ISO 16063-42

Description / Abstract: This part of ISO 16063 specifies the instrumentation and procedure to be used for the accurate calibration of seismometer sensitivity using local gravitational acceleration (local Earth's gravitation; local value for the acceleration due to the Earth's gravity) as a reference value.

It is intended generally to be applied to a servo-type accelerometer with/without a velocity output, which usually has a mass position output in the category of a wide-band seismometer with a bandwidth from 0,003 Hz to 100 Hz.

The method specified enables the user to obtain static sensitivity for the seismometers up to 10−⁵ m/s² (which corresponds to 1 mGal and approximately 1 ppm of the gravitational acceleration).

The combined and expanded (k = 2) uncertainty of applied acceleration achieved by this method is 10−⁶ m/s² (0,1 mGal). When the absolute gravimeter described in this part of ISO 16063 is used, the uncertainty of applied acceleration can be suppressed to 5 × 10−⁸ m/s² (5 μGal). The relative expanded uncertainty of calibration, excluding the uncertainty due to the device under test (DUT), is 0,5 %.

The intended end-usage of the seismometer to be applied is as follows:

a) measurement and observation for the earth science including geophysics usage;

b) measurement and observation for disaster prevention, such as detecting the precursor of a land slide;

c) diagnosis for the soundness of a building structure and foundation soil in civil engineering

d) observation for nuclear-test detection.