  The calibration process for the hybrid array pixel detector designed for High
Energy Photon Source in China, we called HEPS-BPIX, is presented in this paper.
Based on the threshold scanning, the relationship between energy and threshold
is quantified for the threshold calibration. For the threshold trimming, the
precise algorithm basing on LDAC characteristic and fast algorithm basing on
LDAC scanning are proposed in this paper to study the performance of the
threshold DACs which will be applied to the pixel. The threshold dispersion has
been reduced from 46.28 mV without algorithm to 6.78 mV with the precise
algorithm, whereas it is 7.61 mV with fast algorithm. For the temperature from
5 to 60 , the threshold dispersion of precise algorithm varies in the range of
about 5.69 mV, whereas it is about 33.21 mV with the fast algorithm which can
be re-corrected to 1.49 mV. The measurement results show that the fast
algorithm could get the applicable threshold dispersion for a silicon pixel
module and take a shorter time, while the precise algorithm could get better
threshold dispersion, but time consuming. The temperature dependence of the
silicon pixel module noise is also studied to assess the detector working
status. The minimum detection energy can be reduced about 0.83 keV at a 20
lower temperature.
