| 摘要 |
PURPOSE:To make a sudden abnormal phenomenon apparent, and to analyze easily the abnormal phenomenon by adding variably the probe input impedance of a logic analyzer. CONSTITUTION:When detecting a factor for generating an abnormal phenomenon, a switch S is turned on, and set to a low impedance converting mode. As a result, it becomes a form which has connected in parallel a resistance and a capacity of a variable input impedance circuit 41 to an input resistance Rin and an input capacity C in of a comparator, and an input impedance of a logic probe 40 goes to low. When it is connected to a signal to be measured in this state, a load impedance seen from a circuit to be measured goes to low, and it attains a heavy load state to a usual logic circuit. As for a sudden phenomenon whose factor is a physical phenomenon (noise, etc.), the phenomenon appears more remarkably by the heavy load state, therefore, the abnormal phenomenon is made apparent, and the analysis can be advanced. |
