112 FieldFox User’s Guide
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 Integrating BW
Enter a value between 100 Hz and 100 MHz using the numeric keypad, ▲|▼
arrows, or the rotary knob.
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 Offsets
Press Offset 1 2 3 to select an offset.
Then Offset State to set that offset ON or OFF.
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.
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:
Press Limit 8
Then Offset (1,2,3)
Then choose from the following:
Lower Offset Sets a limit for the lower-frequency offset.
Upper Offset Sets a limit for the higher-frequency offset.
Then enter a value using the numeric keypad, ▲|▼ arrows, or the rotary knob.
Then Limit Test ON OFF
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.)
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