Introduction to the use of oscilloscopes
There are many types and models of oscilloscopes with different functions. The most commonly used oscilloscopes for digital circuit experiments are 20MHz or 40MHz dual-trace oscilloscopes. The usage of these oscilloscopes is similar. This section does not focus on a particular type of oscilloscope, but only conceptually introduces the commonly used functions of oscilloscopes in digital circuit experiments.
1. Fluorescent Screen
The fluorescent screen is the display part of the oscilloscope. The horizontal and vertical directions of the screen each have multiple scale lines, indicating the relationship between the voltage and time of the signal waveform. The horizontal direction indicates the time, and the vertical direction indicates the voltage. The horizontal direction is divided into 10 frames and the vertical direction is divided into 8 frames, and each frame is divided into 5 sections. The vertical direction is marked with 0%, 10%, 90%, 100%, etc., and the horizontal direction is marked with 10%, 90% for measuring DC level, AC signal amplitude, delay time and other parameters. According to the measured signal on the screen accounted for the number of frames multiplied by the appropriate proportionality constants (V / DIV, TIME / DIV) can be derived from the voltage value and time value.
2, oscilloscope and power system
(1) Power supply (Power)
Oscilloscope main power switch. When this switch is pressed, the power indicator lights up, indicating that the power supply is on.
(2) Glow (Intensity)
Rotate this knob to change the brightness of the light spot and scan line. Observe the low-frequency signals can be smaller, high-frequency signals larger. Generally should not be too bright to protect the fluorescent screen.
(3) Focus
Focus knob to adjust the size of the electron beam cross-section, the scanning line will be focused into the clearest state.
(4) scale brightness (Illuminance)
This knob adjusts the brightness of the illuminator behind the fluorescent screen. Normal indoor light, the illumination darker good. Indoor light in the environment of low light, can be appropriate to brighten the illumination lamp.
