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1. A calibration system for a variable capacity hydraulic pump, the calibration system comprising: a hydraulic control circuit comprising: a hydraulic pump being driven by an engine and having a capacity variably controlled based on a current capacity control command value; and a controller programmed with a pump control table representing a relationship between pump capacity values and current capacity control command values, the controller outputting the current capacity control command value based on the pump control table to control the hydraulic pump; a calibration data acquisition means to acquire measured pump pressure data corresponding to each current capacity control command value by measuring a pump pressure corresponding to each current capacity control command value while changing the current capacity control command value output from the controller in a multi-step manner from minimum to maximum; a first table creation means for creating a first table representing a relationship between a factor and pump pressure, the factor representing a relationship between the pump pressure and pump flow rate based on the pump flow rate obtained from specification-based pump capacity at a preset current capacity control command criterion value and based on the measured pump pressure acquired by the calibration data acquisition means; a second table creation means for creating a second table representing a relationship between each current capacity control command value and measured pump pressure based on the data acquired by the calibration data acquisition means; a third table creation means for creating a third table representing a relationship between the pump flow rate and the current capacity control command value by converting the measured pump pressure in the second table into the pump flow rate using the factor in the first table and a pump control table creating means for creating a calibrated pump control table based on an engine rotation speed during pump pressure measurement and the third table; wherein the calibrated pump control table created by the pump control table creation means is used as the pump control table of the controller.
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