An oscilloscope is a very widely used electronic measuring instrument. It can transform electrical signals that are invisible to the naked eye into visible images, which is convenient for people to study the changing process of various electrical phenomena. The oscilloscope uses a narrow electron beam composed of high-speed electrons to hit a screen coated with a fluorescent substance to produce a small light spot. Under the effect of the measured signal, the electron beam is like the tip of a pen, and the curve of the instantaneous value of the measured signal can be drawn on the screen. Using an oscilloscope, you can observe the waveform curves of various signal amplitudes changing with time, and you can also use it to test various electrical quantities, such as voltage, current, frequency, phase difference, and amplitude adjustment. The following is a brief introduction to the tips for using the oscilloscope:
1. The general oscilloscope adjusts the brightness and focus knob to minimize the diameter of the light spot to make the waveform clear and reduce the test error; do not leave the light spot at a fixed position, otherwise the electron beam bombards a spot to form a dark spot on the fluorescent screen and damage the fluorescent screen .
2. Measuring system-such as oscilloscope, signal source; printer, computer and other equipment. The grounding wire of the electronic equipment under test-such as instruments, electronic components, circuit boards, and power supply of the equipment under test must be connected to the common ground (earth).
3. When the TDS200 / TDS1000 / TDS2000 series digital oscilloscope is used with a probe, it can only measure the waveform of the signal (the measured signal-signal ground is the ground, and the output amplitude of the signal terminal is less than 300VCATII). Never measure the floating signal of the AC220V or electronic equipment that cannot be isolated from the AC220V. (The floating floor can not be connected to the earth, otherwise it will cause damage to the instrument, such as testing the electromagnetic oven.)
4. The shell of the universal oscilloscope, the metal outer ring of the signal input terminal BNC socket, the ground wire of the probe, and the ground wire end of the AC220V power socket are all connected. If the instrument is not connected to the earth wire, and the probe is used to measure the floating signal directly, the instrument will generate a potential difference relative to the earth; the voltage value is equal to the potential difference between the point where the probe ground wire contacts the device under test and the earth. This will bring serious safety hazards to instrument operators, oscilloscopes, and electronic equipment under test.
5. If the user needs to measure the switching power supply (switching power supply primary, control circuit), UPS (uninterruptible power supply), electronic rectifier, energy-saving lamp, frequency converter and other types of products or other electronic equipment that can not be isolated from the commercial AC220V to carry a floating signal When testing, you must use the DP100 high-voltage isolated differential probe.
Other matters needing attention in the use of oscilloscope:
(1) Thermal electronic instruments generally avoid frequent power-on and power-off, as do oscilloscopes. (2) If you find that the waveform is disturbed by the outside world, you can ground the oscilloscope case.
(3) The voltage of "Y input" should not be too high, so as not to damage the instrument, and it should not exceed 400V at the maximum attenuation. When the "Y input" wire is suspended, interference waveforms appear due to external electromagnetic interference, and this phenomenon should be avoided.
(4) Before turning off, turn the brightness adjustment knob to the bottom in a counterclockwise direction to minimize the brightness, and then turn off the power switch. Analog oscilloscope
(5) When observing and adjusting the bright spots on the screen, the brightness of the bright spots should be moderate and not too bright.
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