Frequency meter

Quick view of PC RS232 Frequency Counter

This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 - 30MHz with an input sensitivity of greater then 100mV. The probe connects to the PC serial port. So by using the crystal oscillator already present on your PC serial card and software calibration, the Probes' external circuitry is kept to a minimum. Probe 9 can also be used as a logic probe/analyzer using included software (LPROBE92.EXE)...

Frequency Meter using PC

Frequency Meter using PC

Here is a simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i.e. at low frequency, period is measured for a complete wave and frequency is calculated from the measured time-period. Cascaded binary counters are used for converting the high-frequency signals into low-frequency signals. The parallel port of a computer is used for data input from binary counters. This data is used for measuring time and calculating the frequency of the signal. The block diagram shows the basic connections of the counters and parallel port pin numbers on 25-pin D connector of a PC (control register 379 Hex is used for input)...

Analog Mains Frequency Meter

Analog Mains Frequency Meter

Mains frequency is pretty stable and it is unlikely that you have to measure it but if you have an emergency generator you might find this circuit useful as it will give an indication whether the generator is running too fast or too slow. Actually you can use the mains frequency to calibrate it by adjusting the 25K multiturn trimmer until it reads 0. The odd looking components values are easily obtained using standard values: 3777 is 3900 in parallel with 120K?, 4020 is 3900 and 120 in series, 570nF is 470nF with 100nF in parallel and 400nF is 4 x 100nF capacitors in parallel. Components should be chosen for their stability and precision. 1% tolerance would be ideal but 5% is acceptable so long as you measure them with a good meter. ..

1 GHz Frequency Counter

1 GHz Frequency Counter

This very simple counter can be used to measure the frequency of various wireless devices. Applies in reviving the transmitter and its operation as a control monitor frequency. It can be used as a scale to the receiver. Due to the simplicity of the counter should not miss any of the equipment bastlí?e that similar facilities are still owned. Buying the parts is not a significant financial burden and required the program to the PIC is available for download. To measure the frequency of the oscillator (either the transmitter or receiver), use coaxial cable (RG58 is suitable) connected to the input port counters. At the end of the cable loop from the solder wire and place it on the oscillator coil. In some cases, the cable can be connected through a resistance of about 1 to the output amplifier stage for the oscillator...

Frequency meter 1KHz to 1MHz

Frequency meter 1KHz to 1MHz

This circuit is a frequency meter, low cost. It covers region 1HZ until 1MHZ. The IC1 schmitt trigger that it regulates the signal of entry and him changes in reasonable level suitable for the IC2-3-4. With the tenth pulse in the entry of IC2/1, is produced a pulse '' carry '' in the IC3/5. The same moment the IC2 causes the depiction in the DIS1, show [0], the IC3 causes the DIS2, to show [ 1 ]. When in the entry of IC3 it reaches and the tenth pulse, the DIS2 show [ 0 ] and the DIS3 show [ 1 ], (with total depiction 100, having the display in right order). The exit '' carry'' off IC4/5, can be used in order to it turns on the decimal point (comma) the DIS1, in order to it shows a situation over the limits of measurement. The timed begins with the one of half double timer (IC5A). ..

Frequency counter up to 1MHZ

Frequency counter up to 1MHZ

The MK50398 is one modern decimal counter up/down of six tens, with control of screen LED of seven segments and flip-flop of storage. Counter it can measure additive and abstractively. The IC MK50398 is ideal for manufacture frequency counter as the particular circuit. The frequency of measurement is from 0 HZ until roughly 1MHZ. ..

2.5 GHz Frequency meter with 2x16 LCD display

2.5 GHz Frequency meter with 2x16 LCD display

This project explain a very powerful frequency counter which has many useful software functions. The software can add or subtract 3 different IF frequencies (±455 kHz ,±10.7 MHz and ±21.4 MHz). You have also two level of resolutions, 1kHz and 100Hz. The main oscillator can be on-board 13MHz or external 10 MHz. The counter data can easy be transmitted to computer with RS232 cable. The counter is based around a LCD display with 2 lines and 16 chars. I have used a HD44780 based display which is very common. A PIC16F870 circuit controls all counting and display functions. A prescaler is added to make it possible to measure up to 2.5GHz with high sensitivity. The Display Module Size (W x H x T): 80mm X 36mm. The controller PCB has the same size. This makes the unit very small and slim...

Frequency prescaler for multimeter up to 2.5GHz

Frequency prescaler for multimeter up to 2.5GHz

This project will describe a prescaler which will work up to 2.5GHz and with very high input sensitivity. The prescaler will divide the input frequency with either 1000 or 10.000. The divided output signal is 0/5 volt and can be connected to your instrument as it is. The divider ration is set by a jumper (switch). A PIC 16F84 handle all communication to the prescaler. The main part of this project is the PIC16F84 and a prescaler LMX2322. The input of the LMX2322 is symmetrically at pin 7 and 8. The input impedance is about 100 ohm and with R7 you form an input impedance of 50 ohm. Transistor Q1 forms a buffer for the output frequency which is the divided signal. The output is TTL level and can be directly connected to any instrument. SW1 is the switch that set the divider ration...

frequency counter

frequency counter

The frequency counter is the most popular instrument in the home maid instruments. I think that the reason why it is built widely is: it can be built easily because it is digital circuit, it is generic measurement and many construction kits are available. Many electronics hobbyists will experienced to build any frequency counter. This project is second trial for me. But building two ordinaly frequency counter is not smart so that some additional functions ware impremented to the frequency counter. The function is not that abundant compared to generic universal counter however it can measure pulse period/width besides frequency, I named this project "Universal Counter"...

Programmable frequency meter

Programmable frequency meter

The basic idea comes from the AN592 Microchip application note: "Frequency counter using PIC16C5x". where you may find a simple software wich implements a frequency counter using a PIC microcontroller.I wrote a specifically designed software to improve the counter resolution, to handle the IF mode and value by means of an operating menu, to decode and edit the read frequency on an LCD display. The result was a simple and effective device, equipped with a free software available to those who could be interested...

Wireless Coupled Frequency Meter

Wireless Coupled Frequency Meter

A 0 to 2 MHz ferquency meter with a Minimum Mass Wireless Coupler, based on the ATMega8.Range to the Minimum Mass Base Unit is 10 to 15 cm. Since the frequency meter is battery operated, it can be floated from ground, making life in and around the test bench a lot simpler. No need to connect it to the computer or LCD display - just turn in on and place it next to the base unit. A simple one chip frequency meter was the first instrument I updated with the Minimum Mass Wireless Coupler. The frequency meter is self-contained, including batteries. The only external electrical connection is pair of wires to connect to the signal being measured. ..

Frequency Meter and Pulse Generator with AT902313

Frequency Meter and Pulse Generator with AT902313

Power input is to a 7805 5 volt regulator. A pair of LEDs is connected between the 5 volt supply and ground, with current limiting resistors in series and one pin on the AT90S2313 shunts the current through one LED or the other. When one LED is on, the device is "ready", that is not generating pulses on the output and not measuring input frequency. When the other LED is on, the devise is actively generating pulses or measuring frequency. As a consequence, one of the LEDs is on at a time allowing quick visual confirmation that power is applied and the state of the device. The serial interface is the AT90S2313's internal UART connected to the outside world via RS-232 using a Maxim MAX232 interface chip, which derives RS-232 drive voltages from the 5 volt supply...

330 MHz prescaler for AVR frequency meter

330 MHz prescaler for AVR frequency meter

These parameters are expected with an approximately 50% square wave up to frequencies of seveal MHz, and symmetric sine waves at higher frequencies. The primary limitation is based on the maximum clocking rate specification for the MM74HC6040 ripple counter in use in the Slightly More Serious Frequency Meter project. Selection of faster parts and careful circuit layout can extend the upper limit of the useful frequency range. The lower frequency imit is the lowest sine wave input frequency for the MCT12080 at which the input of the MCT10290 does not osccilate...

AVR Frequency Meter

AVR Frequency Meter

This is design for a frequency meter based on AVR microcontrollers. Maximum input frequency is specified to be 30 MHz in the multi-chip configuration, and in single-chip configuration, there are both 5 MHz and 10 Mhz versions operating with 10 and 20 MHz crystals, respectively. All versions have 9 1/2 digit resolution. I have used multi-chip version at 40 Mhz, and depending upon the actual chips you use and your layout, it can work at much higher input frequencies. The 10 MHz single-chip version using the ATtiny2313 is ideal for use with a X10 or X 100 prescaler. ..

RF Inductance adaptor for multimeter

RF Inductance adaptor for multimeter

The circuit's operating principle is that if you make a pulse width proportioal to inductance, and keep the pulse frequency and amplitude constant, and then pass the pulse through a low pass filter so that only the average voltage comes out, the resulting DC voltage is proportional to the inductance. Stated another way: Pulse width = Inductance X some constant. DC out = Pulse width X Pulse Ampltude X Freqency. Where DC out and Pulse Amplitude is in volts, and Pulse width is in seconds and pulse frequency is in Hz (1/seconds). ..