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USB Frequency counter 0 - 50 MHz
USB frequency counter is a small module with good electrical properties. It is designed with regard to achieve good electrical parameters with the minimum requirements for hardware. 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.
USB frequency counter
USB Frequency counter
Range : 0 - 50 MHz
Usage : Technical parameters:
Designed for quick and easy measurement of frequency in range 0-50 MHz. Frequency values are displayed on the monitor of a PC. Size :
Impedance :
Accuracy :
Speed :
45 x 50 mm
1 MOhtm
0,0001 %
5 times/sec

Power suply : from PC via USB connector

Software : USB Measure + API ( build your own application)

Paralel connecting : up to 127 devices connected is possible

This frequency counter is  galvanically connected with a PC. Version with the full galvanic isolation is also supported. It is possible to simultaneously connect up to 127 USB freq. counters. Software instalation is easy and completely automated. More about in the instalation page. Maximum input signal is 10 Vss.

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.
Software + API
Software.
Software in the PC communicates with the USB device and display data on the monitor.
Once installed it is already capable to work immediately.There is no need for settings.
Software can communicate with multiple USB device at the same time. It also allows logs measured data into log file.
COM component.
For developers is supplied COM component, that enables to create own applications.
COM component works with all popular languages like visual basic, C/C++, C#, javascript etc. More info are in help and in the software page.
USB frequency counter software
USB Frequency counter block diagram
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 BFR93A with high gain. Schmidt-Trigger provides signal amplification and form it to TTL level. Thus signal is suitable for processing in microcontroller.
2. Microcontroller as frequency counter.
Frequency measuring provides PIC16F886 ,that contains all the circuits needed to create frequency counter. Microcontroller 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.
More picture
USB frequency counter USB frequency counter frequency counter schematic
Accuracy of freqeuncy counter.
Accuracy of freq. counter depends on the frequency to be measured.
Accuracy for hight frequency: f > 4 MHz is 0,001% ( maximal accuracy is 0,0001% )
Acuuracy for low frequency : f = 400 Hz is 1%
Resolution
4 Hz - 4 MHz : 4 Hz
4 MHz - 8 MHz : 8 Hz
8 MHz to 16 MHz : 16 Hz
16 MHz to 32 MHz : 32 Hz
32 MHz to 50 MHz : 64 Hz