Agilent Technologies 8935 series e6380a Manual Do Utilizador

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

Overview of the Test Set’s Built-In Tools

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. 

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

• 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

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.