09 | Keysight | 89601B/BN-200 Basic Vector Signal Analysis, 89601B/BN-300 Hardware Connectivity, 89600 VSA Software - Technical Overview
Software Features
Basic VSA (Option 200)
Note: The following features are independent of hardware platform used, unless otherwise noted.
Time and waveform
Time record characteristics
In the 89600 VSA software, measurements are based on time records. A time record is a block
of samples of the signal waveform from which time, frequency, and modulation domain data is
derived.
Data mode
Zoom
Two signal processing modes, baseband and zoom, affect the appearance and the duration of input
waveforms displayed.
Measurements are made with non-zero start frequency. Time domain display shows a complex envelope
representation of the input signal, i.e. the magnitude and phase of the signal relative to the analyzer’s
center frequency.
Baseband
Measurements begin at 0 Hz. The input signal is directly digitized and the waveform display shows the
entire signal (carrier plus modulation), much as an oscilloscope would.
Time record length (main time)
Time sample resolution
(Number of frequency points – 1)
Span with RBW mode set to arbitrary, auto-coupled
1/(k x span)
Where:
k = 2.56 for time data mode set to baseband
k = 1.28 for all other modes (default) including zoom
Span = Currently selected frequency span
Time recording characteristics
In recording (time capture) mode the incoming waveform is captured gap-free into high-speed time
capture memory. This data may then be replayed at full or reduced speed, saved to mass storage, or
transferred to another software application.
When time analyzing the captured waveform, users may adjust measurement
span and center frequency in order to zoom in on a signal, as long as the new measurement span lies
entirely within the originally captured span.
Time recording memory size
Resolution bandwidth (RBW)
RBW values
Memory size is dependent on the hardware used. See hardware specifications for more information.
The range of available RBW choices is a function of the selected frequency span and the number of cal-
culated frequency points. Users may step through the available range in a 1-3-10 sequence or directly
enter an arbitrarily chosen bandwidth.
Range
< 1 Hz to > 0.287 x Max Span
RBW shape factor
The window choices below allow the user to optimize the RBW shape as needed for best amplitude ac-
curacy, best dynamic range, or best response to transient signal characteristics.
Selectivity
0.41
Passband flatness
0.01 dB
Rejection
> 95 dBc
> 125 dBc
> 31 dBc
> 13 dBc
> 92 dBc
> 89 dBc
> 73 dBc
Flat top
Gaussian top
Hanning
0.25
0.68 dB
0.11
1.5 dB
Uniform
0.0014
0.26
4.0 dB
Blackman-Harris
Kaiser-Bessel
Gaussian
0.83 dB
0.26
0.83 dB
0.22
0.83 dB
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