Method for calibrating a THz measuring apparatus to a measurement object , including at least the following steps: providing a THz measuring apparatus having a plurality of pivotable THz sensors , arranged in a circumferential direction around a measuring chamber , for putting out one transmitted THz beam each and receiving one reflected THz beam along a sensor axis (B), orienting the THz sensors into a starting position into the measuring chamber , in which a measurement object is received, allocating the THz sensors to at least one first sensor group (G1) and second sensor group (G2), first calibration adjustment step (KS1), in which the second sensor group (G2) is adjusted as an adjustment group by means of the first sensor group (G1) as a starting group, second calibration adjustment step (KS2), in which the first sensor group (G1) is adjusted as an adjustment group by means of the previously calibration adjusted second sensor group as a starting group, wherein in each of the calibration adjustment steps (KS1, KS2) = by means of the THz sensors (S1, S3, S5, S7) of the starting group (G1), spacing points (P1, P3, P5, P7) on a surface of the measurement object are determined (St4-1) = sensor correction angles (α) of the THz sensors (1; S2, S4, S6, S8) of the adjustment group are determined by means of the spacing points (P1, P3, P5, P7) determined by the starting group, (St4-2), = the THz sensors (S2, S4, S6, S8) of the adjustment group are calibration adjusted about the determined sensor correction angles (α) (St4-3). providing a THz measuring apparatus having a plurality of pivotable THz sensors , arranged in a circumferential direction around a measuring chamber , for putting out one transmitted THz beam each and receiving one reflected THz beam along a sensor axis (B), orienting the THz sensors into a starting position into the measuring chamber , in which a measurement object is received, allocating the THz sensors to at least one first sensor group (G1) and second sensor group (G2), first calibration adjustment step (KS1), in which the second sensor group (G2) is adjusted as an adjustment group by means of the first sensor group (G1) as a starting group, second calibration adjustment step (KS2), in which the first sensor group (G1) is adjusted as an adjustment group by means of the previously calibration adjusted second sensor group as a starting group, wherein in each of the calibration adjustment steps (KS1, KS2) = by means of the THz sensors (S1, S3, S5, S7) of the starting group (G1), spacing points (P1, P3, P5, P7) on a surface of the measurement object are determined (St4-1) = sensor correction angles (α) of the THz sensors (1; S2, S4, S6, S8) of the adjustment group are determined by means of the spacing points (P1, P3, P5, P7) determined by the starting group, (St4-2), = the THz sensors (S2, S4, S6, S8) of the adjustment group are calibration adjusted about the determined sensor correction angles (α) (St4-3). = by means of the THz sensors (S1, S3, S5, S7) of the starting group (G1), spacing points (P1, P3, P5, P7) on a surface of the measurement object are determined (St4-1) = sensor correction angles (α) of the THz sensors (1; S2, S4, S6, S8) of the adjustment group are determined by means of the spacing points (P1, P3, P5, P7) determined by the starting group, (St4-2), = the THz sensors (S2, S4, S6, S8) of the adjustment group are calibration adjusted about the determined sensor correction angles (α) (St4-3). <EOS>