The invention discloses a special 
signal generator for medical 
treadmill exercise calibration. The 
signal generator comprises a 
power module, a DA wave generating module, a 
chip wave generating module and a waveform output interface module. The 
power module is used for supplying power to the DA wave generating module and the 
chip wave generating module; and a standard 
heart rate signal, which is transmitted by the DA wave generating module, and sine 
waves and square 
waves, which are transmitted by the 
chip wave generating module, are outputted by virtue of the waveform output interface module. Meanwhile, the 
signal generator disclosed by the invention, in accordance with waveforms and indicators required by the medical 
treadmill exercise calibration, can achieve the reversal design of the input digital quantity and attenuation multiple of a digital-to-analogue conversion chip in an amplitude regulating module and the 
capacitance values of 11 capacitors in a frequency regulating module. The 
signal generator disclosed by the invention is specially applicable to the calibration of medical 
treadmill exercise electrocardiograph parameters, and the 
signal generator has the advantages of stable output waveform, convenient calibration and the like.