Spot Wheel Method

Spot Wheel Method: As the ratio of the two frequencies being compared increases, the Lissajous pattern becomes more complicated and hence more difficult to interpret. In such cases, it is advantageous to use the Spot Wheel Method of display as shown in Fig. 7.34 (a) whereby an intensity modulated circular or elliptical is produced on […]

Frequency Measurement by Lissajous Method

Frequency Measurement by Lissajous Method: The oscilloscope is a sensitive indicator for frequency and phase measurements. This Frequency Measurement by Lissajous Method techniques used are simple and dependable, and measurement may be made at any frequency in the response range of the oscilloscope. One of the quickest methods of determining frequency is by using Lissajous […]

Digital Readout Oscilloscope

Digital Readout Oscilloscope: The Digital Readout Oscilloscope instrument has a CRT display and a counter display. The diagram shown is of an instrument where the counter measures the time (Fig. 7.29).   The input waveform is sampled and the sampling circuit advances the sam­pling position in fixed increments, a process called strobing. The equivalent time […]

Storage Oscilloscope

Storage Oscilloscope(For VLF Signal): Storage Oscilloscope – Storage targets can be distinguished from standard phosphor targets by their ability to retain a waveform pattern for a long time, independent of phosphor peristence. Two storage techniques are used in oscilloscope CRTs, mesh stor­age and phosphor storage. A mesh-Storage Oscilloscope uses a dielectric material deposited on a […]

Sampling Oscilloscope(VHF)

Sampling Oscilloscope(VHF): An ordinary Sampling Oscilloscope has a B.W. of 10 MHz. The HF performance can be improved by means of sampling the input waveform and reconstructing its shape from the sample, i.e. the signal to be observed is sampled and after a few cycles the sampling point is advanced and another sample is taken. […]

Dual Trace Oscilloscope

Dual Trace Oscilloscope: Figure 7.19 (a) shows a block diagram of a dual trace oscilloscope. This CRO has a single electron gun whose electron beam is split into two by an electronic switch. There is one control for focus and another for intensity. Two signals are displayed simultaneously. The signals pass through identical vertical channels […]

High Frequency CRT

High Frequency CRT or Travelling Wave Type CRT: Figure 7.17 illustrates a High Frequency CRT. In an ordinary CRO, there is only one pair of VDPs. When the signal to be displayed is of a very high frequency, the electron beam does not get sufficient time to pick up the instantaneous level of the signal. […]

Typical CRT Connections

Typical CRT Connections: Figure 7.16 shows various controls and Typical CRT Connections. The following controls are available on CRO panel. Intensity It controls the magnitude of emission of the electron, beam, i.e. the electron beam is adjusted by varying the cathode-to-grid bias volt­age. This adjustment is (folk by the 500 KΩ potentiometer Focus The focusing […]

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