Automotive & SpareParts

Suppression of the fundamental freedoms Analyzer
Block diagram THD Analyzer
This is a special type of THD analyzer with an essential principle for frequency input wave is encrypted, so remove it from the spectra of meters used in measuring distortion and a total profit of all the harmonics are calculated, which can be caused by the total harmonic distortion. Construction

Frequency Response Analyzer suppression of basic freedoms
Block diagram of the fundamental freedoms of opposition Analyzer is shown Figure 1 The basic structure consists of three main parts: the input impedance of the sector with Matches rejection amplifier and power measurement circuit. Please note feedback from the bridge amplifier pre-amp section, which allows rejection of the circuit to operate in more detail.

Working with Applied Wave input impedance is matched to the rejection of the circuit impedance attenuator and Matcher. This signal can then be used to pre-amplifier that raises the level to the desired value. The next section consists of Vienna Bridge. The bridge is set at the fundamental frequency, and frequency control, it is a balanced output to zero by adjusting the control of the bridge, which gives the hollow part of the frequency of rejection. When the Vienna Bridge, the bridge amplifier, prolonging the harmonic voltage levels measured at a higher level. In BRIDGE AMP cycle consisting of O / P preamplifier I / P, which removes even the slightest influence on the fundamental frequency. The filtered output signal can then be used to monitor amplifier capable instrumentation amplifier. Amplifier to increase the voltage levels are compatible with the scale meter / digital meter that follows. Thus, the total output of the voltage meter shows the amount of distortion present in the wave due to the harmonic quality. References

Modern electronic instrumentation and measurement techniques, Albert D. Helfrick, William D. Cooper
Electronic Communications Dennis Roddy and John Coolen
See also Distortion

Voice quality measurement
ITU-R 468 noise weighting

Speaker measuring the level of equalization
Category: Audio Engineering | Electronic Testing Equipment