Basic Controls of a CRO

jojo September 24, 2009 10 Comments
Number of controls are required to be provided on a panel of CRO to facilitate its proper functioning. Intensity control is provided for adjustment of brightness of the spot on the screen. It is accomplished by varying the voltage...
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CRT-Cathode Ray Tube

jojo September 24, 2009 5 Comments
Cathode ray tube essentially consists of an electron gun for producing a stream of electrons, focusing and accelerating anodes for producing a narrow and sharply focused electron beam, horizontal and vertical deflection plates for controlling the beam path and...
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jojo September 23, 2009 9 Comments
Q-Meter We know that every inductor coil has a certain amount of resistance and the coil should have lowest possible resistance. The ratio of the inductive reactance to the effective resistance of the coil is called the quality factor  ...
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Electronic Multimeters

jojo September 23, 2009 4 Comments
Electronic Multimeters It is one of the most versatile general purpose instruments capable of measuring dc and ac voltages as well as current and resistances. The solid-state electronic multimeter (or VOM) generally consists of the following elements. A balanced...
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jojo January 18, 2011 9 Comments
Electronic Galvanometers A vacuum tube or transistor amplifier, followed by a milli-ammeter may be employed as a detector. Some of such devices have arbitrary scale values, sometimes with variable gain, and are designed simply as balance indicators. The sensitivity may...
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Balanced Bridge Voltmeters

jojo September 23, 2009 No Comments
Balanced Bridge Voltmeters Such voltmeters can be used for measurement of both dc and ac voltages and are very popular. These voltmeters are available in both versions, vacuum tube type and transistorized type and are described below: (a) Balanced...
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RMS Reading Voltmeter

jojo September 23, 2009 1 Comment
True RMS Reading Voltmeter RMS value of the sinusoidal waveform is meas­ured by the average reading voltmeter of which scale is calibrated in terms of rms value. This method is quite simple and less expensive. But sometimes rms value...
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AC Voltmeters

jojo September 23, 2009 8 Comments
In electronic ac voltme­ters input signal is firstly rectified and then sup­plied to the dc amplifier, as shown in figure. Sometimes signal is firstly amplified by ac amplifier and then recti­fied before supplying it to dc meter, as shown in...
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DC Voltmeters

jojo August 13, 2017 2 Comments
DC Voltmeter Block Diagram DC voltmeter mainly consists of a dc ampli­fier apart from the attenuator, as shown in figure.   DC voltmeters can further be divided into two categories. 1. Direct Coupled Amplifier DC Voltmeter This type of...
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