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Read PDF Oscilloscope Measuring Technique: Principles and Applications of Modern Cathode Ray Oscilloscopes

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The required triggering is obtained from an antenna whose induced voltage is applied to the external trigger terminal. The measuring signal is transmitted to the CRO by a normal coaxial cable. The delay is obtained by an externally connected coaxial long cable to give the necessary delay.

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This arrangement is shown in Fig. The impulse generator and the time base of the CRO are triggered from an electronic tripping device.


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A first pulse from the device starts the CRO time base and after a predetermined time a second pulse triggers the impulse generator. The main function of the oscilloscope is to display voltage signals as a function of time, so that the engineer can visualize the signals and troubleshooting schemes. In this experiment, you will learn very simple operations that include displaying two waveforms, determining their amplitude, frequency, and phase. You can select two signals from the signal generator, their type, for example, sinusoidal, triangular, sawtooth and rectangular, and connect them to the two channels of the oscilloscope for display.

EO with interchangeable units are also in great demand. By changing the unit on the device, you can change its characteristics and basic operating parameters, such as:. Manufacturers of radio measuring devices produce oscilloscopes, which can be one, two or multi-path, as well as two and multichannel. Single-beam EO - unit having one input device.


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The most common are dual beam and dual channel devices. They are intended for simultaneous observation and investigation of two pulsed signals on a single CRT screen. Dual-beam oscilloscopes are convenient to use when you need to match impulse signals at the output and input, to monitor different transducers and to solve other problems.

These electronic devices have 4 operating modes:. Dual-channel and dual-beam devices have their advantages and disadvantages. The advantages of the first - the budget price and excellent specifications. The advantages of the second are in the possibility of studying two signals both separately and together.

How many rays does the oscilloscope have, it has the same number of signal inputs. The measurements made by the EA are of exceptional clarity. With their help, you can consider any electrical processes.

Electronic oscilloscopes device

The oscilloscope is a simple device with high measurement accuracy. The presence of a huge range of such measuring devices will allow you to choose the device for specific purposes. The connection of the radio measuring device to the source of the investigated signals must be made using wires and coaxial cable. To monitor continuous low and mid-frequency pulses, you should use connecting wires. In order to study pulses and high-frequency voltages, it is advisable to use high-frequency cables. To weaken the influence of the input circuit, the device is connected using a repeater.

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Catalog Record: Measuring oscilloscopes | HathiTrust Digital Library

Such a device has a high resistance, a small input capacitance, equivalent amplitude and frequency parameters, a small transmission coefficient. In cases of measuring voltage with a high-voltage pulse between the output of the signal source and the input to the meter, it is necessary to turn on the voltage divider. In order to avoid distortions in the issuance of short pulses, it is advisable to use high-frequency cables having a minimum length.

If it is necessary to obtain oscillograms with current pulses, an additional resistor with a low inductance value should be included in the circuit under study. Without it, you can not do when setting up the TV transmitter. Oscilloscopes are used to monitor and monitor periodic signals of various forms, including sinusoidal. Due to the wide sweep interval, it makes it possible to deploy the impulse even to control nanosecond time intervals. The oscilloscope is similar to the work of a TV, which depicts electrical signals. For a better understanding of the operation of the device, let us analyze the block diagram of a typical oscilloscope, since all their main types have a similar device.

This diagram does not show power supplies: a low-voltage unit that supplies power for the operation of nodes, and a source overvoltage used to generate high voltage coming on a cathode ray tube. Also, there is no calibrator on the diagram for setting up and preparing the instrument for operation. The test signal is fed to the channel of vertical deviation "Y", then to the attenuator, made in the form of a multi-position switch, which adjusts the sensitivity of the oscilloscope.

Its scale is marked in volts per centimeter or in volts per division. This means one division of the grid of coordinates on the beam tube screen. If the signal amplitude is unknown, then the least sensitivity is set.

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In this case, even a large V signal will not damage the instrument. They work just like an attenuator. These tips compensate for cable capacitance when working with small pulses. The photo shows a divider.

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The division ratio is With the help of the divider, the capabilities of the device are expanded, it is possible to investigate signals of several hundred volts. After the divider, the signal passes to preamplifier , forks and comes to sync switch and delay line which serves to compensate for the sweep generator trigger time. As a result, the pulse image is displayed on the oscilloscope display.

The sync switch operates in sync positions from:. Oscilloscopes are a common type of measuring instrument. There are several types of oscilloscopes with different characteristics, device and operation.

Such oscilloscopes are classic models of this type of measuring instrument. Any analog oscilloscopes have a divider, a vertical amplifier, synchronization and deviation, a power supply and a beam tube. Such tubes have a larger frequency range. The deflection of the beam on the screen directly depends on the voltage of the plates. Horizontal scanning works linearly with the voltage of the horizontal plates. The lower limit of the frequency is 10 hertz.

The upper limit is determined by the capacity of the plates and the amplifier. Today, analog devices are being supplanted by digital devices with their own merits. But analog devices still do not disappear due to their low cost. If you compare digital devices with analog ones, they have more options. Their cost is gradually reduced. The digital oscilloscope includes a divider, amplifier, analog signal converter, memory, control unit and display on the LCD panel. The principle of operation of this type of oscilloscopes gives them great opportunities. The incoming analog signal is digitized and stored.

How to Use an Oscilloscope

The storage speed is determined by the control device. Its upper limit is set by the speed of the converter, and the lower limit is not limited. Converting a signal into a digital code makes it possible to increase display stability, save data to memory, make stretching and scale easier. Using the display instead of the electronic tube allows you to display any data and control the device.

Expensive devices are equipped with a color screen that allows you to distinguish signals from other channels, cursors, highlight different places with color. The parameters of digital oscilloscopes are much higher than analog models, and the signal stretching is within wide limits. Synchronization can be seen immediately before turning on the sweep. Applied signal processing processors enable signal spectrum processing using Fourier transform analysis.

Information in digital form Allows you to record in memory the screen with the results of the measurement, as well as print the printer. Many devices are equipped with drives for recording images in the archive and subsequent processing. This type of oscilloscopes works on a new structure of construction based on a digital phosphor.

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