Constant acceleration tester calibrating instrument

The invention discloses a constant acceleration tester calibrating instrument. A measuring module in the constant acceleration tester calibrating instrument comprises a first microprocessor, a signal isolator and a speed measuring sensor; the speed measurement sensor converts related information of mechanical rotation motion into an electric pulse signal, and the electric pulse signal is sent to the first microprocessor through the signal isolator; the analog signal generation module comprises a second microprocessor and a DDS signal generator; the signal generator receives an instruction of the second microprocessor, controls frequency and phase output of the signal generator, and outputs a predetermined sine wave frequency signal; after a signal output by the signal generator is amplified, filtered and shaped, one path is output to the BNC interface, and the other path is sent to the frequency division inlet of the second microprocessor. The calibration instrument is used for calibration of the centrifugal