The bandwidth limit test function can be used for testing bandwidth for the band-pass filters.
The bandwidth test find the peak of a signal in the passband and locates a point on each side of the passband at an amplitude below the peak specified in test setup. The frequency between these two points is the bandwidth of the filter. Then, the obtained bandwidth is compared to minimum and maximum allowable bandwidth that you specify beforehand.
The test result for the trace will be indicated as Pass, Wide or Narrow in the upper-left area of the graph by following BWn. "n" denotes the trace number. You can also display the bandwidth value. If a trace is unsatisfactory, test results and bandwidth markers are displayed by red color.
The Global Pass/Fail setting in the limit tab is applied to bandwidth limit test. It will be judged as failed if one or more unsatisfactory trace exists in any of the bandwidth test within the channel.
You must set up the bandwidth threshold and the upper and lower limits before you can use the bandwidth limit test function. You can specify the threshold, upper limit and lower limit for each trace.
How to set Bandwidth Limit Setup |
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Using Hardkey/SoftTab/Softkey |
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Bandwidth Test Setup Dialog Box Help |
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Bandwidth Test Bandwidth Test ON - Check the box to set the bandwidth limit test ON or OFF. Bandwidth Marker ON - Check the box to make the bandwidth marker visible on the screen (Test still runs even though the bandwidth marker does not turns on). Sound ON Fail - Check the box to turn ON when the bandwidth limit test is FAIL. Target Bandwidth N dB Points - Specify the bandwidth threshold in dB unit. Min Bandwidth - Enter the lower limit for the bandwidth in Hz unit. Max Bandwidth - Enter the upper limit for the bandwidth in Hz unit. Note: If the data format is Smith chart or polar, the test is skipped. |
