268 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
15 Measurements
Occupied Bandwidth
Occupied Band wid th measures the bandwidth (frequency range) containing some
percent (usually 99%) of the total spectral power. While 99% is the industry norm,
you can specify the percent you want to use in the measurement.
The center frequency used in the measurement is the one defined for the FFT
function, and the FFT span represents the total spectral power.
When this measurement is tracked with cursors, the cursors show the measured
bandwidth (frequency range).
Adjacent Channel Power Ratio (ACPR)
Adjacent Channel Power Ratio or just Adjacent Power Ratio (or channel leakage
ratio) measures the ratio of the power contained in one or more sidebands to the
power in the main frequency range.
The main range is specified by a channel width and a center frequency. The
Channel Width is one of the measurement's parameters. The center frequency
used in the measurement is the one defined for the FFT function.
Sidebands (with the same width as the main range) exist above and below the
main range separated by the channel spacing width. The Channel Spacing width
is another measurement parameter.
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