| 摘要 |
PURPOSE:To form a trigger signal with respect to an analogue input signal and a logic input signal by the same circuit, by comparing the logical data of the higher ranking bit of a digitally converted signal to be measured with the logical level given to a trigger generating condition. CONSTITUTION:A trigger generating circuit 1 has a bit selection circuit 7 and the digital conversion data of an analogue channel signal or a multichannel logic signal is changed over to be inputted to the circuit 7. In the circuit 7, the number of bits for setting a trigger condition are indicated with respect to the digital conversion data of the analogue signal by a number-of-bit setting circuit 5 and the number of channels for setting the trigger condition are indicated with respect to the logic signal. Subsequently, the output signal of the circuit 5 is inputted to a digital comparator 9 through a gate circuit 6 to be compared with the reference data of the trigger condition from a reference value setting circuit 8. The output signal of the comparator 9 is inputted to a trigger pulse forming circuit 10 to form a trigger pulse. As mentioned above, the trigger signal can be formed with respect to the analogue input signal and the logic input signal.
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