Bias error and linearity error influence the measurement precision of three axis fluxgate magnetometers. So, it is important to obtain and calibrate these errors. Bias error and linearity error of a German made DM-060 digital magnetometer are measured by precise electromagnetic devices. Firstly, bias of each axis is obtained by an alternating weak electromagnetic standard equipment. A method by comparing mean absolute error before and after calibration is proposed to demonstrate the bias results credibility. Then, the rotating method is proposed to measure bias by a horizontal barrel shield equipment. Lastly, linearity error of each axis is obtained by a low DC electromagnetic field standard system, and linearity coefficients are calculated by linearity fitting. Experimental results show that bias of X, Y and Z axis is -2.9 nT, -1.4 nT and 3.9 nT by the alternating weak electromagnetic standard equipment, respectively. Bias of each axis changes to -5 nT, -2.5 nT and 10.5 nT by the horizontal barrel shield equipment a year later. Linearity error of X axis, Y axis and Z axis is 3.78-e005, 4.51-e005 and 7.92-e005, respectively. These experimental results show that there is a promising application to use high precise electromagnetic devices for measuring and calibrating bias error and linearity error.Keywords-three axis fluxgate magnetometer; bias error; linearity error; alternating weak electromagnetic standard equipment; horizontal barrel shield equipment; low DC electromagnetic field standard system I.