The objective of observing a signal on the oscilloscope screen is to make voltage and time measurements. Multiple channels are displayed using either an alternate or chop mode.Ĭhop mode causes the oscilloscope to draw small parts of each signal back and forth between them, the switching rate is too fast so that the waveform looks like a continuous signal. It is usually used to measure phase difference between two signals. T he oscilloscope has a capability to display both channel signals on the screen at the same time. When the input coupling is the connection from circuit to the oscilloscope. It also allows automatic (auto) triggering of allows sweep to run free (free run).Ĭoupling is used to connect an electrical signal from one circuit to another. Level: Selects the voltage point on the triggering signal at which sweep is triggered. Slope: Selects whether triggering occurs on a rising or falling edge of trigger signal.Ĭoupling: Selects whether triggering occurs at a specific amount of DC or AC level. The trigger selects the timing of the beginning of the horizontal sweep. Horizontal Variable: Controls the attenuation (reduction) of signal applied to horizontal amplifier through External Horizontal connector. Sweep time/cm Variable: Provides continuously variable sweep rates. Sweep time/cm: For selecting desired sweep rate from calibrated steps or admits external signal to horizontal amplifier. Horizontal controls are used to position and scale the wave form horizontally. Vertical Position knob: To move the trace up or down the on the screen. Position: Controls horizontal position of trace on screen. Variable: Provides continuously variable voltage sensitivity. : For selecting desired voltage sensitivity of the vertical amplifier to obtain the proper wave form on the screen. Vertical controls are used to position and scale the wave form vertically. The standard calibration signal is 0V-2V at 1KHz. It allows the accurate scaling of the trace. It gives a steady square wave at a particular set frequency and voltage. As the sweep speed is increased, there is a need to increase the intensity level.Ī focus control is used to adjust the sharpness of the waveform.Ī trace control is used to rotate the trace on the CRO screen.Ī calibration point is used to calibrate the CRO. The front panel of cathode ray oscilloscope comprises of many measurement knob by which an experimenter can shift the wave form according to need of measuring parameter.Īn intensity control is used to adjust the brightness of the waveform. The amplitude and frequency of the signal displayed on the screen depends on the voltages on vertical and horizontal deflection plates respectively. The emitted electrons is then accelerated towards the screen and strikes on the fluorescent screen, due to its fluorescent properties it glow s when electron strikes on it. The positive low voltage supply is from + 300 to 400 V and t he negative high voltage supply is from -1000 to -1500 V.ĭ epicting the cathode ray tube which emits electrons from the ( filament ) cathode. There are two power supplies, a negative High Voltage (HV) supply which is required for filament and a positive Low Voltage (LV) supply for other circuitry then filament. In this phenomenon the charge particle are emitted by the filament when it is heated by supplying a high negative voltage. It is also known as thermal electron emission. part of his work on high frequency alternating currents. Karl Braun demonstrated the model of first oscilloscope in 1897, while working on the high frequency AC current. Karl Braun used the cathode ray tube as an electron gun with a fluorescent screen which emit flash of light which electronic strike on it and built the first oscilloscope called Braun’s electro meter. He worked as assistant Professor at Wurzburg University. In this graduated the topic of his research is the oscillations of elastic strings. Karl Ferdinand Braun born on June 6 1 850, he educated at the local “Gymnasium”. It comprises of a cathode-ray tube (CRT), and input circuitry for focusing and amplification. It can measure various quantities such as peak voltage, frequency, phase difference, pulse-width, delay time, rise time, and fall time. Shaheed Rajguru College of Applied Sciences for Women, University of Delhi.ĬRO is a basic instrument employed for the study of several types of waveforms. Project Investigators: Dr Sneha Kabra, Dr Amita Kapoor, Ms Himani Dua, Mridula Gupta, Department of Electronics, South campus. Development of e-resource on standard procedure of operation and applications of important Electronic devices used by undergraduate science students.
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