为了对VP宽频带倾斜仪进行现场校准，设计了一款基于单片机 AT89 C51的新型现场自动校准装置。经验证该装置在+8V激励电压情况下与高精度激光干涉仪结合使用，其校准相对误差为0.36%，满足小于1%的校准相对误差要求。%The vertical pendulum (VP)broadband tiltmeter is a type of earthquake precursor observation equipment that records the inclined earth tide.The scale value represents the relation-ship between the measured physical quantity and the output voltage.Its accuracy plays a key role in data reliability.The calibration process provides the scale value for the instrument.Most tradi-tional calibration methods,e.g.,plat calibrations in the laboratory and manual calibrations on site, cannot satisfy the accuracy levels required in scientific applications,or might affect the continuity of observations.In this study,we investigate an on-site automatic calibration device,in which small-scale shifts are introduced by a piezoelectric ceramic under the control of a single chip microcomputer AT89C51.The device then calculates the scale values from serial corresponding values of the outputs of the VP broadband tiltmeter and a laser interferometer.This device could realize the automatic operation of calibration,and its relative calibration accuracy is 0.36% when the excitation voltage is adj usted to +8 V,and meets the requirement of a relative error of less than 1%.
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