1

00:00:00,666 --> 00:00:06,533

Hello everyone, today we will learn how to use the single trigger function of the oscilloscope to capture waveforms

2

00:00:09,400 --> 00:00:15,600

First, we turn on the oscilloscope, and quickly set up the oscilloscope according to the method we learned earlier

3

00:00:17,300 --> 00:00:20,000

We check whether the ratio of the probe is 10,

4

00:00:20,533 --> 00:00:23,833

and whether the real object is consistent with the setting

5

00:00:24,066 --> 00:00:26,166

Then set the menu of channel 1

6

00:00:26,533 --> 00:00:30,400

Set Coupling to DC, turn the Bandwidth Limit off,

7

00:00:31,466 --> 00:00:33,133

turn the range to Coarse

8

00:00:33,833 --> 00:00:36,800

Probe attenuation ratio adjustment is set to 10,

9

00:00:37,233 --> 00:00:38,933

reverse phase is off

10

00:00:39,900 --> 00:00:43,833

Then the cross on the screen is the horizontal position and vertical position

11

00:00:46,300 --> 00:00:50,600

This is the vertical position, the arrow above is the horizontal position

12

00:00:57,066 --> 00:00:59,533

The fourth step, set the trigger menu

13

00:01:00,433 --> 00:01:02,500

Trigger mode is set to edge trigger

14

00:01:05,766 --> 00:01:08,466

Source selection, we choose channel 1

15

00:01:10,000 --> 00:01:14,966

We can set the slope as rising edge or falling edge according to the measured waveform

16

00:01:17,466 --> 00:01:19,800

Trigger mode can choose single trigger

17

00:01:22,633 --> 00:01:28,266

Then set the volts/ grid, time base, trigger level, trigger channel, etc.

18

00:01:34,833 --> 00:01:38,566

After all these are set, do not power on the mainboard

19

00:01:41,900 --> 00:01:45,500

To use the single-shot trigger function of the oscilloscope correctly,

20

00:01:46,033 --> 00:01:50,166

the first step is to disconnect the power supply of the mainboard and ground the probe clip

21

00:01:57,466 --> 00:02:00,800

The second step is to place the probe on the point to be measured

22

00:02:01,733 --> 00:02:06,900

The third step is to power on the mainboard and observe the changes of the waveform on the screen

23

00:02:12,100 --> 00:02:16,533

For example, for this waveform, its power supply will drop in an instant,

24

00:02:19,500 --> 00:02:22,866

and the whole process takes about 700 microseconds

25

00:02:23,900 --> 00:02:25,800

It cannot be measured with a multimeter,

26

00:02:28,400 --> 00:02:31,366

the response speed of the multimeter is not so fast

27

00:02:33,300 --> 00:02:35,133

When a power supply has no output,

28

00:02:35,200 --> 00:02:40,466

use the single trigger function of the oscilloscope to capture the waveform at the back end of the inductor

29

00:02:41,333 --> 00:02:44,800

Through this waveform, the fault can be accurately judged

30

00:02:45,200 --> 00:02:50,300

For example, this is due to poor filtering leading to overvoltage protection

31

00:02:50,866 --> 00:02:54,100

This is the one-shot trigger function of the oscilloscope