How to properly use an oscilloscope to measure ripple in a junior engineer

This section describes how to measure voltage, time, phase, and frequency using an oscilloscope.

1. Measurement of voltage:

Any measurement made with an oscilloscope boils down to a measurement of voltage. The oscilloscope can measure the voltage amplitude of various waveforms, both DC and sinusoidal, as well as the amplitude of pulse impulse or non-sinusoidal voltage. Even more useful is that it can measure the voltage amplitude of each part of an impulse voltage waveform.

2. Measurement of time:

The oscilloscope time base can produce a scan line that is linear with time, so the horizontal scale of the phosphor screen can be used to measure the time parameters of the waveform, such as the repetition period of the periodic signal, the width of the pulse signal, the time interval, the rise time (leading edge) and fall time (trailing edge), the time difference between the two signals, and so on.

3. Phase measurement:

It is useful to use an oscilloscope to measure the phase difference between two sinusoidal voltages, and counters can be used to measure frequency and time, but not directly to measure the phase relationship between sinusoidal voltages.

4. Frequency measurement:

Signal frequencies can be measured with an oscilloscope using the periodic method. For any periodic signal, the time t of each cycle can be determined by the measurement method of the time interval described above, and then the frequency f is found by the following formula: f=1 t

If the voltage is relatively large, or the bandwidth requirements are relatively high, x10 can be used, and x1 can be used under normal circumstances to avoid unnecessary noise attenuation affecting the measurement of ripple. At the same time, the attenuation ratio of the oscilloscope channel should also be adjusted to x1.

Power supply ripple is the most intuitive performance of power supply, DC regulated power supply is generally formed by AC power supply through rectifier and voltage stabilization, etc., inevitably in the DC voltage regulation with some AC components, this superimposed on the DC voltage regulator AC component is called ripple.

It should be noted that the ground wire (wire with alligator clip) on the probe should not be connected to the "-" end or "ground" of the power supply, as this will couple external interference to the inside of the oscilloscope, resulting in inaccurate measurement results. It is best to connect the "-" end of the power supply or "ground" with the ground spring of the probe attachment.

When the DC is shielded, VPP is the value of the ripple.

An oscilloscope is a commonly used electronic test instrument used to measure the morphology, frequency, amplitude and other characteristics of leakage and delay signals. There are three measurement methods for oscilloscopes: sine wave measurement, square wave measurement, and pulse measurement.

Sine wave measurement refers to a measurement method that displays a sine waveform on an oscilloscope. When measuring a sine wave, the oscilloscope measures its frequency, amplitude, phase, and other characteristics. This measurement method is suitable for sine waves with stable frequency and low amplitude.

Square wave measurement refers to the measurement method of displaying a square waveform on this oscillator. When measuring a square wave, the oscilloscope measures its duty cycle, rise time, fall time, etc. This measurement method is suitable for square wave signals and other signals similar to square waves.

Pulse measurement refers to a measurement method that displays a pulse waveform on an oscilloscope. When measuring a pulse, the oscilloscope measures its width, rise time, fall time, peak value, and other characteristics. This measurement method is suitable for pulsed signals and other pulse-like signals.

Summary. The oscilloscope is an electronic measuring instrument, mainly for the detection of various electrical signals, with accurate measurement, easy maintenance, flexible use, high reliability, good stability and other advantages, is widely used in many industries. When we use the oscilloscope, we need to master the measurement method of the oscilloscope, which is very important for the user's use.

Today, I will introduce to you the measurement method of the oscilloscope, I hope it can help you.

1.A method for measuring amplitude and frequency (using the calibration signal of an oscilloscope as an example).

1) Insert the oscilloscope probe into the channel 1 jack and set the attenuation on the probe"1"File;

2) Set the channel selection to CH1 and the coupling mode to the DC file;

3) Insert the probe probe into the small hole of the calibration signal source, and the light trace appears on the oscilloscope screen at this time;

4) Adjust the vertical knob and horizontal knob to stabilize the waveform displayed on the screen, and put the vertical and horizontal trim in the calibration position;

5) Read out the number of grids occupied by the waveform in the vertical direction, multiply it by the indicated value of the vertical attenuation knob, and obtain the amplitude of the calibration signal;

6) Read out the number of cells occupied by the waveform in the horizontal direction for each cycle, multiplied by the indication of the horizontal sweep knob.

What is the waveform measurement and reading method of the oscilloscope?

The oscilloscope is an electronic measuring instrument, mainly for the detection of various electrical signals, with accurate measurement, easy maintenance, flexible use, high reliability, good stability and other advantages, is widely used in many industries. When we use the oscilloscope, we need to master the measurement method of the oscilloscope, which is very important for the user's use. Today, I will introduce to you the measurement method of the oscilloscope, I hope it can help you.

1.Method for measuring amplitude and frequency (using the calibration signal of an oscilloscope as an example) (1) Insert the oscilloscope probe into the channel 1 jack and set the attenuation on the probe on"1"File; 2) Set the channel selection to CH1 and the coupling mode to the DC file; 3) Insert the probe probe into the small hole of the calibration signal source, and the light trace appears on the oscilloscope screen at this time; 4) Adjust the vertical knob and horizontal knob to stabilize the waveform displayed on the screen, and put the vertical and horizontal trim in the calibration position; 5) Read out the number of grids occupied by the waveform in the vertical direction, multiply it by the indicated value of the vertical attenuation knob, and obtain the amplitude of the calibration signal; 6) Read out the number of cells occupied by the waveform in the horizontal direction for each cycle, multiplied by the indication of the horizontal sweep knob.

Thank you. than the heart].

The Xu Pingsheng oscilloscope of Soochow University is a commonly used measuring instrument that can measure all the parameters that characterize the characteristics of electrical signals, such as voltage, return current, time, frequency, and phase difference. In the electronic circuit experiment, it is often found that some students can not master the measurement method correctly and proficiently, which affects the accuracy of the experimental data, so the basic measurement method of the oscilloscope is briefly introduced. The most commonly used method for measuring voltage is the direct measurement method, which measures the height of the measured voltage waveform displayed on the phosphor screen ( and then converts it into a voltage value according to the oscilloscope's axis deflection sensitivity.

When measuring, the calibration signal inside the oscilloscope is used for calibration, and then the measurement is taken. The voltage of the measured signal is input from the input terminal of the oscilloscope, and the relevant switches and knobs on the oscilloscope panel are adjusted to display a stable waveform on the phosphor screen, and the height between the peaks is read ( Write down the level of the oscilloscope sensitivity selection switch ( The peak-to-peak value of the measured voltage can be calculated by the following formula.

If the voltage to be measured is measured with a probe of : multiply the attenuation rate of the probe. For example, the sensitivity switch is placed at the gear level, and the axis deflection height between the peaks of the measured voltage waveform on the phosphor screen occupies the axis coordinate scale, that is, the measured signal voltage is

Measure the waveform with an oscilloscope by:

1. First, insert the oscilloscope probe into the channel 1 jack, and set the attenuation on the probe to 1 gear.

2. Then put the channel selection to CH1 and the coupling mode to the DC file.

3. Then insert the probe probe into the small hole of the calibration signal source, and the light trace appears on the oscilloscope screen.

4) Adjust the vertical knob and horizontal knob to stabilize the waveform displayed on the screen, and put the vertical and horizontal trim in the calibration position;

5. Read out the number of grids occupied by the waveform in the vertical direction, multiply it by the indicated value of the vertical attenuation knob, and obtain the amplitude of the calibrated ridge disturbance signal.

6. Read out the number of cells occupied by each cycle of the waveform in the horizontal direction, multiply it by the indicated value of the horizontal scanning knob to obtain the period of the calibration signal (the reciprocal of the period is the frequency).

7. The frequency of the general calibration signal is 1kHz, and the amplitude of the cherry blossom kernel is used to calibrate the frequency of the oscilloscope's internal scanning oscilloscope.