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Peak voltage digital display meter

A peak voltage and digital display meter technology, which is applied in the field of voltage pulse peak measurement devices, can solve the problems of low precision and small measurement range, and achieve the effects of wide application range, automation and intelligence, and high measurement accuracy

Inactive Publication Date: 2012-02-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: provide a peak voltage digital display meter, automatically select the range according to the measured peak voltage, overcome the existing peak voltage measuring instrument can only obtain measurement results within its fixed small measurement range , the disadvantages of small measurement range and low accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The measured peak voltage is between 1mv and 10mV.

[0045] Press the power switch 8, turn on the power, the 89C52 single-chip microcomputer is initialized, and the automatic range switching circuit will automatically select ①1mv~10mv in the range selection button 9, at this time, the P1.1 and P1.2 pins of the 89C52 single-chip microcomputer send a low level , X0 of CD4052 double four-choice multi-way switch I 1 is directly connected to X, P1.3 and P1.4 pins of 89C52 MCU send high level, X of CD4052 double four-choice one multi-way switch II 2 is connected to X3 , CD4052 double four selection one multi-way switch II 2 voltage divider resistor 3 and OP07 operational amplifier 4 work together to achieve 1000 times amplification of the input voltage signal, and send the amplified voltage signal to the peak voltage acquisition and hold circuit, LF398 The output voltage and input voltage of the sample-and-hold device are compared by the LM311 voltage comparator. When the inp...

Embodiment 2

[0047] The measured peak voltage is greater than 10mv to 100mV.

[0048] In addition to pressing the power switch 8 and turning on the power supply, the 89C52 single-chip microcomputer is initialized, and the automatic range switching circuit will automatically select the ②10mv~100mV in the range selection button 9. At this time, the P1. Ping, X0 and X in the control multi-way switch I 1 are directly connected, the P1.3 pin of the 89C52 microcontroller sends out a high level, and the P1.4 pin sends out a low level, and the X and X2 in the control multi-way switch II 2 are connected, The voltage dividing resistor 3 of the CD4052 double four-select one multi-way switch II 2 and the OP07 operational amplifier 4 realize the 100-fold amplification of the input voltage signal under the joint action, and other operations and measurement processes are the same as in the embodiment 1.

Embodiment 3

[0050] The measured peak voltage is between greater than 100mv and 1V.

[0051] In addition to pressing the power switch 8 and turning on the power supply, the 89C52 single-chip microcomputer initializes, and the automatic range switching circuit will automatically select ③ 100mv~1V in the range selection button 9. At this time, the P1. Ping, X0 and X in control multi-way switch I 1 are directly connected, P1.3 of 89C52 MCU sends out low level, P1.4 pin sends out high level, X and X1 in control multi-way switch II 2 are connected, CD4052 double The voltage dividing resistor 3 of the four-select-one multi-way switch II 2 and the OP07 operational amplifier 4 work together to realize the 10-fold amplification of the input voltage signal, and other operations and measurement processes are the same as those in Embodiment 1.

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Abstract

The invention discloses a peak voltage digital display meter and relates to a measuring apparatus for a voltage pulse peak value. The peak voltage digital display meter mainly consists of an automatic range switching circuit, a peak voltage collecting and retaining circuit, an A / D (Analog-to-Digital) conversion circuit and a main control circuit, wherein the automatic range switching circuit mainly consists of a CD4052 double four-in-one multi-path switch I, a CD4052 double four-in-one multi-path switch II, an OP07 operational amplifier and a divider resistor; the peak voltage collecting and retaining circuit mainly consists of an LF398 sampling holder and an LM311 voltage comparator; the A / D conversion circuit is provided with a 12-bit AD574 chip; the main control circuit comprises an input keyboard, a master processing chip and a display output module; the master processing chip is provided with an 89C52 single chip computer; and the display output module comprises a digital display circuit and a digital display tube. The measuring range of the total peak voltage of the peak voltage digital display meter is 1 mv-1000 V, and the measuring accuracy is high.

Description

technical field [0001] The technical solution of the invention relates to a measuring device for voltage pulse peak value, specifically a peak voltage digital display meter. Background technique [0002] Voltage peak is a very important electrical parameter in engineering practice, and it is also one of the safety factors that must be considered in the design and use of various electrical products. For DC voltage, the effective value, peak value, and average value are the same, and magnetoelectric instruments are usually used for measurement; for sinusoidal AC voltage, the peak value is about 1.414 times the effective value, and electromagnetic or electric instruments are usually used for measurement. After the instrument measures the effective value, calculate the peak value in proportion. However, for non-sinusoidal voltages, there is no fixed proportional relationship between the peak value and the effective value. At this time, the voltage peak value must be measured by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R15/09
Inventor 李玲玲黄晓松张云龙李凤强
Owner HEBEI UNIV OF TECH
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