B&K Precision 2658A - Datasheet - Manual (Page 4)

Handheld Spectrum Analyzers, 3.3 GHz & 8.5 GHz
Models 2650A, 2652A & 2658A
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Max and Min Hold
Max Hold: At each displayed frequency, the
currently-measured value is compared to the
previously-measured value and the larger one is
retained and displayed. This feature is useful for
observing a bursted or intermittent signal or for
measuring the electric field strength of systems
using direct sequence spread spectrum/frequency
hopping modulation techniques.
Min hold: At each displayed frequency, the
currently-measured value is compared to the
previously-measured value and the smaller one is
retained and displayed.
In both cases, the number of sweeps can be set
to 2
N , where N is from 1 to 10 or infinite.
Calculation and Marker functions ▲
Averaging
The analyzer continuously sweeps, then
calculates and displays the average value over the
total number of sweeps. The number of sweeps
can be set to 2
N , where N is from 1 to 10.
Averaging is useful for detecting signals buried in
the noise floor because random noise is averaged
out.
Marker Function
Two different modes are available for marker
measurements:
■ Normal marker mode measures the
frequency and level of the marked point
■ Delta marker mode measures the frequency
and level differences between the two
markers (see image)
Overwrite
The results of each consecutive sweep are
displayed and the screen is not cleared after each
sweep. This lets you observe the long term
variations of a signal. Peak Function
Two different modes are available for peak
search:
■ Normal peak search mode searches for the
highest level on the screen. In this mode, you
can also use the NEXT button to locate the
marker on the next smaller peak.
■ In-zone peak search mode searches for the
peak level in the range specified by the center
value and width.
The picture shown demonstrates in-zone peak search.
Delta marker measurement