In this note, we are going to know about Digital Frequency Meter and also about its Block Diagram, Working Principle, and Applications as well. Welcome to Poly Notes Hub, a leading destination for engineering notes for diploma and degree engineering students.
Author Name: Arun Paul.
What is Digital Frequency Meter?
A Digital Frequency Meter is an electronic instrument that determines the frequency of a periodic signal. It is commonly used to determine signal properties in a variety of fields, including telecommunications, audio and radio.
Digital Frequency Meter Block Diagram
The basic block diagram of a Digital Frequency Meter includes the following stages –
- Input Signal: It is that signal whose frequency is to be measured.
- Signal Conditioning: This section has filters and amplifiers that adjust the input signal to an appropriate level.
- Schmitt Trigger: It is used to converts the waveform into a consistent digital square wave.
- Frequency Divider (Optional): It reduces the high speed signals frequency.
- Gate Time Selector: It is determines the time interval for counting cycles (e.g., 1 second).
- Counter: It counts the number of pulses within the selected time interval.
- Display: It shows the frequency measurement result, typically in Hz, kHz, or MHz.
Digital Frequency Meter Working Principle
A Digital Frequency Meter counts the number of cycles of an input signal that occur during a set time interval. It converts the frequency of the stream into digital data that can be displayed on a digital screen in Hertz (Hz). The procedure begins with signal conditioning, which involves amplifying or filtering the input signal to ensure precise measurement. The conditioned signal is then sent through a Schmitt trigger, which turns it into the digital square wave required for accurate counting. To make high-frequency signals more manageable, they can be separated using a frequency divider. The signal is then supplied into a counter circuit, which counts the number of cycles or pulses inside the time span.
After the counting is completed, the frequency measurement is presented digitally. The meter’s basic structure typically includes an input stage for signal conditioning, a Schmitt trigger, a frequency divider (if necessary), a gate time selector that determines the counting interval, a counter circuit, and a digital display. Digital frequency Meters are essential in a variety of industries, including telecommunications, broadcasting, research and development, and industrial automation, as they measure and monitor signal frequencies and motor speeds. They are also useful in audio engineering for tuning audio equipment and in classrooms for practical demonstrations of electronics and measurement techniques.
Application of Digital Frequency Meter
Here are the uses of Digital Frequency Meter –
- Used to measure signal frequencies in transmitters, receivers, and other communication devices.
- Maintains precise frequency in radio and television transmitting.
- Used in electrical systems to measure and monitor motor speeds, generators, and other rotating equipment.