| 摘要 |
A balance, which is virtually insensitive to angular deviation and to the presence of additional accelerations of the base, has two dynamometers (2, 3) each having a parallel guide (26). The parallel guides are mutually parallel and their degree of freedom coincides with the direction of gravitational acceleration when the balance is horizontal. The dynamometer (2) messures the weight (M) of the object to be weighed, and the dynamometer (3) measures that of a reference mass (8, 22, 24). The balance also has a computer (4) which, from the signals emitted by the two dynamometers (2, 3), accurately determines the mass of the object to be weighedindependently of the angular deviation of the instantaneous total acceleration. During calibration, which can be carried out only by the manufacturer, the dynamometer (3) determines the weight (R1, R2) of the reference mass (8, 22, 24) at two different inclinations of the balance, and the dynamometer (2) determines the weight (N1, N2) of the empty balance pan (18) and the total weight (M1, M2) using a known standard mass. After appropriate processing, the above-mentioned values and the parameters (s, S1, P, Q, R1, N1) derived therefrom are stored in the read-only memory (30) of the computer (4). The true mass is then determined from the instantaneous values of the weights (M, R) and the stored quantites. |
