| 摘要 |
PURPOSE:To execute easily a discrimination which is suitable for a practical use by detecting a discontinuity to frequency. CONSTITUTION:A signal which is subjected to a frequency sweep at a constant speed through a sweep oscillator 1 of a constant level output by a feedback control, an isolator 7, etc. is impressed to a transistor 8 to be inspected. Subsequently, an output amplified by the transistor 8 is detected by a detector 12, and thereafter, processed by a differentiating circuit 13. As a result, in case when the transistor 8 is ill-balanced, a discontinuity is generated in a frequency characteristic, a pulse corresponding to a sudden variation following said scontinuity is generated from the circuit 13, and a generated pulse is counted by a counter 14, by which it is possible to execute easily a decision which is suitable for a practical use as to whether a high frequency balance of the transistor is good or not.
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