TIPS on Using Oscilloscope

- Jun 12, 2018 -

TIPS on Using Oscilloscope

An oscilloscope is a widely used electronic measuring instrument. It can convert electric signals that are invisible to the naked eye into visible images, making it easier for people to study the changing process of various electrical phenomena. The oscilloscope uses a narrow electron beam consisting of high-speed electrons to create a tiny spot on a screen coated with a fluorescent substance. Under the action of the signal under test, the electron beam is like a pen tip, which can depict the curve of the instantaneous value of the signal under test on the screen. Using an oscilloscope, you can observe waveforms of various signal amplitudes over time. You can also use it to test various power levels, such as voltage, current, frequency, phase difference, amplitude, and so on.

(1) The general oscilloscope adjusts the brightness and focus knob to minimize the spot diameter to make the waveform clear and reduce the test error; do not make the light spot stay a bit fixed, otherwise the electron beam bombardment should form a dark spot on the fluorescent screen, damage Fluorescent screen.

(2) Measurement systems, such as oscilloscopes, signal sources, printers, computers, etc.; the ground wire of the tested electronic equipment, such as instruments, electronic components, circuit boards, and the power supply of the device under test, must be connected to the public ground (ground). .

(3) The casing of the general oscilloscope, the metal outer ring of the signal input end BNC socket, the probe grounding wire, and the grounding wire end of the AC220V power outlet are all connected. If the instrument is not connected to a ground wire and the probe is used to measure the floating signal directly, the instrument will generate a potential difference with respect to the ground; the voltage value is equal to the potential difference between the ground wire of the probe and the point of the device under test and the earth. This will pose serious safety hazards to the instrument operator, the oscilloscope, and the electronic device under test.

(4) If the user needs to measure the switching power supply (switching power supply primary, control circuit), UPS (uninterruptible power supply), electronic rectifiers, energy saving lamps, inverters and other types of products or other electronic equipment that can not be isolated from the mains AC220V floating ground For signal testing, DP100 high voltage isolated differential probes must be used.

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