CN204374273U - A kind of handheld digital secondary pressure plate measuring instrument - Google Patents

A kind of handheld digital secondary pressure plate measuring instrument Download PDF

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Publication number
CN204374273U
CN204374273U CN201420731289.XU CN201420731289U CN204374273U CN 204374273 U CN204374273 U CN 204374273U CN 201420731289 U CN201420731289 U CN 201420731289U CN 204374273 U CN204374273 U CN 204374273U
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China
Prior art keywords
resistance
pressure plate
operational amplifier
module
input
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Application number
CN201420731289.XU
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Chinese (zh)
Inventor
李柯睿
王铁柱
祁含
高士森
蔡素雄
谢旭琛
韦园清
卓定明
戴广平
魏昌东
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Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Abstract

A kind of handheld digital secondary pressure plate measuring instrument, comprise hand-held housing, be installed on test circuit in shell and display screen, this measuring instrument has three measurement test pencils, described test circuit comprises supply module, voltage measurement module and display module, supply module provides stabilized power source VCC, each module is all connected with single-chip microcomputer U, described voltage test module comprises two addition metering circuits, wherein two measurement test pencils and two addition metering circuits connect and are used for measuring mouth with secondary pressure plate and contact, an other measurement test pencil ground connection.The utility model uses simple and easy, be applicable to the secondary pressure plate of the device that measurement adopts the positive and negative 110V of direct current, positive and negative 55V, positive and negative 24V power, secondary pressure plate two ends voltage-to-ground can be measured simultaneously, whether intelligent decision meets pressing plate is dropped into condition, and adopt hand-held designs, flexibly and easily, effectively improve secondary pressure plate voltage measurement efficiency and reduce misoperation fault.

Description

A kind of handheld digital secondary pressure plate measuring instrument
Technical field
The utility model relates to the improvement of secondary pressure plate measuring technique.
Background technology
For preventing, when measuring relay protection or aut.eq. secondary pressure plate voltage, causing the situation of power transmission and transforming equipment mistrip because of error, execute-in-place regulations stipulate can drop into after needing measuring pressure plate two ends voltage-to-ground before dropping into pressing plate.But Zeng Yinwei multimeter gear selects mistake and operations staff drop into the unfamiliar situation of condition to secondary pressure plate and cause device to export trip accident in practical operation by mistake.In addition, when using common multimeter to measure secondary pressure plate voltage, can only measure one end and survey the other end again, efficiency is not high.
Summary of the invention
In order to overcome deficiency of the prior art, the purpose of this utility model be to provide a kind of easy to use, can not the handheld digital secondary pressure plate measuring instrument of maloperation.
In order to solve the problem, the technical scheme of employing of the present utility model is as follows:
A kind of handheld digital secondary pressure plate measuring instrument, comprise hand-held housing, be installed on test circuit in shell and display screen, this measuring instrument has three measurement test pencils, described test circuit comprises supply module, voltage measurement module and display module, supply module provides stabilized power source VCC, each module is all connected with single-chip microcomputer U, described voltage measurement module comprises two addition metering circuits, wherein two measurement test pencils and two addition metering circuits connect and are used for measuring mouth with secondary pressure plate and contact, an other measurement test pencil ground connection.
Wherein, described addition metering circuit comprises the binding post connecting and measure test pencil, binding post is connected with the in-phase input end of operational amplifier one by voltage dependent resistor (VDR) R5 and multiple divider resistance, and the output terminal of this operational amplifier one is connected with single-chip microcomputer U input pin VTest by fast fuse wire F.
Wherein, described single-chip microcomputer U input pin VTest is by two electric capacity C1 in parallel, electric capacity C2 ground connection; Described operational amplifier one is also connected with divider resistance R1, resistance R2, resistance R3 and resistance R4 in the same way between input end and binding post, the intermediate node of resistance R1 and resistance R2 by electric capacity C3 parallel with one another, have electrode capacitance C4 and resistance R4 ground connection, binding post is by voltage dependent resistor (VDR) R5 ground connection; Operational amplifier one reverse input end is connected with output terminal with resistance R7 ground connection respectively by resistance R6; This operational amplifier one in the same way input end is connected with operational amplifier two output terminal by resistance R8, and operational amplifier two in the same way input end connects adjustable voltage input circuit, and operational amplifier two reverse input end is connected with its output terminal.
Wherein, adjustable voltage input circuit comprises the resistance R9, the resistance R10 that are series between power supply VCC and ground connection, and be connected to operational amplifier two in the same way between input end and resistance R9 resistance R10 at power supply VCC and an adjustable resistance R11, adjustable resistance R11 movable end of connecting between ground connection.
And described supply module comprises the self-lock switch S0 being connected to accumulator the two poles of the earth and power supply VCC and holding, and power supply VCC has electrode capacitance C5, electric capacity C6 and voltage dependent resistor (VDR) R12 ground connection by parallel with one another.
The utility model uses simple and easy, be applicable to the secondary pressure plate of the device that measurement adopts the positive and negative 110V of direct current, positive and negative 55V, positive and negative 24V power, secondary pressure plate two ends voltage-to-ground can be measured simultaneously, whether intelligent decision meets pressing plate is dropped into condition, and adopt hand-held designs, flexibly and easily, effectively improve secondary pressure plate voltage measurement efficiency and reduce misoperation fault.
Accompanying drawing explanation
Fig. 1 is utility model embodiment monnolithic case schematic diagram.
Fig. 2 is the present embodiment addition metering circuit schematic diagram.
Fig. 3 is the present embodiment supply module circuit diagram.
Fig. 4 is the present embodiment single-chip microcomputer U peripheral circuit schematic diagram.
Fig. 5 is the present embodiment display module schematic diagram.
Embodiment
In order to allow those skilled in the art understand the technical solution of the utility model better, below in conjunction with accompanying drawing, the utility model is further elaborated.
As shown in Figure 1.The small-sized secondary pressure plate measuring instrument of handheld digital secondary pressure plate measuring instrument for ease of portably using that the present embodiment discloses, this measuring instrument comprises hand-held housing 1, the test circuit be installed in shell 1, display screen 11 and supporting three measurement test pencil (not shown)s.Wherein, display screen 11 realizes data display by display module, and display module physical circuit schematic diagram can as shown in Figure 5, not describe in detail at this.Test circuit comprises supply module and voltage measurement module, and supply module provides stabilized power source VCC, and each module is all connected with single-chip microcomputer U.Described voltage measurement module comprises two addition metering circuits; wherein two measurement test pencils and two addition metering circuits connect and are used for measuring mouth with secondary pressure plate and contact; an other measurement test pencil ground connection; during normal use; two meter penholders be connected with addition metering circuit enter the measurement mouth of secondary pressure plate; an other test pencil is connected on the ground wire of relay protection or aut.eq.; single-chip microcomputer U measures the voltage of two-way addition metering circuit input; draw pressing plate two ends difference voltage over the ground, and judge whether to meet input condition.
In the present embodiment, single-chip microcomputer U can adopt LQFP48 single-chip microcomputer, and its peripheral circuit as shown in Figure 4, does not repeat at this.
Simultaneously, 8 LED light 2 are also provided with in shell 1 front, whether display screen 11 meets with display the prompting that pressing plate drops into condition for the voltage shown measured by single-chip microcomputer, 8 LED light, 2 point of two row, light on and off are controlled by single-chip microcomputer U, a behavior 0V above, + 24V, + 55V, + 110V, a line 0V below,-24V,-55V,-110V, such as a measurement test pencil records+55V, another records-55V, then+55V is bright with-55V two LED light, but the LED of 0V is a point test pencil, the LED light of 0V represents the 0V voltage of left side measurement measured by test pencil above, the LED light of that 0V just represents below is the voltage that measurement test pencil of the right records.
In the present embodiment, as described in accompanying drawing 2.Designed addition metering circuit is used for the magnitude of voltage that measurement test pencil records to compare to be converted to the acceptable signal of single-chip microcomputer U, test result is shown on display screen 11 by the process of single-chip microcomputer U inside.This addition metering circuit comprises the binding post 12(connecting measurement test pencil and is positioned at above shell 1), binding post 12 is connected with the in-phase input end of operational amplifier one by voltage dependent resistor (VDR) R5 and multiple divider resistance, the output terminal of this operational amplifier one is connected with single-chip microcomputer U input pin VTest by fast fuse wire F, this voltage dependent resistor (VDR) R5 can prevent from inputting superpotential, and fast fuse wire F prevents single-chip microcomputer internal short-circuit conducting ground connection.This single-chip microcomputer U input pin VTest passes through two electric capacity C1 in parallel, electric capacity C2 ground connection; This operational amplifier one is also connected with divider resistance R1, resistance R2, resistance R3 and resistance R4 in the same way between input end and binding post, the intermediate node of resistance R1 and resistance R2 by electric capacity C3 parallel with one another, have electrode capacitance C4 and resistance R4 ground connection, binding post is by voltage dependent resistor (VDR) R5 ground connection; Operational amplifier one reverse input end is connected with output terminal with resistance R7 ground connection respectively by resistance R6; This operational amplifier one in the same way input end is connected with operational amplifier two output terminal by resistance R8, and operational amplifier two in the same way input end connects adjustable voltage input circuit, and operational amplifier two reverse input end is connected with its output terminal.Wherein, adjustable voltage input circuit comprises the resistance R9, the resistance R10 that are series between power supply VCC and ground connection, and be connected to operational amplifier two in the same way between input end and resistance R9 resistance R10 at power supply VCC and an adjustable resistance R11, adjustable resistance R11 movable end of connecting between ground connection.
Again as shown in Figure 3, the supply module of the present embodiment design comprises the self-lock switch S0 being connected to accumulator the two poles of the earth and power supply VCC and holding, and power supply VCC has electrode capacitance C5, electric capacity C6 and voltage dependent resistor (VDR) R12 ground connection by parallel with one another.
The handheld digital secondary pressure plate measuring instrument that the present embodiment discloses adopts hand-held designs, and use flexibly, operation is very easy, effectively can improve and measures efficiency and reduce maloperation.And can measure secondary pressure plate two ends voltage-to-ground, whether intelligent decision meets pressing plate is dropped into condition simultaneously.
The above is better embodiment of the present utility model, not does any pro forma restriction to the utility model.It should be noted that; when not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the utility model, but these change and are out of shape the protection domain that all should belong to the claim appended by the utility model.

Claims (5)

1. a handheld digital secondary pressure plate measuring instrument, comprise hand-held housing (1), be installed on the test circuit in shell and display screen (11), it is characterized in that, this measuring instrument has three measurement test pencils, described test circuit comprises supply module, voltage measurement module and display module, supply module provides stabilized power source VCC, each module is all connected with single-chip microcomputer U, described voltage measurement module comprises two addition metering circuits, wherein two measurement test pencils and two addition metering circuits connect and are used for measuring mouth with secondary pressure plate and contact, an other measurement test pencil ground connection.
2. handheld digital secondary pressure plate measuring instrument according to claim 1, it is characterized in that, described addition metering circuit comprises the binding post connecting and measure test pencil, binding post is connected with the in-phase input end of operational amplifier one by voltage dependent resistor (VDR) R5 and multiple divider resistance, and the output terminal of this operational amplifier one is connected with single-chip microcomputer U input pin VTest by fast fuse wire F.
3. handheld digital secondary pressure plate measuring instrument according to claim 2, is characterized in that, described single-chip microcomputer U input pin VTest passes through two electric capacity C1 in parallel, electric capacity C2 ground connection; Described operational amplifier one is also connected with divider resistance R1, resistance R2, resistance R3 and resistance R4 in the same way between input end and binding post, the intermediate node of resistance R1 and resistance R2 by electric capacity C3 parallel with one another, have electrode capacitance C4 and resistance R4 ground connection, binding post is by voltage dependent resistor (VDR) R5 ground connection; Operational amplifier one reverse input end is connected with output terminal with resistance R7 ground connection respectively by resistance R6; This operational amplifier one in the same way input end is connected with operational amplifier two output terminal by resistance R8, and operational amplifier two in the same way input end connects adjustable voltage input circuit, and operational amplifier two reverse input end is connected with its output terminal.
4. handheld digital secondary pressure plate measuring instrument according to claim 3, it is characterized in that, adjustable voltage input circuit comprises the resistance R9, the resistance R10 that are series between power supply VCC and ground connection, and be connected to operational amplifier two in the same way between input end and resistance R9 resistance R10 at power supply VCC and an adjustable resistance R11, adjustable resistance R11 movable end of connecting between ground connection.
5. handheld digital secondary pressure plate measuring instrument according to claim 1, it is characterized in that, described supply module comprises the self-lock switch S0 being connected to accumulator the two poles of the earth and power supply VCC and holding, and power supply VCC has electrode capacitance C5, electric capacity C6 and voltage dependent resistor (VDR) R12 ground connection by parallel with one another.
CN201420731289.XU 2014-11-28 2014-11-28 A kind of handheld digital secondary pressure plate measuring instrument Active CN204374273U (en)

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Application Number Priority Date Filing Date Title
CN201420731289.XU CN204374273U (en) 2014-11-28 2014-11-28 A kind of handheld digital secondary pressure plate measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420731289.XU CN204374273U (en) 2014-11-28 2014-11-28 A kind of handheld digital secondary pressure plate measuring instrument

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CN204374273U true CN204374273U (en) 2015-06-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113311217A (en) * 2021-07-02 2021-08-27 广东电网有限责任公司 Potential measuring device for protective pressing plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113311217A (en) * 2021-07-02 2021-08-27 广东电网有限责任公司 Potential measuring device for protective pressing plate

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