NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–CCTV Tester
Question: Why does the cable fault tester use the internal impedance balancing technique Answer: Why does the cable fault tester use the internal impedance balancing technique? I believe that users want to ask this question. Today, I will sort it out for you, let’s take a look. Impulse Question: Why Does Cable Fault Tester Use Internal Impedance Balancing Technique Answer: Why Does Cable Fault Tester Use Internal Impedance Balancing Technique? I believe that users want to ask this question. Today, I will sort it out for you, let’s take a look. The pulse sent by the pulse reflection instrument has a certain width. Due to the mismatch between the output impedance of the instrument and the wave impedance of the cable, the transmitted pulse obtained on the cable or felt by the receiving circuit of the instrument drags a tail, and the reflected pulse at the fault point overlaps with the transmitted pulse. , which will cause a significant measurement blind area; the instrument receives and displays the transmitted pulse and the reflected pulse on the display at the same time. When the fault point is far away, the amplitude of the transmitted pulse is much larger than the reflected pulse at the fault point. For example, by increasing the amplifier gain, to achieve The purpose of increasing the amplitude of the reflected pulse at the fault point will cause the saturation of the signal amplifying circuit, and the so-called so-called“block”Phenomenon.
The purpose of using internal impedance balance technology is to compress or even eliminate the transmitted pulse received (and displayed) by the instrument, thereby reducing or eliminating the measurement dead zone, and can maximize the gain of the amplifier circuit and increase the amplitude of the reflected pulse at the fault point. without making the amplifier circuit“block”Causes the pulse reflection waveform to be distorted. I hope that the above introduction about the cable fault tester can bring you some help. Thank you for reading. If you have any needs, please feel free to contact us.
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