CN113125836A

CN113125836A - Current probe

Info

Publication number: CN113125836A
Application number: CN202110405572.8A
Authority: CN
Inventors: 郝春华
Original assignee: Qingdao Hantai Intelligent Technology Co ltd
Current assignee: Qingdao Hantai Intelligent Technology Co ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-07-16

Abstract

The invention discloses a current probe, which comprises a handheld device and a head measuring assembly, wherein the handheld device comprises a handle and a probe body; the inner side of the hand-held device is provided with an integrated circuit board, a primary amplifying circuit, a secondary amplifying circuit, a zero setting circuit, a Hall power supply circuit, a linear stabilized voltage power supply and an electric quantity indicating circuit are integrated on the integrated circuit board, and the outer side of the hand-held device is provided with a zero setting knob, an electric quantity indicating lamp and a gear switch; when measuring current, the current loop is not required to be damaged or the insulating layer is not required to be stripped, the alternating current and direct current which are not more than 65 amperes can be directly measured, the measuring frequency reaches 20KHz, and the maximum diameter of the measurable conductor is 10 centimeters.

Description

Current probe

Technical Field

The invention relates to the technical field of measurement, in particular to a current probe.

Background

If the longer cable has electric leakage or is damaged, the situation is not easy to judge, and when a certain part of the cable is measured to have current, the cable needs to be stripped for measurement, so that the cable is damaged; in addition, in some devices with narrow space, if a certain part of the conducting wire is damaged, the judgment is not good;

generally, the above situations occur, and an ammeter pen is used for measuring whether current exists, but the ammeter pen can only measure the parts at two ends of a wire, the wire wrapped in the middle of the wire cannot be measured, the ammeter pen cannot measure the current, and the influence on common mode rejection ratio, input impedance, noise, linear error and the like cannot be avoided;

the prior art can not meet the requirements of people at the present stage, and the prior art is urgently needed to be reformed based on the current situation.

Disclosure of Invention

The present invention is directed to a current probe, which solves the above problems of the prior art.

The invention provides a current probe which comprises a hand-held device and a head measuring assembly, wherein the hand-held device comprises a handle, a probe body and a probe head;

the inner side of the hand-held device is provided with an integrated circuit board, and a primary amplifying circuit, a secondary amplifying circuit, a zero setting circuit, a Hall power supply circuit, a linear voltage-stabilized power supply and an electric quantity indicating circuit are integrated on the integrated circuit board;

the input end of the primary amplifying circuit is coupled with the first Hall element and the second Hall element, and the primary amplifying circuit comprises a continuous amplifying circuit and a gear adjusting amplifying circuit;

preferably, the continuous amplifying circuit comprises a first amplifier U3B and a second amplifier U1B, the gear adjusting amplifying circuit comprises a third amplifier U3A and a first resistor network and a second resistor network which are connected in parallel, and the first resistor network and the second resistor network are loaded at the inverting input end of the third amplifier U3A

Preferably, the first resistance network and the second resistance network are respectively provided with gear adjusting endpoints SW-1 and SW-2; the gear adjusting endpoint SW-1 is coupled with a pin No. 1 of the gear switch, and the gear adjusting endpoint SW-2 is coupled with a pin No. 2 of the gear switch;

the first-stage amplifying circuit has the beneficial effects that: the first-stage amplifying circuit uses three operational amplifiers to form an instrument amplifier to amplify signals generated by the Hall element, and the unique structure of the first-stage amplifying circuit enables the first-stage amplifying circuit to have high common mode rejection ratio, high input impedance, low noise, low linear error, low offset drift gain and more flexible setting.

The secondary amplification circuit is provided with a fourth amplifier U1A, the output end of the primary amplification circuit is coupled with the inverting input end of the fourth amplifier U1A, and the positive input end of the fourth amplifier U1A is coupled with the zero setting circuit; the output end of the secondary amplifying circuit is coupled with a coiled cable or a BNC head cable with a straight banana plug;

preferably, the zero setting circuit is provided with an adjustable potentiometer, and the output zero is adjusted by changing the output voltage bias through the adjustable potentiometer;

the secondary amplification circuit has the beneficial effects that: the second-stage amplification circuit adopts the reverse amplifier to amplify signals, and the bandwidth range of the circuit is effectively enlarged by adopting the second-stage amplification circuit.

The linear voltage-stabilized power supply is provided with a power supply battery which is coupled with the gear switch;

the electric quantity indicating circuit comprises a comparator, a reference voltage is loaded on a positive input end of the comparator, a red LED indicating lamp and a green LED indicating lamp are coupled on an output end of the comparator,

electric quantity indicating circuit beneficial effect: whether can audio-visually observe current clamp and be in normal operating condition, and can in time know whether power supply battery's power supply electric quantity is sufficient, light the back when red LED pilot lamp, explain that power supply battery supplies power inadequately, in time charge or change power supply battery for measure more accurately, avoid leading to the measured data inaccurate because of the power supply is not enough.

A zero setting knob, an electric quantity indicator light and a gear switch are arranged on the outer side of the hand-held device, wherein the zero setting knob is coupled with a zero setting circuit;

the electric quantity indicator lamp comprises an indicator lamp with normal power supply and a low-electric-quantity indicator lamp, and is coupled with the electric quantity indicator circuit;

the gear switch comprises an off gear, a 1mV/10mA gear and a 1mV/100mA gear;

preferably, the 1mV/10mA tap is coupled with a tap adjusting endpoint SW-1 of the first resistor network, and the 1mV/100mA tap is coupled with a tap adjusting endpoint SW-2 of the second resistor network;

the gear switch has the beneficial effects that: when the gear switch is adjusted to a 1mV/10mA gear, a copper sliding sheet in the gear switch is coupled with a gear adjusting endpoint SW-1 of the first resistance network, when the gear switch is adjusted to a 1mV/100mA gear, the copper sliding sheet in the gear switch is coupled with a gear adjusting endpoint SW-1 of the first resistance network and a gear adjusting endpoint SW-2 of the second resistance network at the same time, the gear adjusting endpoint SW-1 and the gear adjusting endpoint SW-2 are connected in parallel, so that the resistance value of a new resistance network formed after the first resistance network and the second resistance network are connected in parallel is reduced, a signal is amplified by a third amplifier U3A, the measurement range is expanded, the gear switch can adjust the measurement range in real time according to the size of a measurement parameter, and the measurement data are more accurate.

The hand-held device is also provided with an anti-skid fixing component, the anti-skid fixing component comprises a plurality of fixing blocks made of plastic or rubber materials, one surface of each fixing block is outwards protruded, the other surface of each fixing block is fixedly connected with the hand-held device, and the fixing blocks are uniformly arranged on the side surface of the hand-held device every 2 centimeters;

subassembly beneficial effect is fixed in antiskid: the side of holding the device is equipped with 4 fixed blocks, just places staff's middle finger, ring finger and little finger respectively in the interval between 4 fixed blocks, and staff's forefinger is placed on toggle switch, can effectively prevent the condition that the palm gripped and skidded during the use.

The outer side of the hand-held device is also provided with an output interface, and the output end of the secondary amplifying circuit is coupled with a coiled cable or a BNC plug cable with a straight banana plug;

the output interface has the beneficial effects that: the coiled cable or the BNC head cable with the straight banana plug extends out of the external measuring equipment through the output interface; the coil cable with the straight banana plug is used for connecting a universal meter to measure data, and the BNC head cable is used for connecting oscilloscope to measure data.

The head measuring assembly comprises an upper limb jaw and a lower limb jaw, and one end of the lower limb jaw is fixedly connected with a toggle switch;

toggle switch beneficial effect: the toggle switch is toggled downwards to drive the jaw of the lower limb to open, when a wire with a larger diameter is measured, the wire is more easily arranged between the jaw of the upper limb and the jaw of the lower limb, and the problem that the wire is too thick and is difficult to measure is effectively solved;

the inner side of the upper limb jaw is provided with a first iron core and a second iron core, the inner side of the lower limb jaw is provided with a third iron core and a fourth iron core, the first iron core, the second iron core, the third iron core and the fourth iron core form a magnetic field loop, and the flow direction of a magnetic field in the magnetic field formed by the upper limb jaw and the lower limb jaw is first iron core → second iron core → third iron core → fourth iron core → first iron core; a first Hall element is arranged between the first iron core and the second iron core, and a second Hall element is arranged between the third iron core and the fourth iron core; the No. 1 pin and the No. 3 pin of the first Hall element and the second Hall element are coupled with the Hall power supply circuit; the No. 2 pin and the No. 4 pin of the first Hall element and the second Hall element are coupled with a first-stage amplifying circuit;

head measuring assembly beneficial effect: when the current of the cable is measured, the cable is placed between an upper limb jaw and a lower limb jaw, a magnetic field loop is formed by the first iron core, the second iron core, the third iron core and the fourth iron core, signals sensed by the first Hall element and the second Hall element are processed by the first-stage amplification circuit and the second-stage amplification circuit, the output end of the second-stage amplification circuit is coupled with a coiled cable with a straight banana plug or a BNC head cable to be externally connected with a universal meter or an oscilloscope, and the current can be measured by calculating data displayed on the universal meter or the oscilloscope; when measuring current, the current loop is not required to be damaged or the insulating layer is not required to be stripped, the alternating current and direct current which are not more than 65 amperes can be directly measured, the measuring frequency reaches 20KHz, and the maximum diameter of the measurable conductor is 10 centimeters.

Drawings

FIG. 1 is a schematic diagram of the working process of the present invention;

FIG. 2 is a block diagram of the circuit structure of the present invention;

FIG. 3 is an overall circuit diagram of the present invention;

FIG. 4 is a schematic view of the outer structure of the present invention;

FIG. 5 is a schematic view of the internal structure of the present invention;

fig. 6 is a circuit diagram of the power supply battery coupled to the inhibitor switch according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the invention without making any creative effort, shall fall within the protection scope of the invention.

referring to fig. 1, 2 and 3, an integrated circuit board is disposed on the inner side of the hand-held device, and a primary amplifying circuit, a secondary amplifying circuit, a zero setting circuit, a hall power supply circuit, a linear voltage-stabilized power supply and an electric quantity indicating circuit are integrated on the integrated circuit board;

the input end of the primary amplifying circuit is coupled with the first Hall element and the second Hall element, the primary amplifying circuit comprises a continuous amplifying circuit and a gear adjusting amplifying circuit, the continuous amplifying circuit comprises a first amplifier U3B and a second amplifier U1B, the gear adjusting amplifying circuit comprises a third amplifier U3A, a first resistor network and a second resistor network which are connected in parallel, the first resistor network and the second resistor network are loaded on the reverse input end of the third amplifier U3A, and the first resistor network and the second resistor network are respectively provided with gear adjusting endpoints SW-1 and SW-2; the gear adjusting endpoint SW-1 is coupled with a pin No. 1 of the gear switch, and the gear adjusting endpoint SW-2 is coupled with a pin No. 2 of the gear switch; the first-stage amplifying circuit uses three operational amplifiers to form an instrument amplifier to amplify signals generated by the Hall element, and the unique structure of the first-stage amplifying circuit enables the first-stage amplifying circuit to have high common mode rejection ratio, high input impedance, low noise, low linear error, low offset drift gain and more flexible setting.

The secondary amplification circuit is provided with a fourth amplifier U1A, the output end of the primary amplification circuit is coupled with the reverse input end of a fourth amplifier U1A, the positive input end of the fourth amplifier U1A is coupled with a zero-setting circuit, the zero-setting circuit is provided with an adjustable potentiometer, and the output voltage bias is changed through the adjustable potentiometer to realize the adjustment of output zero; the output end of the secondary amplifying circuit is coupled with a coiled cable or a BNC head cable with a straight banana plug; the second-stage amplification circuit adopts the reverse amplifier to amplify signals, and the bandwidth range of the circuit is effectively enlarged by adopting the second-stage amplification circuit.

Referring to fig. 6, the linear voltage regulator has a power supply battery coupled to the gearshift switch to supply power to the whole device.

The electric quantity indicating circuit comprises a comparator, wherein a reference voltage is loaded at the positive input end of the comparator, a red LED indicating lamp and a green LED indicating lamp are coupled at the output end of the comparator, the red LED indicating lamp is used for prompting low electric quantity, and the green LED indicating lamp is used for prompting working state; the power supply battery electric quantity of linear constant voltage power supply crosses lowly and can lead to the voltage reduction, the comparator detects this voltage and carries out the comparison with reference voltage, when the voltage that the comparator detected is less than reference voltage, comparator output signal lights red LED pilot lamp, electric quantity indicating circuit can audio-visual observation current clamp be in normal operating condition, and can in time know whether power supply battery's power supply electric quantity is sufficient, light the back when red LED pilot lamp, it is not enough to explain power supply battery power supply, in time charge or change power supply battery, make the measurement more accurate, avoid leading to the measured data inaccurate because of the power supply is not enough.

Referring to fig. 4, a zero setting knob 4, an electric quantity indicating lamp 3 and a gear switch 2 are arranged on the outer side of the hand-held device 1, wherein the zero setting knob 4 is coupled to a zero setting circuit; the electric quantity indicator lamp 3 comprises an indicator lamp for normal power supply and a low electric quantity indicator lamp, and the electric quantity indicator lamp 3 is coupled with an electric quantity indicator circuit;

the gear switch 2 comprises an off gear, a 1mV/10mA gear and a 1mV/100mA gear, wherein the 1mV/10mA gear is coupled with a gear adjusting endpoint SW-1 of the first resistance network, and the 1mV/100mA gear is coupled with a gear adjusting endpoint SW-2 of the second resistance network; when the gear switch is adjusted to a 1mV/10mA gear, a copper sliding sheet in the gear switch is coupled with a gear adjusting endpoint SW-1 of the first resistance network, when the gear switch is adjusted to a 1mV/100mA gear, the copper sliding sheet in the gear switch is coupled with a gear adjusting endpoint SW-1 of the first resistance network and a gear adjusting endpoint SW-2 of the second resistance network at the same time, the gear adjusting endpoint SW-1 and the gear adjusting endpoint SW-2 are connected in parallel, so that the resistance value of a new resistance network formed after the first resistance network and the second resistance network are connected in parallel is reduced, a signal is amplified by a third amplifier U3A, the measurement range is expanded, the gear switch can adjust the measurement range in real time according to the size of a measurement parameter, and the measurement data are more accurate.

The hand-held device 1 is also provided with an anti-skid fixing component, the anti-skid fixing component comprises a plurality of fixing blocks 8 which are made of plastic or rubber materials, one surface of each fixing block is outwards protruded, the other surface of each fixing block is fixedly connected with the hand-held device, and the fixing blocks 8 are uniformly arranged on the side surface of the hand-held device every 2 centimeters; the side of holding the device is equipped with 4 fixed blocks, just places staff's middle finger, ring finger and little finger respectively in the interval between 4 fixed blocks, and staff's forefinger is placed on toggle switch, can effectively prevent the condition that the palm gripped and skidded during the use.

The outer side of the hand-held device 1 is also provided with an output interface 9, the output end of the secondary amplifying circuit is coupled with a coiled cable or a BNC plug cable with a straight banana plug, and the coiled cable or the BNC head cable with the straight banana plug extends out of the external measuring equipment through the output interface; the coil cable with the straight banana plug is used for connecting a universal meter to measure data, and the BNC head cable is used for connecting oscilloscope to measure data.

Referring to fig. 5, the head measurement assembly includes an upper limb jaw 5 and a lower limb jaw 6, and one end of the lower limb jaw 6 is fixedly connected with a toggle switch 7, the toggle switch 7 is toggled downwards to drive the lower limb jaw 6 to open, when a wire with a larger diameter is measured, the wire is more easily placed between the upper limb jaw 5 and the lower limb jaw 6, and the problem that the wire is too thick and is not easy to measure is effectively solved; a first iron core 10 and a second iron core 11 are arranged on the inner side of the upper limb jaw 5, a third iron core 12 and a fourth iron core 13 are arranged on the inner side of the lower limb jaw 6, the first iron core 10, the second iron core 11, the third iron core 12 and the fourth iron core 13 form a magnetic field loop, and the magnetic field flows in the magnetic field formed by the upper limb jaw 5 and the lower limb jaw 6 and is the first iron core → the second iron core → the third iron core → the fourth iron core → the first iron core; a first hall element 14 is arranged between the first iron core 10 and the second iron core 11, and a second hall element 15 is arranged between the third iron core 12 and the fourth iron core 13; the No. 1 pin and the No. 3 pin of the first Hall element 14 and the second Hall element 15 are coupled with a Hall power supply circuit; the No. 2 pin and the No. 4 pin of the first Hall element 14 and the second Hall element 15 are coupled with a primary amplifying circuit; when the current of the cable is measured, the cable is placed between an upper limb jaw 5 and a lower limb jaw 6, because a magnetic field loop is formed by a first iron core 10, a second iron core 11, a third iron core 12 and a fourth iron core 13, signals sensed by a first Hall element 14 and a second Hall element 15 are processed by a first-stage amplifying circuit and a second-stage amplifying circuit, and then a coiled cable with a straight banana plug or a BNC head cable is connected with a universal meter or an oscilloscope through the output end of the second-stage amplifying circuit in a coupling mode, and the measurement of the current can be realized by calculating data displayed on the universal meter or the oscilloscope; when measuring current, the current loop is not required to be damaged or the insulating layer is not required to be stripped, the alternating current and direct current which are not more than 65 amperes can be directly measured, the measuring frequency reaches 20KHz, and the maximum diameter of the measurable conductor is 10 centimeters.

When the device is connected with a multimeter, a black banana head pin is inserted into a COM end of the multimeter, a red banana head pin is inserted into a V-omega end, and the minimum input impedance of the multimeter is 10K ohms; when the current clamp is connected with an oscilloscope, a BNC plug of the current clamp is connected with a BNC interface of the oscilloscope through a BNC connector; during measurement, the gear switch is switched from a closed gear to a gear required by current measurement, namely a copper slide sheet in the gear switch is pushed to point to a 1mV/10mA gear or a 1mV/100mA gear, after the current clamp supplies power normally, a green power supply indicator lamp is lightened, when the electric quantity of a power supply battery 16 of a linear stabilized power supply is too low, voltage is reduced, a comparator detects the voltage and compares the voltage with reference voltage, when the voltage detected by the comparator is lower than the reference voltage, the comparator outputs a signal to lighten a red LED indicator lamp, when the measured current is not more than 2 amperes, the current clamp is set to be the 1mV/10mA gear, and meanwhile, according to the type of the measured current, an alternating current 200mV gear or a direct current 200mV gear is selected on a universal meter for measurement;

when measuring direct current, zero setting operation is required before measurement, a zero setting button of a current clamp is pressed until the reading on the multimeter is 0, and then the zero setting button is released; when the oscilloscope is connected to measure direct current, the oscilloscope selects direct current coupling, a zero setting button of the current clamp is pressed until a glow line of the oscilloscope returns to a reference position before measurement, and then the zero setting button is released, when a 1mV/10mA gear of the current clamp is selected, data (unit is mV) measured by the multimeter or the oscilloscope is multiplied by 10 to obtain an actual current value, the unit of the current value is mA, for example, the value measured by the current multimeter is 10mV, and the actual current value of the current-measured current-carrying conductor is 10 multiplied by 10 to 100 mA. When the 1mV/100mA grade of the current clamp is selected, the actual current value is obtained by multiplying the data measured by a universal meter or an oscilloscope by 100, and the unit of the current value is mA; for example, when the current multimeter measures 5mV, the actual current value of the current-carrying conductor to be measured is 5 × 100 — 500mA, and when an oscilloscope is connected to measure the alternating current, the peak value and the effective value of the alternating current are measured by using the measurement function of the oscilloscope, and the peak value and the effective value of the alternating current are obtained according to the corresponding relationship between the voltage and the current according to the gear position of the current clamp, wherein the magnitude of the alternating current is represented by the effective value.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. A current probe, comprising: a hand-held device (1) and a head measurement assembly;

the inboard of holding device (1) is equipped with integrated circuit board, integrated on the integrated circuit board has:

the input end of the first-stage amplifying circuit is coupled with the first Hall element and the second Hall element, and the first-stage amplifying circuit comprises a continuous amplifying circuit and a gear adjusting amplifying circuit;

the second-stage amplifying circuit is provided with a fourth amplifier, the output end of the first-stage amplifying circuit is coupled with the reverse input end of the fourth amplifier, and the positive input end of the fourth amplifier is coupled with the zero setting circuit;

the linear voltage-stabilized power supply is provided with a power supply battery (16), and the power supply battery is coupled with the gear switch;

the electric quantity indicating circuit comprises a comparator, wherein a reference voltage is loaded at the positive input end of the comparator, and a red LED indicating lamp and a green LED indicating lamp are coupled at the output end of the comparator;

a zero setting knob 4, an electric quantity indicator lamp 3 and a gear switch 2 are arranged on the outer side of the hand-held device 1; wherein the content of the first and second substances,

the zero setting knob (4) is coupled with a zero setting circuit;

the electric quantity indicator lamp (3) comprises an indicator lamp with normal power supply and a low electric quantity indicator lamp, and the electric quantity indicator lamp (3) is coupled with an electric quantity indicator circuit;

the gear switch (2) comprises an off gear, a 1mV/10mA gear and a 1mV/100mA gear;

the head measuring assembly comprises an upper limb jaw (5) and a lower limb jaw (6);

the upper limb jaw (5) is internally provided with a first iron core (10) and a second iron core (11), the lower limb jaw (6) is internally provided with a third iron core (12) and a fourth iron core (13), the first iron core (10), the second iron core (11), the third iron core (12) and the fourth iron core (13) form a magnetic field loop, and a magnetic field flows to the inside of a magnetic field formed by the upper limb jaw (5) and the lower limb jaw (6) and is divided into the first iron core (10) → the second iron core (11) → the third iron core (12) → the fourth iron core (13) → the first iron core (10);

a first Hall element (14) is arranged between the first iron core (10) and the second iron core (11), and a second Hall element (15) is arranged between the third iron core (12) and the fourth iron core (13);

the head measuring assembly can directly measure alternating current and direct current of 65 amperes at most, the measuring frequency reaches 20KHz, and the maximum diameter of a measurable conductor is 10 centimeters.

2. A current probe according to claim 1, wherein: the continuous amplification circuit comprises a first amplifier and a second amplifier;

the gear adjusting and amplifying circuit comprises a third amplifier, a first resistance network and a second resistance network which are connected in parallel, and the first resistance network and the second resistance network are loaded at the reverse input end of the third amplifier.

3. A current probe according to claim 2, wherein: the first resistance network and the second resistance network are respectively provided with gear adjusting endpoints SW-1 and SW-2; the gear adjusting endpoint SW-1 is coupled with a pin No. 1 of the gear switch (2), and the gear adjusting endpoint SW-2 is coupled with a pin No. 2 of the gear switch (2).

4. A current probe according to claim 1, wherein: the zero setting circuit is provided with an adjustable potentiometer, and the output voltage bias is changed through the adjustable potentiometer to realize the adjustment of output zero.

5. A current probe according to claim 1, wherein: the outer side of the hand-held device (1) is further provided with an output interface (9), the output end of the second-stage amplifying circuit is coupled with a cable or a BNC head cable with a straight banana plug, the straight banana plug extends out of an external universal meter through the output interface, and the BNC head cable extends out of an external oscilloscope through the output interface.

6. A current probe according to claim 1, wherein: the 1mV/10mA tap is coupled to a tap adjustment terminal SW-1 of the first resistive network, and the 1mV/100mA tap is coupled to a tap adjustment terminal SW-2 of the second resistive network.

7. A current probe according to claim 1, wherein: the gear switch (2) is adjusted to a 1mV/10mA gear, and a copper slide sheet in the gear switch (2) is coupled with a gear adjusting endpoint SW-1 of the first resistance network;

the gear switch (2) is adjusted to a 1mV/100mA gear, a copper slide sheet in the gear switch (2) is simultaneously coupled with a gear adjusting endpoint SW-1 of the first resistor network and a gear adjusting endpoint SW-2 of the second resistor network, and the gear adjusting endpoint SW-1 and the gear adjusting endpoint SW-2 are connected in parallel, so that the resistance value of a new resistor network formed after the first resistor network and the second resistor network are connected in parallel is reduced, and the measuring range is enlarged.

8. A current probe according to claim 1, wherein: the device is characterized in that an anti-skidding fixing component is further arranged on the outer side of the hand-holding device (1), the anti-skidding fixing component comprises a plurality of plastic or rubber materials, a face protruding outwards and a fixed block (8) fixedly connected with the hand-holding device, and the fixed block (8) is evenly arranged on the side face of the hand-holding device (1) every 2 centimeters.

9. A current probe according to claim 1, wherein: lower limbs keep silent (6) one end rigid coupling has toggle switch (7), and this toggle switch (7) are stirred downwards and can be driven lower limbs keep silent (6) and open, realize the thicker conductor measurement of diameter.

10. A current probe according to claim 1, wherein: and the integrated circuit board is also integrated with a Hall power supply circuit, and the No. 1 pin and the No. 3 pin of the first Hall element and the second Hall element are both coupled with the Hall power supply circuit.