| 摘要 |
PROBLEM TO BE SOLVED: To synchronize a plurality of probe means by performing the pattern- matching with a bit pattern line radio-received from a display means, and measuring an input signal by a sampling clock synchronized to the output. SOLUTION: A display means 50 transmits a predetermined bit pattern line to a probe means 52a. This is received and demodulated by an antenna 6a and a demodulating circuit 10a, an output signal 101 is outputted to a pattern matching circuit 12a to be pattern-matched with the bit pattern line, and an output signal 102 is outputted. A sampling clock generating circuit generates a sampling clock with the maximum output amplitude of the signal 102 as trigger. A control circuit 8a and an A/D converter 9a measure an input signal 100a on the basis of this clock and transmits the result to the means 50. The means 50 displays the measured waveform on a display circuit 2. A probe means 52b also operates in the same manner. According to this method, samplings of a plurality of means 52a, 52b can be synchronized. |
