| 摘要 |
The apparatus fitted in a hand-portable test unit has means ( 1 ) for generating an electrical signal by modulating a relatively higher-frequency signal with a relatively low-frequency audio signal and means for injecting the signal into one end of a line. Superimposing the higher-frequency carrier frequency on the low-frequency audio frequency makes it possible to design the output capacitors ( 3.1, 3.2, 3.3, 3.4 ) to have a smaller capacitance, with the result that the dielectric strength of the device can be increased.
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