Frequency counter wiht range up to 50 MHz, USB connection and high accuracy.



    General Description

    frequency counter schematic
  • This frequency counter is a small module with good electrical properties. It is designed for quick and easy measurement of frequency. Frequency counter is connected with the PC via USB cable and is also powered via this cable. Measured values are displayed on the monitor of a PC or notebook.
  • Frequency counter is designed with regard to achieve good electrical parameters with the minimum requirements for hardware. It contains all the necessary parts that frequency counter should have. 
  • Connection with computers have 2 benefits : there is no need for display and frequency counter also does not need an power supply - needed current takes from PC (via USB). It works well also with the  notebook.

    • Properties
    counter top viewcounter

  •     * Measuring range : 0 - 50 MHz
        * Impedance : 1 MOhm
        * Precision : from range depending, more...
        * Maximal input signal : 10V ss
        * The dimensions of module : 40 x 45 mm
  • The modules are electrically connected directly with the PC. Frequency counter is calibrated using laboratory Frequency counter and deviation of the measured is almost zero. Frequency counter contains preamplifier with high gain , therefore the sensitivity is very good. It makes possible to measure the frequency of the small signals - a few mV.

    • Block diagram of freq. counter

  • 1. preamplifier.
    At the input of frequency counter is limiter consists of 2 parallel diodes, followed by Fet transistor with high input impedance. The next amplifier stage is built with transistor BFR 93A with high gain. Schmidt-Trigger provides signal amplification and form it to TTL level. Thus signal is suitable for processing in microprocesor.

    2. microprocesor as frequency counter
    Frequency measuring provides PIC16F886,that contains all the circuits needed to create frequency counter. Microprocesor 16F886 also sends data to the PC.

    3. USB interface and PC communication.
    Connection with PC is implemented by using USB converter with FT 232RL. FT 232RL is a reliable converter from Usart to  the USB protocol. It uses its own APIs and offers a lot of capacity for communication PC with a USB device.

ddd   Customer solutions. Customization of modules according to your needs.


USB Voltmeter site. - USB LC meter site. - USB Temperature meter site.
Next modules adding in February 2009.
Solutions based on USB, and also wirelles technology. 

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