3 Short-Range Comms & IoT Mode
3.9 Occupied BW Measurement
3.9.10 Trace
Lets you control the acquisition, display, storage, detection and manipulation of
trace data for the available traces.
The "Trace Control" on page 1730 tab of this menu contains radio-button selections
for the trace type (Clear/Write, Trace Average, Max Hold, Min Hold) and View/Blank
setting for the selected trace.
A trace is a series of data points, each having an x and a y value. The x value is
frequency (or time, in zero span) and the y value is amplitude. Each data point is
referred to as a trace point. In any given trace, trace point 0 is the first point, and
trace point (sweep_points – 1) is the last. For example, in a 1001 point trace, the
first point is 0 and the last is 1000. Another term sometimes used to describe traces
is bucket. A bucket is the frequency span of a trace point, equal to the point spacing.
For swept analysis, the y value in each bucket is measured while the instrument is
sweeping across the bucket. The selected detector determines how it is measured.
When in Single Mode, Measurements and their Views save the trace data from the
last acquisition. This is true on multiple screens. The marker and trace data will be
present whenever the measurement is brought back into focus. The measurement
switches for these measurements do not clear the traces, so the data will be present
until the next acquisition is completed.
Invalid Data Indicator
The Invalid Data Indicator is displayed whenever the data on the display does not
match the settings of the instrument. The most common example of this is when
instrument settings have changed in the time since the data in the traces on the
display was taken. This means that the screen annotation cannot be guaranteed to
match the trace data. For example, if you change Center Frequency, the Invalid Data
Indicator will display until the trace has been retaken.
Short Range Comms & IoT Mode User's &Programmer's Reference 1327
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