Agilent Technologies 8935 series e6380a manual Replot Data Files, Cable Fault Performance

Overview of theTest Set’s Built-In Tools

Using the RF Tools Program

Typical cable fault return loss measurements

Return loss is a ratio of input power to reflected power. For example, if 100 Watts was applied to a cable and 10 Watts was returned, the return loss is 10 dB (10 log(100/10)). In the same example, if 1 Watt was returned, the return loss is 20 dB (10 log(100/1)). Typical return loss measurements for the cable loss test are listed below:

•Open-Circuit Cable = 0 dB (ignoring line loss)

•Short-Circuit Cable = 0 dB (ignoring line loss)

•50-Ohm Terminated Cable = 40 to 60 dB

•Antenna = 10 to 20 dB (in the frequency band for which it was designed)

Return loss measurements greater than 20 dB should be considered good.

Cable Fault Performance

Measurements of the cable fault location can typically be made up to

500feet on low-loss cables and 300 feet on higher-loss cables.

Resolution of the fault location is approximately 0.4 feet for cable lengths up to 50 feet and then linearly increases to 4 feet for a 500 foot cable.

Specifications

•Cable Types Tested: Heliax, RG, Custom

•Cable Length Range: 0 to 1000 feet, 0 to 300 meters

•Distance accuracy: +/-5% of the cable length value entered by the user

Replot Data Files

This utility allows you to easily retrieve and display plots which were previously stored on an SRAM PC card. One or two plots may be displayed at one time. No measurements are performed.

102 Chapter 4

C:\Spk\Ref\RefGuideRevE\Tools.fm