| 摘要 |
<p>The atto-amperemeter comprises a sharp tip (1) connectable to a voltage source (18) providing a known potential (U1) via a sample conductor (17) the current (i) through which is to be measured, said tip (1) facing a particle detector such as an electron multiplier (4). The count of the free electrons being emitted from said tip (1), multiplied by said electron multiplier (4) and counted by an electronic counter (13), provides a measure of the current (i) passing through said sample conductor (17). Calibration of the arrangement is performed by temporarily connecting said tip (1) to ground and applying a calibration potential (Ucal) to a calibration electrode (3) aligned with said tip (1) and said channel electron multiplier (4).</p> |
