Measuring instrument, method for measuring currents and method for measuring mobile phone charging currents

Abstract

The invention relates to a measuring instrument, a method for measuring currents and a method for measuring mobile phone charging currents. The measuring instrument comprises a voltage measuring channel and a resistor, wherein the voltage measuring channel is provided with a connecting end, the resistor is parallelly connected with the voltage measuring channel by connecting with the connecting end, and the resistor is used for being serially connected into a to-be-measured current path. The measuring instrument has the advantages that currents can be measured by parallelly connecting the resistor with the voltage measuring channel, impedance is lowered, and the voltage measuring channel of the measuring instrument is utilized effectively.

Description

technical field [0001] The invention relates to the field of measuring instruments, in particular to a measuring instrument, a method for measuring current, and a method for measuring the charging current of a mobile phone. Background technique [0002] Nowadays, the current value of mobile phone charging can reach 2A to 5A, or even higher than this, but the range of the current path of the measuring instrument on the market cannot match the current value, and the number of current paths is small. If you need to sample The current of multiple mobile phones requires multiple modules. Using voltage and current files to measure voltage and current respectively cannot meet the demand. For example, the number of current paths of a common measuring instrument is 2, and the range is: 10nA to 1A. [0003] When a high-precision multimeter is directly used to collect a small current with a resolution of mA level, the internal resistance will seriously affect the accuracy of the charg...

AI Technical Summary

Problems solved by technology

[0002] Nowadays, the current value of mobile phone charging can reach 2A to 5A, or even higher than this, but the range of the current path of the measuring instrument on the market cannot match the current value, and the number of current paths is small. If you need to sample The current of multiple mobile phones requires multiple modules. Using voltage and current files to measure voltage and current respectively cannot meet the demand. For example, the number of current paths of a common measuring instrument is 2, and the range is: 10nA to 1A

[0003] When a high-precision multimeter is directly used to collect a small current with mA-level resolution, the internal resistance will seriously affect the accuracy of the charging curve of the mobile phone, resulting in low production efficiency, and the multi-channel high-precision current curve data cannot be collected and recorded at the same time.

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