Oscilloscope Operating Precautions

Oscilloscope Operating Precautions: In addition to the general safety precautions, the following specific precautions should be observed when operating any type of oscilloscope. Most of the Oscilloscope Operating Precautions also apply to recorders. Always study the instruction manual of any oscilloscope with which you are not familiar even if you have had considerable experience with […]

Fibre Optic CRT Recording Oscilloscope

Fibre Optic CRT Recording Oscilloscope: Fibre Optic CRT Recording Oscilloscope – The familiar CRT oscilloscope has an extremely HF response, but permanent records, normally photography of the screen, cannot be taken, since they are time limited to one sweep. By combining a special fibre optic CRT with an oscillograph type paper drive (which passes the […]

Digital Storage Oscilliscope

Digital Storage Oscilliscope(DSO): Digital Storage Oscilliscope are available in processing and non-processing types. Processing types include built in computing power, which takes advantage of the fact that all data is already in digital form. The inclusion of interfacing and a microprocessor provides a complete system for information acquisition, analysis and output. Processing capability ranges from […]

Applications of Oscilloscope

Applications of Oscilloscope: Applications of Oscilloscope – The range of applications of an oscilloscope varies from basic voltage measurements and waveform observation to highly specialised applications in all areas of science, engineering and technology. Voltage Measurements The most direct voltage measurement made with the help of an oscilloscope is the peak to peak (p—p) value. […]


Attenuators: Attenuators are designed to change the magnitude of the input signal seen at the input stage, while presenting a constant impedance on all ranges at the attenuator input. A compensated RC attenuator is required to attenuate all frequencies equally. Without this compensation, HF signal measurements would always have to take the input circuit RC […]

Probes for CRO

Probes for CRO-Direct Probes (1 : 1): Probes for CRO – The simplest types of probe (one can hardly call it a probe) is the test lead. Test leads are simply convenient lengths of wire for connecting the CRO input to the point of observation. At the CRO end, they usually terminate with lugs, banana tips […]

Oscilloscope as a Bridge Null Detector

Oscilloscope as a Bridge Null Detector: Oscilloscope as a Bridge Null Detector – As a null detector for an ac bridge, the oscilloscope, unlike a meter used for the purpose, gives separate indications for reactive and resistive balances of the bridge. Figure 7.40 shows how an oscilloscope is connected to the bridge. Here T is […]

Basic Measurement of Capacitance and Inductance

Basic Measurement of Capacitance and Inductance: Basic Measurement of Capacitance and Inductance – Capacitance may be measured from a capacitor discharge curve. This requires a dc oscilloscope with a triggered single sweep that is of the storage type. Figure 7.38 (a) shows the test setup. C is the capacitor under test, and E is 1.5 […]

Checking of Diodes

Checking of Diodes: Checking of Diodes -The voltage-current characteristics curve of a crystal diode may be observed using the circuit given in Fig. 7.37 (a). In this case the internal sweep is not used. Horizonal deflection is obtained by connecting the 6.3 V source directly to the horizontal input and switching the sweep control to […]

Gear Wheel Method

Gear Wheel Method: Gear Wheel Method – When a Lissajous figure contains a large number of loops, accurate counting becomes difficult. Figure 7.35 shows a test method that uses a modulated ring pattern in place of the looped figure and permits a higher count. This pattern is also called a Gear wheel or toothed wheel, […]

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 […]