Keysight N9912A User Manual page 99

Integration Bandwidth
The Integration Bandwidth of the carrier and offsets is the frequency span over which
power is measured.
To change Integration Bandwidth:
 Press Meas Setup 4
 Then
 Enter a value between 100 Hz and 100 MHz using the numeric keypad, ▲|▼
 Press Enter
How to define adjacent (Offset) channels
An offset represents a range of frequencies over which power is measured. You can
specify up to three offsets. 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.
 Press Meas Setup 4
 Then
 Press
 Then
 Select
 Select
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:
 Press Limit 8
 Then
 Then choose from the following:


 Then enter a value using the numeric keypad, ▲|▼ arrows, or the rotary knob.
 Then
Measurement Type
This setting determines how the measured carrier and offset power levels in the table
are presented. (Data in the graphical chart is always presented in dBm for the carrier
and dBc for the offsets.)
To select Meas Type:
SA (Spectrum Analyzer) Mode
Integrating BW
arrows, or the rotary knob.
Offsets
to select an offset.
Offset 1 2 3
to set that offset ON or OFF.
Offset State
This is the difference between the carrier center frequency and
Offset Freq
the center frequency of the offset channel. Then enter a value using the numeric
keypad.
Offset Integ BW
in that offset; half of the range below and half above the Offset Freq.
Set Limits (1,2, or 3)
Sets a limit for the lower-frequency offset.
Lower Offset
Sets a limit for the higher-frequency offset.
Upper Offset
Limit Test ON OFF
This is the frequency range over which power is measured
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