The dynamic calibrator is based on the microprocessor technology and the multi-channel gas calibration equipment developed specifically for precise gas analyzer. Adopting the high precision quality flow controller and standard gas, the calibration standard gas is provided for the zero and span test of multiple gas parameters, which can provide four air sources simultaneously. The dynamic calibrator can be fitted with a built-in programmable ozone generator, which is not only used for accurate and reliable ozone calibration, but also for GPT to produce NO2. The ozone generator is driven by multi-point segment, which can ensure the repeatability and accuracy of ozone concentration.