Signal source system with frequency meter function

The utility model discloses a signal source system with frequency meter function. This system possesses two kinds of mode: signal source mode and frequency meter mode. Under the signal source mode, utilize the AVR singlechip to set for the frequency as controller scanning key entry, control LCD carries out the frequency and shows to transmit frequency control word signalling source module, the wave form signal of the corresponding frequency of AD9850 chip production in the signal source module obtains the sine wave signal that the frequency spectrum is clean through low pass filter. This signal obtains required sine wave all the way after the amplitude modulation module is enlargied, the inside comparator of sending the AD9850 chip all the way back to produces required square wave, the arbitrary ripples that will need the frequency measurement under frequency meter mode is adjusted the module and is sent the AVR singlechip through treating the wave form, utilizes the inside tally function of AVR singlechip, calculates arbitrary wave frequency value send LCD the demonstration after, such system not only can do the signal source use but also can make the frequency meter and use, with low costs, the convenient application.