Measurement procedure and operating principle of DTF measurement

basic information

In this function, the TG output of the MSA438TG is distributed to the device under test cable and the RF input of the MSA438TG via a DTF adapter. If there is a fault point in the middle of the device under test cable, a reflection occurs there and returns to the DTF adapter. Half of the reflected signal reaches the RF input through the DTF adapter. The RF input will receive a composite signal made up of this reflected signal and the input from the TG output. This signal will interfere constructively and destructively in correspondence with the distance to the fault point and the frequency. As a result, peaks and valleys will continuously appear on the frequency axis, with the frequency corresponding to the distance to the fault point. When this frequency domain data is converted to time domain data using an inverse Fourier transform, the reflection from the fault point appears as a peak. By multiplying the appearance time of this peak by the propagation speed, the distance to the fault point can be obtained. In this function, the horizontal axis value of the marker indicates distance instead of the usual frequency. Therefore, by moving the marker to the peak, the distance to the fault point can be read directly. This function performs this series of processes for each sweep.

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Applications/Examples of results

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