CN87214947U

CN87214947U - Peak voltage measuring apparatus

Info

Publication number: CN87214947U
Application number: CN 87214947
Authority: CN
Inventors: 张永明; 康长征; 洪建萍; 徐双满
Original assignee: Beijing Jiaotong University
Current assignee: Beijing Jiaotong University
Priority date: 1987-11-06
Filing date: 1987-11-06
Publication date: 1988-10-12

Abstract

The utility model provides a peak voltage measuring apparatus, which is mainly used for measuring peak voltage output by various sensors, particularly, measuring the vibration peak values of various machines (such as machine tools, engines, vessels, etc.) and dynamic balancing machines by matching with magnetoelectric sensors. The utility model is composed of a signal input device, a first-stage low pass filter, an amplifying circuit, a second-stage low pass filter, a peak voltage collector and a digital voltmeter (output). The utility model has the advantages of accurate reading, sensitive reaction, small size, low cost, and convenient operation.

Description

Peak voltage measuring apparatus

The utility model is a kind of digital crest voltage measuring instrument.It is mainly used in the crest voltage of measuring various sensor outputs.The crest voltage of sensor output has reflected the peak value of sensor input physical quantity.With mechanical industry is example, the utility model cooperates with magnetoelectric sensor, can measure the vibration (for example lathe, engine, boats and ships or the like) of various machineries, obtain their vibration peak (being resonance point), for eliminating resonance, improving mechanical property foundation is provided.Can also be used to measure the vibration peak of dynamic balancing machine, and then obtain the weight and the position of uneven amount on the rotor, for balancing rotor provides foundation.But currently used means of testing is to cooperate with vialog with magnetoelectric sensor, and its subject matter has following four aspects:

(1), vialog adopts is pointer gauge outfit, its measuring accuracy is low, and slower to the peak voltage reaction.

(2), vialog adopts pointer header, the operator is difficult for reading accurate values.

(3), pointer header is difficult to the short crest voltage of Measuring Time.

(4), the price of vialog is higher.

The utility model has adopted the amplification, the holding circuit that are suitable for digital voltmeter at the problems referred to above, and its purpose is to provide a kind of reading accurate, to being quick on the draw of crest voltage, dependable performance, cheap measuring instrument.

Fig. 1, circuit structure block diagram

Fig. 2, circuit theory diagrams

, and be illustrated as embodiment of the present utility model with accompanying drawing.

The utility model is formed (Fig. 1) in order by following three parts:

1, signal input;

2, circuit;

A, first order low-pass filter;

B, amplifying circuit;

C, second level low-pass filter;

D, crest voltage are gathered retainer;

E, isolator.

3, digital voltmeter (output).

In circuit (Fig. 2),, after input signal, added by C in order to eliminate the high-frequency interferencing signal in the input signal ₁And R ₁The first order low-pass filter of forming is in order to eliminate high-frequency interferencing signal, C effectively ₁Capacity greater than 100 μ F.After this low-pass filter, IC ₁, R ₂(R _2a, R _2b), R ₃(R _3a, R _3b), R ₄, D ₁, D ₂, D ₃, W ₁And K ₁Formed the changeable fluid amplifying circuit, W ₁Be amplifier IC ₁The zeroising potentiometer, add a diode D at amplifying circuit mid point a and point between e ₂, it guarantees when crest voltage that as the voltage compensation diode voltage at some a place equates with the voltage at some b place, because amplifier IC ₂Enlargement factor be approximately 1, so the voltage at some a place equates with output voltage.K switch ₁Be used for changing amplifier IC ₁Enlargement factor.After amplifying circuit, added by R again ₄, R ₅And C ₂The second level low-pass filter of forming, it has eliminated amplifier IC ₁Output voltage in high frequency noise.D ₄And C ₃Formed crest voltage and gathered retainer, when mechanical vibration reached peak value, through the second low-pass filter filtering, amplifying circuit amplified, and remains on C at last by the crest voltage of sensor output ₃On.IC ₂Be isolator, utilize its high input impedance to eliminate measurement instrument C ₃The influence that keeps crest voltage.K ₂The reset switch that finishes for measurement.K ₃Be to adjust to measure selector switch, can adjust amplifier IC respectively with it ₁And IC ₂Zero point.

Claims

1, a kind ofly be used to measure various sensors output crest voltage measuring instruments, it is formed by connecting by sensor, circuit and output display part, and the crest voltage that it is characterized in that sensor output is through R ₁And C ₁Enter by IC after the first order low-pass filter filtering of forming ₁, R ₂, R ₃, R ₄, D ₁, D ₂, D ₃, W ₁And K ₁The changeable fluid amplifying circuit of forming is again through R ₄, R ₅And C ₂Enter D after the second level low-pass filter filtering of forming ₄And C ₄The crest voltage of forming is gathered retainer, isolator IC ₂, at last by the digital voltmeter display result.

2, crest voltage measuring instrument according to claim 1 is characterized in that in amplifying circuit, adds a diode D between some a and the some e ₂

3, crest voltage measuring instrument according to claim 1 and 2 is characterized in that C in the first order low-pass filter ₁Capacity greater than 100 μ F.