ANSI EIA 00364-106-2000 pdf download Standing Wave Ratio (SWR) Test Procedure for Electrical Connectors
1 Introduction
1.1 Scope
This standard establishes test methods to evaluate existing standing wave ratio (SWR) of connectors, coaxial, radio frequency (RF). Measured SWR shall not exceed that specified over the frequency range specified.
2 Test resources
2.1 Equipment
2.1.1 Swept RF source.
2.1.2 Isolating devices, two.
2.1.3 RF sampling device with frequency-amplitude characteristics matched to the second radio frequency sampling device, see 2.1.4, to within 0.5 dB.
2.1.4 RF sampling device with precision hermaphroditic output connector. Residual SWR < 1.006 + 0.003f (f in GHz). 2.1.5 Standard precision adapter, maximum SWR 2.1.6 Detectors, two 2.1.7 Amplifiers, two 2.1.8 X-Y display 2.1.9 Cable simulator termination 2.1.10 Selected test cable 2.1.11 Precision hermaphroditic cable connector 2.1.12 Precision hermaphroditic termination 2.1.13 Standard precision adapters 2.1.14 Selected long cable whose attenuation is 26 dB minimum at lowest test frequency, or as specified. 3 Test specimen 3.1 Description Specimen shall consist of a connector with attached cable. 3.2 Preparation The wired specimen shall not be cleaned, unless otherwise specified in the referencing document. 4 Test procedure The SWR shall be measured in accordance with the following procedure. Diagrams for the swept frequency SWR system check out and measurement procedures are shown in figure 1. 4.1 Basic measurement setup In the basic measurement setup of figure 1, detector 1 provides a feedback signal to the swept RF source in order to normalize the output signal of detector 2. The frequency-amplitude characteristics of detectors 1 and 2 shall be matched within 0.5 dB. 4.2 SWR measurement 4.2.1 Slotted line technique Ten or more sweeps are made with the radio frequency probe repositioned in equal increments over at least a half wavelength at the lowest frequency of the band being swept. In this manner an X-Y display is generated whose upper and lower envelope limits represent maximum and minimum amplitudes of the standing wave for each frequency in the test band. 4.2.2 Frequency reflectometer / RF bridge technique A single sweep shall be made using sufficient RF power to provide as X-Y display less than 80 percent and/or, if possible, greater than 20 percent of full scale.