| 摘要 |
<p>PURPOSE:To attain accurate immunity test while making communication over a wide band by providing a cable acting as a distributed constant circuit and a longitudinal impedance stabilizing means. CONSTITUTION:This immunity test circuit is constituted of an electromagnetic clamp 14, a test voltage generator 15 applying a voltage to a communication channel 13 via the electromagnetic clamp 14, a cable 14 installed between the electromagnetic clamp 14 and a communication equipment 12 and used as a distributed constant circuit, a capacitor 17, a resistor 18, a capacitor 19 and a resistor 20 inserted in series between each core wire and ground at both ends of the cable 16 respectively. The cable 16 is used to make the longitudinal impedance of the communication line 13 stable by means of the distributed constant circuit and the resistances of the resistors 18, 20 suppress the resonance of the cable 16 and are set to the values where longitudinal impedance is made stable. Thus, the immunity test with excellent reproducibility over a wide frequency band is attained.</p> |
