Introduction: The signal tracking source is actually a sweep signal generator with a constant output amplitude synchronized with the scanning reception frequency of the spectrum analyzer. The spectrum analyzer measures the signal amplitude changes at consecutive frequency points within a set frequency range by the receiver. The situation, to understand the transmission frequency response of the two-port network, spectrum tracking signal source function similar to the scanner and the standard network. If it is matched with the standing wave bridge, it can measure the reflection curve of a single port device, such as the antenna and the load, and determine the transmission matching impedance of the device.
Whether the spectrum analyzer is equipped with a tracking signal source is well-identified from the appearance of the instrument. Most of the analyzers with a built-in tracking signal source will have a high-frequency signal output port on the front panel marked with “GEN OUTPUT†or “RF OUTâ€. Attention must be paid to the self-checking signal ports provided by some spectrum analyzers. The school signal port is usually marked with a fixed frequency and output signal amplitude. The tracking signal source of the general spectrum analyzer is an option. The position of the tracking source output port will be left on the front panel of the instrument. If no tracking source is installed, it will be enclosed by a small cover.
The specific operation of using the spectrum analyzer to track the source function is to prepare two test cables and a connector capable of connecting the two cables together. One end of the test cable is connected to the trace source output and the signal input end of the spectrum analyzer, respectively. Connected to the input and output ports of the device under test.
Enter the tracking source working mode and set the tracking source parameters. The traditional CRT spectrum analyzer only has a fixed output amplitude and frequency. First set the output frequency range of the tracking source (same as the spectrum analyzer sweep frequency interval setting). There are two setting methods: “center frequency + span†and “start frequency + stop frequencyâ€.
Correct the measurement system by directly interconnecting the two test cables through the connector (equivalent to skipping the device under test and short-circuiting them directly). Perform the self-calibration procedure so that the instrument can correct the high-frequency insertions introduced by the test cable and the port connector. Loss caused by the error. Through the calibration operation, the test cable is integrated with the spectrum analyzer. The test port also extends from the front panel input/output port to the test cable port, and a horizontal straight line appears on the display screen (with the test cable shorted). Most traditional CRT analyzers do not support self-calibration operation. Uncorrected reference traces of the tracking source signal may be bent (fluctuating) or tilted (upturned or bent down), affecting the accuracy of the measurement. Disconnect the test cables that are shorted to each other and remove the connectors. Connect the two ends of the test cable to the input and output ports of the device under test. If the interface types do not match, use an adapter. The test frequency analyzer screen on the connection shows the frequency response curve of the device under test. For the band-pass filter to show a "convex" pattern, a trap type for a small duplexer shows a "v" or "concave" shape.
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