CN206208963U

CN206208963U - A kind of digital voltmeter of automatic range switching

Info

Publication number: CN206208963U
Application number: CN201621273302.7U
Authority: CN
Inventors: 胡丽萍
Original assignee: Baotou Zhong Ren Technology Co Ltd
Current assignee: Baotou Zhong Ren Technology Co Ltd
Priority date: 2016-11-24
Filing date: 2016-11-24
Publication date: 2017-05-31
Anticipated expiration: 2026-11-24

Abstract

The utility model discloses a kind of digital voltmeter of automatic range switching, including processor STC89C51, clock module, reseting module, display module, A/D conversion modules, photovoltaic conversion module, measurement range selection module and input module, it is characterised in that the STC89C51 as the system core processor；The reseting module is to measurement voltage amplitude treatment；The display module is high brightness numeral method, with the 2.0~P2.3 of port of AT89C51 single-chip microcomputers as 4 display controls of LED charactrons；The single-chip microcomputer is connected with A/D conversion chips ADC0808；The A/D conversion chips ADC0808 connection amplification chips LM324；The LM324 connects 74HC4066 chips, and 74HC4066 connects resistance, and potentiometer is used as on-off circuit；The digital voltmeter of the utility model automatic range switching, using high brightness numeral method, two ranges of design are automatically switched, and realize intellectuality, and its measurement accuracy of hardware operation is higher, and display effect satisfaction receives scope, is especially suitable for promoting the use of.

Description

A kind of digital voltmeter of automatic range switching

Technical field

The utility model is related to a kind of voltmeter, specifically a kind of digital voltmeter of automatic range switching.

Background technology

The development of current China modernization construction, detection of electrons product makes rapid progress, the particularly appearance of single-chip microcomputer, Cause the new technological revolution in measuring and controlling instrument table field, digital voltmeter then utilizes singlechip technology combination A/D conversion chips, Continuous analog quantity is converted into discontinuous, discrete digital form and is subject to display instrument, but in most schools laboratory Interior most still in the universal meter using inconvenience section, this does task to away match and brings inconvenience.

Utility model content

The purpose of this utility model is to provide a kind of digital voltmeter of automatic range switching, to solve above-mentioned background skill The problem proposed in art.

To achieve the above object, the utility model provides following technical scheme：

A kind of digital voltmeter of automatic range switching, including processor STC89C51, clock module, reseting module show Show module, A/D conversion modules, photovoltaic conversion module, measurement range selection module and input module；The STC89C51 is used as the system Core processor；The reseting module is to measurement voltage amplitude treatment；The display module is high brightness numeral method, is used 2.0~the P2.3 of port of AT89C51 single-chip microcomputers is used as 4 display controls of LED charactrons；The single-chip microcomputer changes core with A/D Piece ADC0808 is connected；The A/D conversion chips ADC0808 connection amplification chips LM324；The LM324 connects 74HC4066 cores Piece, 74HC4066 connection resistance, potentiometer is used as on-off circuit.

As further program of the utility model：The processor chips model STC89C51.

As further program of the utility model：The A/D conversion chips model ADC0808.

As further program of the utility model：The amplifier chip model LM324.

Compared with prior art, the beneficial effects of the utility model are：The numeral electricity of the utility model automatic range switching Pressure table, using high brightness numeral method, two ranges of design are automatically switched, and realize intelligent, hardware operation its measurement Accuracy is higher, and display effect satisfaction receives scope, and circuit is relatively simple, and low cost, stability is higher, in measurement It is more accurate during small voltage, it is especially suitable for promoting the use of.

Brief description of the drawings

Fig. 1 is the structural representation of the digital voltmeter system of automatic range switching.

Fig. 2 is the structural representation of the digital voltmeter principle of automatic range switching.

Specific embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model example is carried out clearly Chu, it is fully described by.

Refer to Fig. 1-2, a kind of digital voltmeter of automatic range switching, including processor STC89C51, clock module, Reseting module, display module, A/D conversion modules, photovoltaic conversion module, measurement range selection module and input module；It is described STC89C51 as the system core processor；The reseting module is to measurement voltage amplitude treatment；The display module is High brightness numeral method, with the 2.0~P2.3 of port of AT89C51 single-chip microcomputers as 4 display controls of LED charactrons；Institute Single-chip microcomputer is stated to be connected with A/D conversion chips ADC0808；The A/D conversion chips ADC0808 connection amplification chip LM324, LM324 allows the voltage signal for detecting to be amplified treatment；The LM324 connects 74HC4066 chips, allows 74HC4066 to open Pass uses；The input module detects voltage signal, supplies range selecting module, measurement range selection modular circuit automatic switchover amount Journey, service voltage conversion module, voltage transformation module inputs to A/D change-over circuits, and voltage signal is changed into data signal supplies Processed to single-chip microcomputer；During the measurement low-voltage, amplified device circuit realiration amplifies, high voltage through big electric resistance partial pressure so as to The signal of control input ADC0808 is changed in A/D and sends into LED numeral methods through AT89C51, realizes analogue measurement, draws knot Fruit numerical monitor, processor chips model STC89C51, A/D conversion chip model ADC0808, amplifier chip model It is LM324.

Operation principle of the present utility model is：Refer to Fig. 1-2, the digital voltage of the utility model automatic range switching Table, with STC89C51 single-chip microcomputer action control systems, during measurement low-voltage, through proportional amplifier（LM324）Circuit realiration amplifies, and puts Big multiple is 10 times, high voltage through big electric resistance partial pressure so as to the signal of control input ADC0808 gives in A/D conversions through AT89C51 Enter LED numeral methods, realize analogue measurement, as a result with numerical monitor, during experiment, when surveyed voltage is more than 500mv, P2.4 Output low level, the analog switch 74HC4066 closed in 500mv gear circuits, and P2.5 output high level, open 10v gears The circuit normal work of analog switch 74HC4066, the 10v gear in circuit, it is easy to which ground realizes two amounts of 500mv and 10v Journey automatically switches.

It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and And in the case of without departing substantially from spirit or essential attributes of the present utility model, can realize that this practicality is new with other concrete forms Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new The scope of type limits by appended claims rather than described above, it is intended that the equivalency fallen in claim is contained The all changes of justice and scope are included in the utility model.Any reference in claim should not be considered as limitation involved And claim, although moreover, it will be appreciated that the present specification is described in terms of embodiments, not each embodiment party Formula only includes an independent technical scheme, and this narrating mode of specification is only people in the art for clarity Member should be using specification an as entirety, and the technical scheme in each embodiment can also be through appropriately combined, form this area skill Art personnel may be appreciated other embodiment.

Claims

1. a kind of digital voltmeter of automatic range switching, including processor STC89C51, clock module, reseting module, display Module, A/D conversion modules, photovoltaic conversion module, measurement range selection module and input module, it is characterised in that the STC89C51 As the core processor of the system；The reseting module is to measurement voltage amplitude treatment；The display module is the highlighted number of degrees Code pipe shows, with the 2.0~P2.3 of port of AT89C51 single-chip microcomputers as 4 display controls of LED charactrons；The single-chip microcomputer It is connected with A/D conversion chips ADC0808；The A/D conversion chips ADC0808 connection amplification chips LM324；The LM324 connects 74HC4066 chips are connect, 74HC4066 connects resistance, and potentiometer is used as on-off circuit.

2. the digital voltmeter of automatic range switching according to claim 1, it is characterised in that the processor chips type Number be STC89C51.

3. the digital voltmeter of automatic range switching according to claim 1, it is characterised in that the A/D conversion chips Model ADC0808.

4. the digital voltmeter of automatic range switching according to claim 1, it is characterised in that the amplifier chip type Number be LM324.