Abstract：DC high current comprehensive characteristic test device is used to detect the released characteristics

of DC low-voltage electrical overcurrent protection electrical device，which is used in low-voltage electrical

industry for DC products for long time delay，short time delay，instantaneous tripping test and short circuit test.

With the wide application of DC low-voltage electrical products in non-ferrous metallurgy，chlor-alkali chemical

industry，low-voltage power distribution，DC transmission and distribution，new energy and railway applications，

the DC high current comprehensive characteristic test device used for DC electrical product testing needs to be

traced regularly to ensure that it can meet the accuracy requirements of the test detection capability. In the field of

measurement calibration，the present situation of relevant calibration methods was analyzed，and the research

direction of calibration methods of this test device was reviewed. According to the corresponding product of the test

device and the national standard，a new calibration parameter was proposed. Aiming at the calibration problem of

the DC high-current device，the measurement method of optical fiber current sensor was proposed，so as to evaluate the uncertainty of the data generated.

      Key words：optical fiber current sensor；DC high current；calibration parameter；uncertainty assessment