Keysight N9915-90020 User’s Guide 227
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
Channel Measurements
Frequency Range/Channel
When a Radio Standard is selected, the appropriate center frequency or
channel and span is set automatically. The frequency or channel number can
then be changed from the Freq/Dist
menu. Learn how to select a Radio
Standard and channels in
“Radio Standard” on page 155.
The frequency range of an ACPR measurement can also be entered using
arbitrary frequencies.
When a Radio Standard is NOT selected, the center frequency of a previous
measurement is maintained when ACPR is selected.
Changing the Integration Bandwidth
The Integration Bandwidth of the carrier and offsets is the frequency span over
which power is measured.
To change Integration Bandwidth:
1. Press Meas Setup 4 > Integrating BW
2. Enter a value between 100 Hz and 100 MHz using the numeric keypad,
arrows, or the rotary knob.
3. Press Enter
How to define adjacent (Offset) channels
An offset represents a difference in center frequencies of the carrier channel
and its adjacent channel to be measured. The frequency range for each offset
is specified with an Offset Freq and Integ BW. Each offset that is created has a
Lower (carrier MINUS Offset Freq) and Upper (carrier PLUS Offset Freq) set of
frequencies.
1. Press Meas Setup 4
> Offsets
2. Press
Offset 1 2 3 to select an offset.
3. Then
Offset State to set that offset ON or OFF.
4. Select Offset Freq This is the difference between the carrier center
frequency and the center frequency of the offset channel. Then enter a
value using the numeric keypad.
5. Select Offset Integ BW This is the frequency range over which power is
measured in that offset; half of the range below and half above the Offset
Freq.
How to set limits for adjacent channels
You can set a unique threshold power for each of the offsets that will cause a
FAIL indication (RED bar). This occurs when the calculated dBc power (on top
of the offset bar) is ABOVE the specified level.
To set limits, with an ACPR measurement on the screen:
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