What should I be aware of when using an oscilloscope?
(1) dust, humidity, do not use a cover cloth, long-term use, should be frequently powered (generally more than 20 min) baking heat.
(2) The measured signal should be warmed up before input.
(3) Waveform brightness should be moderate, the point of light should not stay at a point for a long time.
(4) If a dual-trace oscilloscope is used, the two signals under test should be connected to a common ground.
(5) Oscilloscopes and the circuit of the signal under test between the line should not be too long.
How to measure the period or frequency of AC voltage with an oscilloscope?
First of all, do the preparatory work before measurement (such as oscilloscope warm-up, the switch to the appropriate position), and then the input signal through the probe to the input, adjust the waveform to the appropriate position, the reading is.
T = t / grid × grid
Where: T - the period of the AC voltage signal.
t / frame - oscilloscope screen in the horizontal direction of the time indicated by each frame.
For example, t/g = 1 us, the number of frames is 10, then T = 10 us. its frequency f = 1/T = 105Hz.
How to use an oscilloscope to measure differential signals?
The best way is to use a differential probe, then the measured signal is the most real and objective; if there is no differential probe, you can use two probes connected to the oscilloscope's two channels (e.g., CH1, CH2), and then mathematical calculations, to get the CH1-CH2 waveforms and analyse them, and try to keep the two probes exactly the same, oscilloscope the two channels of the Vertical scale (per cell) set the same. Vertical scale (how many volts per frame) of the two channels of the oscilloscope are set the same, otherwise, the error will be larger.
