Cheap frequency meter circuit using 555 and ca3140. Then set the trimmer p1 to display the correct value. In above circuit diagram pulse generator is used to generate square wave of any frequency. Panel view of the type 1150a digital frequency meter. Frequency meter for ac line circuit diagram electronic. Frequency meter detailed circuit diagram available. In addition to determining the frequency and frequency deviation, it also maintains a system clock and a synchronous clock and finds the time difference between them as a measure of the time. The meter is intended to be portable and can be powered by a 9v alkaline battery.
Frequency counter construction article apogee kits. Our integrated circuits and reference designs help you create smarter electricity meters with advanced security and connectivity features to meet system design requirements. The msp430afe is a slave metrology processor and the msp430f6638 is the hostapplication processor. One of the many frequency meters that directly indicates frequency is reed type meter of the following figure. The core idea of equal precision measurement is how to ensure the actual gate time is an integer multiple of the measured signal cycle. Construction of electrical resonance type frequency meter. It counts the number events occurring within the oscillations during a given interval of time. Frequency of a periodic signal is the number of cycles it repeats per second. Do you know how to increase the measuring range, like in the mhz range. A voltage regulator is used to stabilize the supply rail to 5v.
Electrical resonance type frequency meter about circuit. Here we are using a very popular ic for voltage measurement namely icl7107cs7107. Circuit diagram frequency meter advanced electronic. A single phase microcontroller based energy meter conference paper pdf available in conference record ieee instrumentation and measurement technology conference 2. The unknown frequency signal is fed to the schmitt trigger. In this type of meter, many reeds are mounted on a common support, with their free ends visible on the meter face. Nov 26, 2018 frequency counter circuit operation make the connections as per the circuit diagram and apply the pulse generated by arduino at port 3 pin p3. Pdf a single phase microcontroller based energy meter. Digital frequency meter circuit diagram and working principle.
The meter scale must be calibrated and with a little effort, you can get good results. The input signal is amplified and converted to a square wave by a schmitt trigger circuit. Metering and instrument circuits archives circuit diagrams. Led digital voltmeter circuit diagram with ic7107 the voltage intended to measure is fed to the circuit through resistors and capacitors as shown in the figure. Introduction to frequency meter universal counter need of frequency meter a digital frequency meter is a generalpurpose, basic, digital counter for measuring, setting, and monitoring frequencies, for counting random events, and for industrial counting applications. Jun 15, 2018 construction of weston frequency is as compared to ferrodynamic type of frequency meter. Homemade inductance meter circuit homemade circuit projects. The design is based on an original idea of rae perala, helsinky, finland. So what we are going to make is a frequency counter circuit, which can also be called as a frequency meter.
The frequency to be measured is amplified by q1, but the input signal is limited to a maximum of about 2v peaktopeak by r1, d1 and d2. This page contain electronic circuits about at category frequency meter circuit. With the component values listed in the schematic diagram below, the counting time is 1s. This is a simple panel frequency meter circuit diagram to measure the frequency of 230v ac mains. Digital frequency meter is commonly called a counter since it determines the frequency by electronically counting the number of cycles of an unknown signal. We have connected 6khz square wave with interrupt pin to measure its frequency. Block diagram 2 block diagram figure 1 shows the system block diagram of the evm. Make sure that maximum analog input voltage should be less than 25v dc. Analog frequency meter working principle your electrical. Two common types of frequency meters are the vibratingreed frequency meter and the movingdisk frequency meter. Design of equal precision frequency meter based on fpga. Beyond this frequency range, sensitive equipment may start malfunctioning. The evm is divided into the metrology portion that has the msp430afe and the application portion that has the msp430f6638. Browse and share custom components for use in circuit diagram.
Two signals having phases p o and p x respectively are applied as inputs to the preamplifier and attenuation circuit. Audio frequency meter using 555 ic circuit diagram. Jan 11, 2019 the article discusses a simple yet accurate, wide range inductance meter circuit. We will do this using almost all digital circuitry rather than analog. Digital frequency meter is a general purpose instrument that displays the frequency of a periodic electrical signal to an accuracy of three decimal places. Connect a battery or any voltage source at the input of the voltage sensor. Smeter circuits radio receivers amateur radio archive. The secondary output of the transformer is rectified by diodes d1 and d2, filtered by capacitor c1 and given to regulator ic1 to produce regulated 6v dc. Classic 100w hifi darlington transistor amplifier circuit schematic circuit diagram may 3, 2020 simple rgb led led effect circuit schematic circuit diagram may 2, 2020 microc examples c codes proteus isis circuits schematic circuit diagram may 1, 2020. Multi function digital frequency meter circuit 0100mhz. Analog frequency meter working principle when the instrument is connected to the supply, currents pass through coils a and b and produce opposing torques. Design and construction of an autorange digital frequency meter. Basic principal of operation a simplified block diagram, indicates the principal circuits of the instrument and the signal flow.
Applications of digital frequency meter working principle of digital frequency meter 1. Simple frequency meter here is a simple frequency meter with which input frequency can be determined by simply measuring the values of two resistors and a little bit of computation. Audio watt meter circuit diagram with parts list audio wattmeter circuit diagram. The combination of a frequency tovoltage converter fvc and a dualslope, analogto digital display converter adc makes a small 2chip frequency meter that can be run from one 9volt battery. Frequency meter circuit the ac mains supply is stepped down by transformer x1 to deliver a secondary output of 9v09v ac, 250 ma. The figure 1 shows the circuit diagram of the frequency meter, the circuit based on the digital ic 74121.
Mar 18, 2018 functional block diagram of digital frequency meter contents hide 1. These three intervals repeat themselves sequentially. A frequency meter provides a means of measuring this frequency. To the other terminal of the gate, a pulse of 1 sec is applied as shown in the fig. This requires the design to estab lish a certain relationship between the actual gate time and the measured signal 3. Whenever one or both of the track circuit relays is released, indicating the presence of a. The design utilizes only transistors as the main active components and a handful of inexpensive passive components. You can connect any device to this pin which frequency you want to measure. Many are instruments of the deflection type, ordinarily used for measuring low frequencies but capable of being used for frequencies as high as 900 hz. Field strength meter electronic circuits and diagrams. How to connect frequency meter in metering circuit.
The block diagram of a digital frequency meter is shown in fig. It uses and lsi counterdisplay driver, lcd readout, and a few logic chips for timebase and timing pulse circuitry. Connect a digital multi meter at the input terminals of the voltage sensor. Introduction to frequency meter universal counter need of frequency meter a digital frequency meter is a generalpurpose, basic, digital counter for measuring, setting, and monitoring frequencies, for counting random. Condition monitoring of audio frequency track circuits. The signal waveform whose frequency is to be measured is converted into tngger pulses and applied continuously to one terminal of an and gate. A retriggerable monistable multivibrator and a d flipflop can form a simple, yet reliable frequency comparator that compares an input frequency with a. Aug 21, 2008 designed to fit on a breadboard, ikalogics frequency meter uses only 3 components and 8 resistors including an atmega16 this article shows how to build a small, cheap and simple frequency meter, without any fancy, out of reach components. Digital integrated circuits can be used in the design of an analogue frequency meter with a frequency range to several mhz. The frequency counter circuit can be divided into three main parts the power supply, the input amplifier, and the digital circuitry. The resistor r1 and capacitor c1 are used to set the internal oscillator clock frequency at 48hz, clock rate at which there will be three readings per second. A low frequency in the input is applied by using s1 while the tr2 regulates the suitable frequency meter source with a 9v supply. Jul 31, 2018 operating principle of digital frequency meter. Pdf design of simple frequency meter using pll technique.
The tester is very sensitive that the power line frequency will be displayed when the input is touched by a finger. Given below is the circuit diagram for the weston type frequency meter. Oct 06, 2018 now give the connections as per the circuit diagram. Frequency meter the principle of frequency measurement is simple. In this project we are going to build a digital voltmeter without using any microcontroller. This circuit converts the sine wave output of the square wave 100k watt resistor and zener diode 1 watt 6. A frequency meter is an instrument that displays the frequency of a periodic electrical signal various types of frequency meters are used. Analog frequency meter circuit using ne555 this 1khz linearscale analog frequency meter circuit uses the 555 as a pulse counter. In order to construct a circuit diagram we need two coils, three inductors and two resistors. Digital frequency meter with lcd display using pic16f877a. Mains line frequency meter circuits engineering projects.
Thus in low frequency region it is better to measure period rather than frequency. Since frequency is a measure of pulses per second, simply reset the counter and count the number of input pulses in 1 second, then display it. The frequency of input signal is the displayed count, averaged over a suitable counting interval out of 0. Programmable phase shift circuit for an integrated powermeter. There are two terminals on the back of a panel mount frequency meter. Simple panel frequency meter circuit diagram lekule. Sep 24, 2019 this cheap frequency meter circuit that we show to you. All alternating voltage sources are generated at a set frequency or range of frequencies.
Designed to fit on a breadboard, ikalogics frequency meter uses only 3 components and 8 resistors including an atmega16 this article shows how to build a small, cheap and simple frequency meter, without any fancy, out of reach components. Two bits determine the phase shift resolution, since the frequency of this part of the delay line is 256khz. Simple frequency meter electronics project circuit. The number of pulses counted at the output terminal during. As the preset period gets completed, the value in the counter display on the screen and the counter reset to zero. It is connected across the hot and neutral if its voltage is 120 volts.
The current is converted to voltage by passing it through low shunt resistance. Generally, the line frequency is 50 hz, which may vary from 48 hz to 52 hz. The circuit works like many other digital measurement circuits in that it converts the quantity to be measured into a time interval, then measures that time. The controls measures sector as well as the display is used a single master ic. Posted thursday, january 12, 2012 the circuit was designed to create a low cost frequency meter that will cover the range of 1 hz to 1 mhz with a digital indication using three 7segment displays. Aug 14, 2019 to read left to right on increasing signal strength, the meter deflects from right to left when current is increased.
While touching the input with a finger, adjust p1 slowly until the correct frequency is displayed. The ac mains input 230v is stepped down using 9v09v step down transformer. Direct reading frequency meter by the amplifier, and trigger oneshot circuit and table top components. Frequency counter detailed circuit diagram available. The following image shows another design of a frequency meter circuit which is even more simple than the above discussed circuit.
The circuit diagram of the frequency meter is shown in the fig. The collector current of the q1 will be proportional to the strength of this signal and will be shown in the meter m1. Easy way of understanding conceptual topic authentic instrumentation electronics 3rd year, 5th sem reference book. Digital frequency meter frequency measurement high frequency. Pdf design of equal precision frequency meter based on fpga. Notice in the diagram at the bottom of page 57 that a multielement tube is used.
How the circuit worksin figure 1 is the complete circuit of the cheap frequency meter. Functional block diagram of digital frequency meter contents hide 1. The circuit of mains line frequency meter is build around timer ic 2 ne555, oscillatorcumdriver ic ic 3, decode counter, and gate ic ic 6, seven segment display and 6 volt regulator ic. Sep 06, 2019 the multi function digital frequency meter circuit 0100mhz, is an instrument that can measurement many things in a single display with led 7 segment 8 digit.
Heres a simple panel frequency meter to measure the frequency of 230v ac mains. As the name suggests its action depends upon the electrical resonance. The multi function digital frequency meter circuit 0100mhz, is an instrument that can measurement many things in a single display with led 7 segment 8 digit. Digital frequency meter frequency measurement high. Can anybody help me with this idea because i am finding it. Hook it to a power supply about 5v and connect known input frequency.
The simple proposed design can measure frequencies up to 40 mhz with errors below 1%. Analog frequency meter circuit electronic circuits. Meter counter circuitscircuits and schematics at next. It can be shown that the frequency read directly from the meter. Idea to build simple frequency meter from old calculator this circuit use a simple ideal is the calculator count a frequency within range 1 second. I am trying to use a set of decade counters interfaced with a 7 segment driver and decoder. Implementation of a singlephase electronic watthour meter. The signal will sound, the audio amplifier circuit into vu meter. Simple digital voltmeter circuit diagram using icl7107. In this way the meter reading can be adjusted so that the voltage reading directly represents the unknown input frequency. The controls measures sector as well as the display is used a single.
We would interpret the voltage reading across the shunt resistor between circuit nodes 1 and 2 in the spice simulation directly as amps, with 7. It mainly consists of a fixed coil and a moving coil. The sound frequency meter circuit can be calibrated using the power line frequency. Two lowcost integrated circuits can be combined to create a simple digital frequency meter. Frequency meter with 74121 monostable multivibrator. Design and hardware implementation of a digital wattmeter. Digital frequency meter circuit diagram and working. Line voltage to one terminal and the neutral wire to. How do you connect frequency meter in circuit answers. A monostable multivibrator can act as a frequencytovoltage converter because it produce a fixed pulse width, with the repetition ratedensity is proportional to the triggering input frequency. When you connect it to the 230v ac line, the display shows the line frequency. Ammeter design dc metering circuits electronics textbook.
It can be directly detected in the read head of the table 1ma signal, th. Each reed has its own natural frequency of vibration. The block diagram of the period mode of the digital frequency counter is as shown in the fig. Digital voltmeter circuit using 8051 analog to digital. The standard unit of frequency is the hertz, abbreviated hz frequency measurement frequency measurement is carried out by measuring the number of cycles in one second, this method requires time of one second. As i have configured the timer 1 as counter, using the tcon bit tr1, i will be counting the pulses for a duration of approximately 100 milliseconds by making tr1 high and low. Frequency meter therefore measures with a resolution of 1hz. This line frequency meter having frequency measurement range from 10. The digital frequency meter in this instructable is able to measure upto 250 khz. The block diagram of a basic circuit of a digital frequency meter is shown in fig. The basic circuit of a digital multimeter is always a d.
Connect the frequency meter at point a or b and ground. Here resistor r2 acts as the load for the amp and it should be able to withstand twice the maximum power of the amp you are going to measure. For voltage nodes, either the a or b frequency range is covered, depending on the transmitter frequency. Implementations of equal precision frequency meter. Can measure the frequency of 100 hz full scale to 100khz full scale. This paper describes a very simple and compact design of digital line frequency meter using pic microcontroller. Power on the circuit and read the frequency at point a or b. The signal may be amplified before being applied to schmitt trigger. A digital voltmeter or with a bit less precision an analog one, can be used for frequency measurements up to 200khz using this circuit.
So if we count the number of cycles recorded in a second it will directly read the frequency. Sometimes the s meter is used with a separate amplifier circuit. Pdf on jan 1, 2000, rabee hashim alabbasi and others published design of simple frequency. Introduction our goal here is to build a voltmeter. This ic is connected as the schmitt trigger circuit to extend the input signal to act up and force you to convert the input signal to a square wave with. A frequency meter has a small device which converts the sinusoidal voltage of the frequency into a train of unidirectional pulses. The electrical resonance type frequency meter is an indicating type instrument. Using icl7107, we can build accurate and very low cost voltmeter. The capacitor c3 and inductor l1 forms a tuned circuit to receive a particular frequency the frequency of your transmitter. The input circuits have a small voltage hystere sis, or backlash. Audio wattmeter or audio powerlevel meter circuit with diagram.
Design and construction of digital line frequency meter. Whether for single or polyphase meters we have the right ingredients for accurate energy measurement and efficient communicat. In this diagram, the square wave is differentiated and clipped to produce a train of pulses, each pulse separated by the period of the input signal. The proposed inductance meter circuit can measure inductance or coil values accurately over the given ranges and as a bonus the circuit is also. Five decade counter cum7segmentdriver ics each cd4033 are connected in tandem to form a 5digit decimal counter. The frequency of the two inputs is the same but their phases are different. These two bits of the control line can give up to 2x0. This audio frequency meter uses 555 ic as a monostable multivibrator oneshoot trigger. Frequency meter need to connect parallel with the circuit, as its a sensing device. This is a schematic and block diagram of a 2mhz frequency counter.
Input signal processing amplifier comparator input analog output digital amplifier. The circuit requires a 6v regulated power supply, obtained from ic2 and a 9v battery, with a total current drawing of 2. Generally, the line frequency is 50 hz, which may vary from 48 hz. The next bit of the control word can make a phase shift of 0. Oct 16, 2014 introduction to frequency meter universal counter need of frequency meter a digital frequency meter is a generalpurpose, basic, digital counter for measuring, setting, and monitoring frequencies, for counting random events, and for industrial counting applications. Simple panel frequency meter circuit diagram electronic. Circuit description mains line frequency meter circuit. Simple frequency meter or frequency counter circuit with lcd display and avr micro controller. Im doing a similar project using 8051 and according to its specs, it can measure upto 12 mhz, but the circuit i have can do only upto 250 khz. Electricity meter integrated circuits and reference designs. There is a laminated iron core of varying crosssection.
The diode d1 detects the signal and applies to the base of transistor q1 mpsa 18. I am trying to build a digital frequency meter ranging from 9 hz to 999khz. The first is a opamp ic is work faster and has the input impedance is very high. Ic1a is a dtype ff that is clocked by 1hz10hz sw5 from the timebase. Frequency is the number of complete cycles per second in alternating current direction. Functional block diagram based on the working principle described in section ii, the functional block diagram of the entire circuit can be presented as fig. The digital multimeter is an instrument which is capable of measuring a. Here a circuit meter ac line frequency super simple and easy construction that can measure the frequency of 10hz to 100hz at a voltage of 110 v to 240 v.