| 摘要 |
<p>Sampling pulses (B) for determining a series of measurement periods are each synchronized, by a synchronizing circuit (21), with one of input signal pulses (C) to be measured, and a first counter (27) responds to the synchronized sampling pulse (D) to start the counting of the input signal pulses (C). When the first counter (27) has counted a predetermined number M of input signal pulses (C), a second counter (34) starts the counting of the input signal pulses (C) at the initial value M and stops the counting in response to the next synchronized sampling pulse (B). The count value of the second counter (34) is applied to a display (41) during the next counting of the input signal pulses (C) by the first counter (27) up to the predetermined number (M).</p> |
