The oscilloscope is an electronic measuring instrument widely used in many fields such as electronics, machinery, machine tools, electric power, ships, and petroleum. When we use the oscilloscope, we must master the three characteristics of it, so what are the three characteristics of the oscilloscope? The following small series will introduce you specifically.
Display and general appearance
The basic oscilloscope is generally divided into four parts: display, vertical control, horizontal control and trigger control. The display is usually a CRT or LCD panel, except for the screen, which is equipped with three basic controls: focus knob, intensity knob and a beam search button.
The vertical portion controls the amplitude of the displayed signal. This section performs a volt, division (volts/division) selection knob, an AC/DC/ground selection switch and a vertical (main) instrument input. In addition, this section is usually equipped with a vertical beam position knob.
Horizontally controlled time base or "scan" instrument. The main control is the second per division (SEC / DIV) selector switch. It also includes a horizontal input for drawing dual XY axis signals. The horizontal beam position knob is generally located in this section.
The trigger is controlled in the start event of the scan. The trigger can be set to automatically scan after each scan, or it can be configured to respond to an internal or external event. This section focuses on source and coupling selection switches. External trigger inputs (external inputs) and level adjustments are also included.
In addition to the basic instrument, most oscilloscopes have probes that are connected, and the probes are connected to the input of the instrument. The input impedance of the oscilloscope usually has 10 times that of a resistor. The attenuation factor is at 0.1 (-10X), but such a result helps to isolate the capacitive load from the probe cable from the measured signal. Some probes have a switch that allows the operator to bypass the resistor when appropriate.
Size and portability
Most modern oscilloscopes are lightweight and portable. In addition to portable devices, the market offers a large number of micro-battery powered instruments for field service applications. Laboratory-grade oscilloscopes, especially older units, use vacuum tubes, which are general desktop devices or can be mounted to dedicated carts. The dedicated oscilloscope is rack mounted or permanently mounted in a custom instrument housing.
Input
The signal to be measured is fed to an input connector, which is a conventional coaxial connector such as the BNC or UHF type. Terminal or banana plug for low frequency. If the signal source has its own coaxial connector, then use a simple coaxial cable. Otherwise, there is a special cable called an "oscilloscope probe". In general, one for connecting to the observed point. The open wire test leads are unsatisfactory and probes are generally necessary. General-purpose oscilloscopes typically exhibit a small but known capacitance of 20 Ω for parallel input impedance of 1 megohm. This allows the use of standard oscilloscope probes. The very high frequency of use of the scope may have a 50 ohm input and must be connected directly to a 50 ohm source or using a Z0 or active probe.
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