Adjacent Channel Power Ratio - Keysight N9912A User Manual

Frequency Span
Occupied BW is calculated from power that is measured over the entire displayed
Frequency Span. The frequency span can be entered using arbitrary frequencies or
by using a Radio Standard in conjunction with channel numbers. Learn how to select
a Radio Standard and channels on page 70.
To change Frequency Span:
 Press Freq/Dist
 Then
Freq Span
 Enter a value using the numeric keypad, ▲|▼ arrows, or the rotary knob.
 Press Enter
Power Percent
This setting specifies the percentage of total measured power to display between the
vertical posts. The measurement defaults to 99% of the occupied bandwidth power.
The remaining power (1% of default setting) is evenly distributed; .5% of the power
on the outside of each side of the vertical posts.
To change Power Percent:
 Press Meas Setup 4
 Then
Power Percent
 Enter a value between 10 and 99.99 using the numeric keypad, ▲|▼ arrows, or
the rotary knob.
 Press Enter.
Other Occupied Bandwidth Settings
All relevant FieldFox settings are made automatically to ensure the highest accuracy,
such as ResBW, VideoBW, and sweep (SwpAcquisition) speed. These, and all other
SA Mode settings, can be changed manually in a Occupied Bandwidth measurement.
 Learn about Measurement Preset on page 94.
 Learn about Averaging on page 94.
Adjacent Channel Power Ratio(ACPR)
ACPR measures the power of a carrier channel and the power in its adjacent (offset)
channels. The measurement results can help you determine whether the carrier
power is set correctly and whether the transmitter filter is working properly.
You can measure the channel power in one, two, or three adjacent (offset) channels
on the low frequency and high frequency side of the center channel.
Limits can be used to quickly see if too much power is measured in the adjacent
channels.
SA (Spectrum Analyzer) Mode 97