Now, the many of you must be wondering ‘what is triggering?’, it is the synchronization of the horizontal sweep of the CRO with the proper point of the signal. +/- : This determines if the signal is triggered during the positive flank or the negative flank. 4: Image showing Intensity and Focus Buttons of CRO This knob is marked as ‘Intens’ on the CRO.įig. There is a common misconception regarding this knob to be a brightness control feature but it is not so, this increases the number of electrons in the beam so that more and more electrons collide the phosphorus screen for better view of the applied input signal. Intensity: This knob is used to increase the intensity of the input signal for better examination of the displayed output on the screen. Thus, it helps in taking the proper measurements and to study the correct shape of the signal by removing the blurriness of the signal. GD (Ground): If the switch is at the GD position then the input signal is shorted and thus a horizontal line is seen in the display symbolizing no potential difference between ground and input signal.įocus: This rotating knob is used to improve the sharpness of an image of the signal on the screen by adjusting the focus of the electronic beam.DC (Direct Current Coupling): If the switch is at DC position then the signal will not go through a RC-filter and the DC components will persist in the signal. ![]() AC (Alternating Current Coupling): If the switch is at AC then the signal will go through a RC-filter to remove its DC components.3: Image showing Trigger Hold-Off Button of CROĪC/DC/GD: This is a toggle switch to tell the CRO about the filtering of the i/p signal channel. Initially it is set to zero, but to avoid the certain peaks and noises in the signal the sweep time can be increased to obtain a stable signal at the display.įig. ![]() Hold-Off determines the time that tends to pass between ‘retrace’ and ‘sweep’. This process is called ‘retrace’, when the retrace is completed again sweep starts. When the ‘sweep’ is completed the voltage returns to its original value and thus forcing the beam of electrons to move back. Trigger Hold-Off: The trace in a CRO is performed by the sweeping of electrons for a small period of time on the phosphorous screen by the voltage generated due to the signal. 2: Image showing Channel Select Buttons of CRO If both the channels are used the selection should be ‘Dual’ and if only one channel is used it should be either ‘channel 1’ or ‘channel 2’ depending on the connection.įig. 1: Image showing On/Off Button of CROĬhannel Select: As we know most of the CRO can work simultaneously with two signals and thus there is a toggle switch present in the controls regarding the selection, i.e., if both the channels are used or only one is used. On/Off: This is required to turn the CRO on or off as per the requirement.įig. Now since you have been acquainted with the primary knobs of a Cathode Ray Oscilloscope it’s time to dive deeper and to know more about the other knobs which are helpful in further observation of a signal. This experiment familarises students with all the tools of the oscilloscope and how changes in waveforms can be seen and measured using the oscilloscope.In the last tutorial on CRO I gave you a detailed idea about the various components of an Oscilloscope concerned with the positioning and magnification of an input signal and the role of probes was also explained. The resiatnce of the decae box can also be changed and the wwaveform analysed using the oscilloscope. One decade box is always included in the system but the second decade box, the capacitor and the coil are swopped out and changes in the waveform analysed. There are also two decade boxes (a unit containing resistors of many values, with one or more mechanical switches which allow any one of various discrete resistances offered by the box to be dialed in), a capacitor and a wire coil. A power supply that puts out an AC signal which has a sine wave waveform. In this experiment multiple electrical circuit components are used. Being able to use an oscilloscope is avaluable skill for any person learning about electrical circuits. It is like plotting a graph of an electrical signal. It is a very fast X-Y plotter shows the input signal versus another signal or versus time. ![]() The cathode ray oscilloscope (CRO) is a type of electrical instrument which is used for showing the measurement and analysis of waveforms. Centre for Continuing Professional Development.Sustainable Development Goals in UCC Research.
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