LEVEL MEASURING DEVICE

PURPOSE:To shorten the measurement time, by measuring a little earlier the waveform level than usual if the stabilizing time characteristic of a waveform has reproducibility. CONSTITUTION:A means which attains a pair of time data close to each other after stabilization of a waveform to be measured, a means which discriminates whether one waveform level is within a set limit value, a means which attains the inclination of the rise time of the waveform, and a means which repeats said measurement if the waveform level is not within the allowable limit are provided. When the measuring principle is indicated, waveform levels at points A and B are measured, and the inclination of the rise time is attained on a basis of the difference of waveform level between points A and B if the value at the point A is within the set limit, but discrimination of the inclination is judged to be terminated if it is not within the set limit. When discrimination is not terminated because values at points A and B are not within the limit, waveform levels at points C and D are measured similarly; and when discrimination is not terminated with points C and D, the final discrimination is performed only with a normal discrimination position E.