Spectrum Analyzer Measurements : Adjacent Channel Power
 
Adjacent Channel Power
Adjacent Channel Power (ACP) measurements are set up using the SETUP Menu (ACP).
ACP is a measure of the power that leaks into adjacent transmit channels. The ACP measurement measures the power present in the transmit channel (refer to Channel Power) along with the adjacent transmit channels that have been configured in the SETUP menu.
Adjacent Channel Power Ratio Measurement
1. Green integration bandwidth edge of lower alternate channels.
2. Red integration bandwidth edge of lower adjacent and alternate channels.
3. Blue integration bandwidth edge of lower main and adjacent channels.
Frequency and span settings for many signal standards can be set as follows:
1. Press MEASURE on the main menu.
2. Select ACP from the MEASUREMENT button.
3. Press SETUP and then adjust these settings:
• Channel spacing
• Main integration bandwidth
• Adjacent integration bandwidth
• Alternate integration bandwidth
• Limit testing
• Main channel limit
• Adjacent channel limit
• Alternate channel limit
ACP is a constant measurement; after it is turned on, it remains on until a different measurement is selected or the sweep is paused. ACP is calculated at the end of each sweep.
SETUP Menu (ACP)
The Adjacent Channel Power SETUP menu is available in MEASURE > MEASUREMENT > ACP > SETUP. After the ACP measurement is selected, the SETUP menu can be quickly accessed by tapping on the summary display area below the spectrum window.
SETUP Menu (ACP)

CHANNEL SPACING
Specifies the channel frequency spacing (center channel to center channel).
MAIN INTEG BW
Specifies the range of integration used in calculating the power within the channel. The integration bandwidth (IBW) is displayed as two vertical dashed lines for each channel.
ADJ INTEG BW
Specifies the range of integration bandwidth used in calculating the power in the adjacent channel.
ALT INTEG BW
Specifies the range of integration used in calculating the power in the alternate channel.
LIMIT TYPE
Selects Absolute or Relative for the limit evaluation.
LIMITS
Turns on or off the use of ACP limits.
MAIN CH LIMIT
Sets the main channel limit.
ADJ CH LIMIT
Sets the adjacent channel limit.
ALT CH LIMIT
Sets the alternate channel limit.
PRESET SETUP
Sets all ACP setup parameters to default. Turns off limits.