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Microchip® glossaryvirtual frequencymeter - instructions
Code: 710 Name: Frvirtual
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The virtual frequency meter comes in a fiber glass printed circuit board with a preprogrammed PIC12C508 on board. It is provided with a cable to connect the module to the serial port of a common PC. And with a clasp to install a battery of 9V and software for Windows 95/98 that is very friendly and it is provided in a disc of 3 1/2, along with the schematic diagram.
Screws are included to install the cables that are required to measure frequencies.
The PIC12C508 microcontroller is the heart of the frequency meter, acts as counter and also is in charge to communicate with the PC.
A crystal of 4Mhz provides the signal of clock for the microcontroller. The rank of frequencies that is able to measure is from 1 to 80Mhz. A 74HC14 integrated circuit and a set of resistances are used to control the level of voltage of the signals to measure. Resistances of 0k, 1k, 5k, 20k, 50k and 100k allow to attenuate the voltage from 5V for the entrance without resistance to 15V for the entrance to 100K.
When it is not known the amplitude of the signal that is going away to measure is recommended to connect it first a the entrance of 100K and reduce gradually the resistance.
Some precautions are necessary to use this instrument:
- The temperature influences in the frequency of the crystal of 4Mhz so there can be small errors.
- As the instrument is 'auto range', the highest frequencies are divided between 128 what can produce small errors.
- In case of replacing the integrated circuit 74HC14, one of high speed is due to use.
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