Agilent Technologies 4294A, Руководство по программированию

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104 Chapter 7
Processing Measurement Results
Analyzing Measurement Results
Figure 7-2 Trace bandwidth analysis
Use the following command to read the results of trace bandwidth analysis.
• “OUTPMWID?” on page 390
You can use the following command to search for a measurement point that meets the
cutoff point requirements and that is located outside the cutoff point found during the
initial search.
• “WIDSOUT” on page 461
Use the following command to return to the initial cutoff point from the measurement point
found using the above command.
• “WIDSIN” on page 460
Example 7-3 shows a sample program for trace bandwidth analysis. This program is
available under the filename “band_ana.bas” on the sample program disk.
This program performs a sweep once, searches for the bandwidth, and reads and displays
the results of trace bandwidth analysis.
Lines 30 to 70 Identifies the external controller and Instrument BASIC and sets the
GPIB address.
Lines 90 to 110 Substitutes the sweep center value, the sweep span value, and the trace
selected as the active trace into the corresponding variables Cent,
Span, and Act_trc$, respectively.
Lines 130 to 160 Resets the Agilent 4294A, sets impedance amplitude and phase as
measurement parameters, and sets the sweep center value and the
sweep span value to Cent and Span, respectively.
Lines 170 to 190 Performs a sweep once and waits for the sweep to be completed.
Lines 210 to 220 Sets the active trace to Act_trc$ and executes the auto scale to
automatically set the scale parameters so that the waveforms fit on the
screen.