| 摘要 |
<p>The voltage source is loaded with an adjustable test current. The source (6) is loaded with n resistors (R1-R5) whose resistances are stepped. They are at certain time intervals connected in parallel with the source by n switches. Control inputs of the switches are connected to the counting outputs of an n-stage pulse counter (7). A null detector (8) applies, at each zero crossing of the source voltage, a pulse to the counter input (9). The load resistors (R1-R5) in each of which is in series with a thyristor switch (Th1-Th5) are arranged in a binary power scale.</p> |
