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126 Chapter 4
Making Measurements
Making the Adjacent Channel Power (ACP) Measurement
Data Points - The automatic mode chooses the optimum number
of points for the fastest measurement time with acceptable
repeatability. The minimum number of points that could be
used is determined by the sweep time and the sampling rate.
You can increase the length of the measured time record
(capture more of the burst) by increasing the number of points,
but the measurement will take longer.
Res BW - This key is always grayed out. However, it allows you
to see the resolution bandwidth that is derived from the
combination of sweep time, data points, and FFT segments.
Num FFT Seg - Allows you to select the number of FFT
segments used in making the measurement of the reference
channel (carrier). In automatic mode the measurement
optimizes the number of FFT segments required for the
shortest measurement time. The minimum number of
segments required to make a measurement is set by your
desired measurement bandwidth. Selecting more than the
minimum number of segments will give you more dynamic
range for making the measurement, but the measurement will
take longer to execute.
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Offset/Limits - Allows you to access the menu to change the following
parameters for offset frequency settings and pass/fail tests:
Offset - Allows you to select one of five offsets (A through E). Only
one selection at a time (A, B, C, D, or E) is shown on this key label.
The remaining softkeys on the
Offset/Limits menu then apply to the
selected offset.
Offset Freq- Allows you to enter an offset frequency value and
toggle the offset frequency function between
On and Off. The
range is 0.0 Hz to 45.000 MHz. While this key is activated, enter
an offset value from the numeric keypad by terminating with one
of the frequency unit keys shown. Offsets A and B are defaulted
as follows, while others are defaulted to 0.0 Hz:
Offset A 750.000 kHz
Offset B 1.98000 MHz
One offset frequency value corresponding to the
Offset key
selection is shown on this key label.
Offset Side - Choose Neg (negative) or Pos (positive) to have
single-sided offsets relative to the carrier, or
Both (the default) to
have offset frequency pairs.
Ref BW - Allows you to enter a reference bandwidth ranging from
300 Hz to 20.0000 MHz with the best resolution of 1 Hz. When
this parameter is changed, the integration bandwidth
Integ BW
in the summary data window changes to that value.