ACP Summary Table (Markers)

The ACP Adjacent Channel Power: The power from a modulated communications channel that leaks into an adjacent channel. This leakage is usually specified as a ratio to the power in the main channel, but is sometimes an absolute power. marker function provides an ACP Summary trace data result. The ACP Summary results are derived from the corresponding ACP marker measurement trace data results. There is a specific ACP Summary table result for each ACP marker trace.

The ACP Summary table trace data only applies to trace displays with spectrum data results and ACP marker selected.

To show the ACP Summary Table

To show the ACP Summary table trace data, select the ACP Summary trace data that corresponds to the same trace that shows the ACP marker measurement results. For example, if the ACP marker data were shown in Trace D, you would make any one of the available trace displays active and then open the ACP Summary trace D trace data result [Trace > Data > Marker > Trace D > ACP Summary]. To learn how to use the ACP Summary table, see Making an ACP Measurement.

Averaging

The ACP Summary Table always shows ACP results calculated from the current data of the spectrum trace containing the ACP marker.

Averaged ACP results can be obtained by enabling averaging and placing the ACP marker on an averaged Spectrum trace. When this is done, the ACP Summary Table will show values calculated from the averaged trace.

Data Results

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The ACP Summary table provides these data results:

Reference Bandwidth [Hz]: The measurement reference channel bandwidth.
Reference Alpha: The reference channel alpha for the Root Raised Cosine shape applied to the reference marker. The result is "xxx" if the RRC Shape checkbox is cleared.
Reference Power [dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer]: Total power in the reference channel.
Offset [Hz]: Adjacent Channel offset frequency.
BW [Hz]: Adjacent Channel bandwidth.
Alpha: Adjacent Channel alpha for the Root Raised Cosine shape applied to the adjacent channel marker. The result is "xxx" if the RRC Shape checkbox or the adjacent channel Alpha checkbox is cleared.
Lower Pwr [dBm]: Total power for the Lower Adjacent Channel (ACP).
Lower ACPR [dB]: Adjacent channel power for the Lower Adjacent Channel.
Upper Pwr [dBm]: Total power for the Upper Adjacent Channel (ACP).
Upper ACPR [dB]: Adjacent channel power for the Upper Adjacent Channel.
Max ACPR [dB]: Maximum ACP between the Lower and Upper Adjacent Channels.

Status Messages

There are 3 adjacent channel measurement status messages:

single asterisk *	The channel is partially off the trace display. The entire channel BW is not shown in the display and the measurement results will not represent the entire channel.
double asterisk **	The channel is totally off the trace display. You have an adjacent channel selected that is off the trace display and the measurement results cannot be computed.
triple asterisk ***	Disabled. This adjacent channel is not included in the measurement.

Querying summary table data results programmatically

To programmatically query the Trace Summary Table data results using the Summary() and SummaryUnit() methods in the MeasurementData object.

See the How To Query Summary Table Data Results topic for more information.