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Direct current voltmeter and method for measuring voltage by using same

A technology of DC voltmeter and measurement point, which is applied in the direction of measurement using digital measurement technology, which can solve problems such as current consumption and measurement error, and achieve the effect of accurate voltage value

Active Publication Date: 2013-10-02
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the internal resistance of the meter needs to consume current, resulting in wrong measurement results

Method used

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  • Direct current voltmeter and method for measuring voltage by using same
  • Direct current voltmeter and method for measuring voltage by using same

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and embodiment, further elaborate the present invention.

[0018] Such as figure 2 As shown, a DC voltmeter includes a casing, and the casing is provided with a first signal input terminal 100 and a second signal input terminal 101 for connecting with a measuring point of the circuit to be measured, the first signal input terminal 100 and the second signal input terminal 100 The signal input terminal 101 can be connected with a measuring test lead or a measuring wire clamp. A main controller MCU is arranged inside the casing, and the MCU is electrically connected with a program-controlled voltage source module and a current detection module A. Two output terminals of the programmable voltage source module are electrically connected to the first signal input terminal 100 and the second signal input terminal 101 respectively. The current detection module A is connected in series with a resistor R, and the current detection...

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Abstract

The invention discloses a direct current voltmeter and a method for measuring voltage by using the same, and relates to the technical field of electric quantity measuring instruments. The direct current voltmeter comprises an MCU (micro controller unit) as a main controller, and further comprises a program-controlled voltage source module and a current detection module which are in signal transmission with the MCU respectively, wherein the MCU controls the program-controlled voltage source module to output a varying voltage signal according to a signal transmitted from the current detection module; the voltage signal is gradually enhanced, and during voltage measurement, the internal resistance of the direct current voltmeter can be equivalent to infinity. The direct current voltmeter solves the technical problem that the conventional electric quantity measuring instrument cannot measure current and voltage accurately in the prior art; during the voltage measurement, the direct current voltmeter does not affect a to-be-measured circuit and can accurately measure the voltage of the to-be-measured circuit.

Description

technical field [0001] The invention relates to the technical field of electricity measuring instruments, in particular to a DC voltmeter and a voltage measurement method using the voltmeter. Background technique [0002] Power measurement includes the measurement of current, voltage, power and electric energy, among which voltage is the most basic power in electrician measurement. At present, when measuring voltage, a voltmeter or a multimeter is generally used for measurement. [0003] When the existing equipment measures the voltage between two points in the circuit, the instrument needs to be connected in parallel between the two points. Since the internal resistance of the instrument is not infinite, this is equivalent to connecting a finite resistance in parallel between the two measurement points. This resistance also consumes the current of the circuit to be measured. Although this current is very small, it generally does not affect the accuracy of the measurement....

Claims

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Application Information

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IPC IPC(8): G01R19/25
Inventor 张召德
Owner QINGDAO GOERTEK
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