circuit, and the lighting circuit includes a lighting button switch and a lighting lamp.

Wherein, the lighting circuit is powered by the power supply battery.

Further, a pen card is provided on the outside of the insulating casing to facilitate carrying the electroscope into a pocket.

The present invention measures electricity by using an integrated circuit board connected with the electric measuring contact, through the corresponding circuit on the integrated circuit board and the sound and light alarm circuit, the sound and light alarm prompt is automatically carried out during detection, which greatly improves the time when workers measure electricity. security.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the capacitive low-voltage acousto-optic measuring device provided by the embodiment of the present invention;

Fig. 2 is the front view of the measuring electrode provided by the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a card insert provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an electrical measuring contact provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a cap body provided by an embodiment of the present invention;

The sectional view of the cap shown in Fig. 6 and Fig. 5 along the A-A line;

Fig. 7 is a circuit connection diagram of the capacitive low-voltage acousto-optic measuring device integrated circuit board provided by the embodiment of the present invention. 

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in detail as follows.

As shown in Figures 1-6, a capacitive low-voltage acousto-optic measuring appliance includes a cap body 8, an insulating casing 3 and an electrical measuring contact 2, and an integrated circuit board 12 is sequentially arranged inside the insulating casing 3, and a power supply is placed. The battery compartment of the battery 7; the electrical measuring contact 2 and the insulating casing 3 are clipped together, and the measuring electrode 10 is connected to the integrated circuit board 12 through the contact electrode 11 provided on the integrated circuit board 12 connection; the integrated circuit board 12 is integrated with an acousto-optic alarm circuit; the electrical measuring contact 2 is provided with a sound hole 16 corresponding to the sound-emitting device of the acousto-optic alarm circuit and a light alarm display window of the light-emitting device.

Wherein, the measuring electrode 10 of the electrical measuring contact 2 adopts a screwdriver head type design, the sound emitting device is a ceramic piezoelectric sheet, the light emitting device is an LED lamp, and the power supply battery is a dry battery.

The electrical measuring contact 2 and the insulating shell 3 adopt a plug-in connection structure, which is convenient for installation, maintenance, and replacement of corresponding parts; the front end of the measuring electrode 10 is exposed and embedded in the electrical measuring contact 2, and the integrated circuit The board 12 is arranged on the front end part of the insulating casing 3, and is stuck in the insulating casing 3 through a card insert 13, and the measuring electrode 10 is connected with the integrated circuit board 12 through a contact electrode 11; The bottom of the cap body 8 is provided with a battery positive device 9, and one end of the battery negative spring 6 is connected to the integrated circuit board 12 through the hole 130 provided on the card insert 13; the battery positive extension piece 14 integrates the battery positive device 9 with the The circuit board 12 is electrically connected; a pen card 15 is provided outside the insulating casing 3 to facilitate the insertion of the electroscope into a pocket for carrying.

A self-test button switch 4 is provided on the integrated circuit board, and the self-test button switch 4 is exposed from the insulating shell 3 . After pressing the self-inspection button switch 4, under normal circumstances, the electroscope sends out the alarm sound of "beep, beep" and flashes red light. If there is no alarm sound, or flashes red light, or the alarm sound, If there is only one kind of red light flashing, or the alarm sound or the red light flashes slightly, you need to replace the battery and perform self-test again until it works normally.

Further, the capacitive low-voltage acousto-optic measuring device also includes a lighting circuit, the lighting circuit includes a lighting button switch 5 and an LED spotlight, and the LED spotlight is arranged at the lighting window 1 . Wherein, the LED spotlight is powered by the battery.

Referring to shown in Fig. 7, this figure shows the circuit schematic diagram of the electroscope provided by the embodiment of the present invention; the measuring electrode of the electric measuring contact is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the resistor R5; the resistors R3 and R4 are connected in series Then connect the positive and negative poles of the power supply battery, the detection button switch S1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the measuring electrode of the resistance measuring electric contact. The other end of the resistor R5 is connected to the base of the first triode V1, the collector of the first triode V1 is connected to the battery, the emitter of the triode V1 is connected to the resistor R6, and the other end of the resistor R6 is connected to the resistor R7 and the positive pole of the capacitor C1, the other end of the resistor R7 is connected to the negative pole of the capacitor C1, the positive pole of the capacitor C1 is connected to the input end of the integrated IC block, the output end of the integrated IC block is connected to the base of the second triode V2, and the first end of the integrated IC block is connected to the base of the second triode V2. The collector of the second triode V2 is connected to the battery, and its emitter is connected to the LED2 lamp for alarming through the resistor R12; the ceramic piezoelectric sheet Y is connected to the emitter of the second triode V2.

Wherein, the second triode V2, the resistor R12, the LED2 lamp and the ceramic piezoelectric sheet Y together constitute an audible and visual alarm circuit. Among them, the lighting button switch S2, the resistor R13, and the spotlight LED1 together constitute a lighting circuit.

The integrated IC block is four 2-input NAND gate circuits, using a commercially available 74HC00 chip; it includes four NAND gates A, B, C, D, resistors R8, R9, R10, R11 and capacitor C2 .

The capacitive low-voltage acousto-optic measuring appliance of the present invention has the characteristics of high reliability, the start-up voltage of the display is 50-90V, dual display of acousto-optic, free from ambient light and noise interference, and the like. Because the capacitive measuring appliance is a series circuit between the measuring appliance capacitance and the human body and earth capacitance, due to the large area of the human body and the earth, the divided voltage current of the circuit is relatively stable, and the starting value is within the specified range. When wearing gloves or standing on a high stool, it can normally display the charged state under rated voltage conditions.

In addition, it is equipped with LED spotlights, which can accurately find the measuring point in a dark environment, and avoid personal and equipment accidents caused by accidental contact with electrified objects.

Compared with the resistive low-voltage measuring appliance, the capacitive low-voltage acousto-optic measuring appliance of the present invention has a greatly increased safety factor, is convenient to carry, is convenient to use, and has high measuring accuracy, and is an ideal product for replacing the resistive low-voltage measuring appliance. Although the current price and cost are slightly higher than those of resistance-type measuring appliances, safety production is more important, and it is an irreversible trend to replace resistance-type measuring appliances.

The above disclosures are only specific embodiments of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, without departing from the principle of the present invention, the deformations made should be regarded as belonging to the present invention scope of protection.

Claims (6)

1. a capacitor type low pressure acousto-optic electricity measurer comprises cap body, insulation crust and surveys electrical contact, it is characterized in that, is disposed with the battery compartment of capacitor type integrated circuit board component, placement supplying cell in said insulation crust inside; Said survey electrical contact and said insulation crust are fastened togather, and its potential electrode is connected with said surface-mounted integrated circuit circuit unit through contact electrode; Be integrated with sound light alarming circuit on the said surface-mounted integrated circuit, on said survey electrical contact, be provided with the phonate hole of corresponding said sound light alarming circuit sound-producing device and the light alarm indication window of light-emitting device.

2. capacitor type low pressure acousto-optic electricity measurer according to claim 1 is characterized in that said surface-mounted integrated circuit is provided with the self check pushbutton switch, and said self check pushbutton switch exposes from said insulation crust.

3. capacitor type low pressure acousto-optic electricity measurer according to claim 1 and 2 is characterized in that, said surface-mounted integrated circuit is installed in the said insulation crust through the card plug-in unit that is located in the said insulation crust.

4. capacitor type low pressure acousto-optic electricity measurer according to claim 3 is characterized in that also comprise lighting circuit, said lighting circuit comprises illuminated pushbutton switch and illuminating lamp.

5. capacitor type low pressure acousto-optic electricity measurer according to claim 4 is characterized in that said lighting circuit is supplied power by said supplying cell.

6. capacitor type low pressure acousto-optic electricity measurer according to claim 1 and 2 is characterized in that, said insulation crust outside also is provided with to be convenient to this electroscope is inserted the slotting pen card that pocket carries.

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