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Signal excitation device of oscilloscope probe and oscilloscope calibration system

A technology of excitation device and oscilloscope, which is applied in the direction of measuring device, instrument, digital variable display, etc., can solve the problems that affect the measurement accuracy of switching loss, the inconsistent performance of voltage probe and current probe, and the decrease of measurement accuracy, etc.

Pending Publication Date: 2021-11-02
SHENZHEN CITY SIGLENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of measuring switching power supply circuits, oscilloscopes are often used with voltage probes and current probes to measure the switching loss of switching tubes in the circuit. However, due to the inconsistency in the performance of the voltage probes and current probes, the resulting phase delay Will affect the measurement accuracy of switching loss
In the process of measuring the AC power grid, the phase delay of the voltage probe and the current probe will also affect the measurement results of active power, which will inevitably lead to the reduction of measurement accuracy.

Method used

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  • Signal excitation device of oscilloscope probe and oscilloscope calibration system
  • Signal excitation device of oscilloscope probe and oscilloscope calibration system
  • Signal excitation device of oscilloscope probe and oscilloscope calibration system

Examples

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Embodiment 1

[0032] Please refer to figure 1 In this embodiment, a signal excitation device for an oscilloscope probe is disclosed. The signal excitation device 1 mainly includes a power supply circuit 11, a drive circuit 12 and a test circuit 13, which will be described separately below.

[0033]The power supply circuit 11 is used as a DC stabilized power supply component, and is mainly used to generate a preset level of DC power for the purpose of providing the driving circuit 12 and the test circuit 13 with the required DC power.

[0034] The drive circuit 12 is connected to the power supply circuit 11, and the DC power required for operation is provided by the power supply circuit 11; and the drive circuit 12 is used as a PWM signal generation component, mainly used to generate a preset frequency and / or a preset duty cycle PWM drive Signal. It should be noted that pulse width modulation (Pulse width modulation, referred to as PWM) is an analog control method, which is to control the o...

Embodiment 2

[0056] Please refer to Image 6 , This embodiment discloses an oscilloscope calibration system, which mainly includes a signal excitation device 1, an oscilloscope 2, and a current detection probe 31 and a voltage detection probe 32 for the oscilloscope 2, which will be described respectively below.

[0057] The oscilloscope 2 includes a first signal channel CH1 , a second signal channel CH2 and a processor 21 , wherein both the first signal channel CH1 and the second signal channel CH2 are connected to the processor 21 .

[0058] Current detection probe 31 and the current test terminal of test circuit 13 in signal excitation device 1 (such as Figure 5 The sensing port T3) in the oscilloscope is connected, and the detected current signal can be transmitted to the first signal channel CH1 of the oscilloscope 2 . It can be understood that the first signal channel CH1 has a standard interface connected to the current detection probe 31, and can receive the current signal from t...

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Abstract

The invention relates to a signal excitation device of an oscilloscope probe and an oscilloscope calibration system. The signal excitation device comprises a power supply circuit, a drive circuit and a test circuit. The driving circuit is used for generating a PWM driving signal with a preset frequency and / or a preset duty ratio. The test circuit is used for generating a first calibration signal with current periodic change under the action of the PWM driving signal and outputting the first calibration signal from the current test end, and generating a second calibration signal with voltage periodic change and outputting the second calibration signal from the voltage test end. In the technical scheme, the first calibration signal and the second calibration signal generated by the signal excitation device have aligned phases, so that the two calibration signals can be used for performing zero-phase-delay effective excitation on the current detection probe and the voltage detection probe of the oscilloscope respectively; therefore, the oscilloscope can accurately measure the phase change conditions of the current signal and the voltage signal generated by the probe so as to carry out phase compensation on the phase-lagged signal.

Description

technical field [0001] The present application relates to the technical field of oscilloscopes, in particular to a signal excitation device for oscilloscope probes and an oscilloscope calibration system. Background technique [0002] Oscilloscope is an indispensable tool for designing, manufacturing and repairing electronic equipment. Today’s oscilloscopes are mostly digital oscilloscopes, which are becoming more and more popular because of their waveform triggering, storage, display, measurement, analysis and other functions. With the development of technology and market demand Rapidly developing, digital oscilloscopes are regarded as the eyes of engineers, and they will be used as a necessary tool to meet the measurement challenges of engineers. [0003] When using an oscilloscope to test and measure the circuit under test, it is also necessary to use the probe of the oscilloscope to perform the test and measurement task. The oscilloscope probe is a device that connects th...

Claims

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Application Information

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IPC IPC(8): G01R13/02G01R35/00
CPCG01R13/0218G01R13/0209G01R35/005
Inventor 曾显华谢炳涛陈永东
Owner SHENZHEN CITY SIGLENT TECH