This frequency selective wave analyser has a narrow pass band filter that can be precisely tuned to measure the amplitude of a single frequency component in the audio range of 20Hz to 20KHz. Precision potentiometers tune the filter to the desired frequency, while close tolerance capacitors select the frequency range. The instrument drives the selected signal to a meter circuit and optional buffer amplifier, and has a very narrow 1% bandwidth for accurate measurement.

1. Frequency selective
wave analyser

2. Wave analyser
type
• It of two type
• Resonant
• Frequency selective wave analyser
USE
• It is voltmeter which can accurately
tuned to measure amplitude of
single frequency component

3. Use:
This wave analyser is used for measurement in audio
frequency range (from 20Hz to 20KHz).
This wave analyser has a filter section with a very narrow
pass band which can be tuned to the frequency of interest.

5. Precision Potentiometer are used to tune the filter to any desired
frequency within the selection pass band.
Close tolerance polystyrene capacitors are generally used for selecting the
frequency range.
Driver amplifier feeds the attenuated waveform to a high Q active filter.
The filter consist of cascaded arrangement of RC resonant section and
filter amplifier
Input apply to attenuator is set by the meter range switch on front panel.
This act as range mutliplier and permits large range of signal amplitude to
be analysed without loading the amplifier

6. Final amplifier stage supplies selected
signal to the meter circuit and to an
untuned buffer amplifier.
Buffer amplifier can be used to drive
a recorder or an electronic counter.
Meter is driven by an average type
detector and usually has several
voltage ranges as well as a decibel
scale.
Bandwidth of instrument is very
narrow, about 1% of selected
frequency.

7. Attenuation curve of wave
analyser.

9. DONE BY:
NIDHI MARU AKASH THAKAR