G E T T I N G S T A R T E D
stop frequencies to fall outside the range of operation. Using the arrows, you can change
the span using a 1/2/5/10 sequence.
Center – allows you to change the center frequency of the sweep. If a change in center
frequency causes the start or stop frequencies to fall outside the range of operation, the span
will be reduced. Using the arrows, you can change the center frequency by step amount.
Start/Stop – allows you to change the start and stop frequency of the device. Frequencies
chosen outside the range of operation (9 kHz – 6.4 GHz) are clamped.
Step – allows you to change the step size of the up and down arrows on center frequency.
Full Span – This will change the start, stop, center, and span frequencies to select the
largest span possible.
Zero Span – Enter Zero-Span mode, using the current center frequency as the starting
center frequency for zero-span captures.
Amplitude Controls 3.2.2.2
Ref Level – Changing the reference level sets the power level of the top graticule line. The
units you select here will change which units are displayed throughout the entire system.
When automatic gain and attenuation are set(default), you can expect to make
measurements up to the reference level. Using the arrows you can change the reference
level by the dB/div amount.
dB/div – sets the scale for the y-axis. It may be set to any positive value. The chosen value
represents the vertical height of one square on the graticule.
o In linear mode, the dB/div control is not used, and the height of one square on the
graticule is 1/10
th
of the reference level.
Atten – sets the internal electronic attenuator. By default the attenuation is set to
automatic. It is recommended to set the attenuation to automatic so that the device can
best optimize for dynamic range and compression when making measurements.
Gain – Gain is used to control the input RF level. With this control you can have the gain
determined automatically or choose 4 levels of gain. Higher gains increase RF levels. When
gain is set to automatic, a best gain is chosen based on reference level. Manual gain settings
may cause the signal to clip well below the reference level, and should be used by
experienced BB60 users only.
Bandwidth Controls 3.2.2.3
Native RBW – When Native RBW is enabled, the device uses the Nutall window function.
When disable, a custom flat-top window function is used. The custom flat-top window
allows all possible RBW values to be set, while Native RBWs only allow a certain subset of
RBWs. The flat-top window will increase absolute amplitude accuracy.
RBW – This controls the resolution bandwidth (RBW). For each span a range of RBWs
may be used. The RBW controls the FFT size and signal processing, similar to selecting the
IF bandpass filters on an analog spectrum analyzer. The selectable bandwidths displayed
change whether you want native or non-native bandwidths.
o Native resolution bandwidths are available from below 1 Hz to 10.1 MHz, in
powers of two. Use the arrow buttons to move through the selectable RBWs.
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