Electronic Instrumentation

CCIF Intermodulation Distortion: In the second method of carrying out an CCIF Intermodulation Distortion test, the two test signals used have equal amplitude, and relatively high but slightly different frequencies. When non-linear distortion is present, a difference frequency component appears in the output and is used as a measure of the amount of distortion present. […]

Nonlinear Distortion Measurements: One of the methods of Nonlinear Distortion Measurements consists of simulta­neously applying two sinusoidal voltages of different frequencies to the amplifier input and observing the sum, difference and various combination frequencies that are produced by the non-linearity of the amplifier. This method of Nonlinear Distortion Measurements is called the intermodulation method. The

Selectivity Measurement Receiver: The Selectivity Measurement Receiver is its ability to reject, (adjacent) unwanted signals. It is expressed as a curve, such as the one in Fig. 16.5, which shows the attenuation that the receiver offers to signals at frequencies near the one to which it is tuned. Selectivity is measured at the end of

Sensitivity Measurement Definition: The Sensitivity Measurement Definition of a radio receiver is its ability to amplify weak signals. It is often defined in terms of the voltage that must be applied to the receiver input terminals to give a standard output power, measured at the output terminals. For AM broadcast receivers, many of the relevant

RF UHF field strength meter circuit: There are two general methods available for determination of RF UHF field strength meter circuit. One is the standard antenna method. In this, use is made of an antenna in which the relationship between the field strength of the radio wave and the equivalent voltage that the wave induces

Simple Cylindrical Cavity Wavemeter: Resonant cavities find extensive use as wavemeter at microwave frequencies. They enjoy high accuracy, mechanical simplicity, and a large physical size in proportion to the wavelength being measured. Practical cavity wavemeter are always in the form of cylinders which are tunable by means of a piston that varies the length of

Resonant Coaxial Wavemeter: A Resonant Coaxial Wavemeter line such as illustrated in Fig. 16.1 and operating as a resonant system can be used to measure frequencies in the range of 600 — 10,000 MHz. At lower frequencies the cavity becomes excessively long and at higher frequencies the dimensions become very small. The arrangement illustrated is

Microwave Power Measurement Techniques: Microwave Power Measurement Techniques can be done by the use of wavemeters. A wavemeter is an adjustable resonant circuit provided with a calibration that gives the resonant frequency in terms of the settings of the tuning adjust­ment. Wavemeters are used to measure frequency when the higher accuracy of a primary or