Phase Stable Cable bending phase stability test method introduction(3)

1.3 Reflection mode test method
This test method uses the reflection mode of the vector network analyzer to test the phase stable cable bending before and after the phase change. The test procedure uses only one port of the analyzer, and a short is connected to the specimen terminal. The total phase shift of the measured phase stable cable specimen consists of the phase shift of the signal from the analyzer to the specimen terminal and the phase shift of the signal from the terminal back to the analyzer, so the phase shift of the cable specimen should be half of the measured value.

As shown in Figure 3, the phase stable cable assembly under test is connected to the test port of the instrument, the other end of the assembly is connected to a short, the phase stable cable assembly is naturally straightened, the phase-frequency curve is measured, and zero calibration is performed. Keep the test connection state, the phase stable cable under test will be coiled 360° against the mandrel with the specified diameter D. The coiling action should be smooth to minimize the impact of improper action on the test results), the test curve will change, record the amount of change in the phase-frequency curve, the maximum value of change divided by 2 is the phase stable cable assembl phase change value.

This method is easy to operate, and also avoids the additional error brought by connector plugging and unplugging during the test, so it fully reflects its advantages and deserves further attention.

The test results of the three methods are close to each other, indicating that all three methods can basically meet the needs of the test. ZOMWAVE provide phase stable cable with high performance and low price, and can ship cables within 5 days. Click blue words and learn more.

Related Articles:

1. Phase Stable Cable bending phase stability test method introduction(1)

2. Phase Stable Cable bending phase stability test method introduction(2)