3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
If the instrument is set for Continuous measurement, it sets up the measurement
and initiates a new data measurement sequence with a new data acquisition
(sweep) taken once the trigger condition is met.
If the instrument is set for Single measurement, it remains in the "idle" state until an
:INIT:IMM command is received.
Remote Command
:ABORt
Example
:ABOR
Notes If :INIT:CONT is ON, then a new continuous measurement will start immediately, with sweep (data
acquisition) occurring once the trigger condition has been met
If :INIT:CONT is OFF, then :INIT:IMM is used to start a single measurement, with sweep (data
acquisition) occurring once the trigger condition has been met
Dependencies For continuous measurement, :ABORt is equivalent to the Restart key
Not all measurements support this command
Status Bits/OPC
dependencies
The STATus:OPERation register bits 0 through 8 are cleared , except bit 6 (Waiting for Periodic
Sync). Initiating a measurement and Waiting for Periodic Sync could be asynchronous
The STATus:QUEStionable register bit 9 (INTegrity sum) is cleared
Since all the bits that feed into OPC are cleared by :ABORt, the Abort command will cause the *OPC
query to return true
3.2.10 Trace
This menu lets you control the acquisition, display, storage, detection and
manipulation of trace data for the available traces. The Trace Control 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. How it is measured depends on which detector is
selected.
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 are
present whenever the measurement is brought back into focus. The measurement
switches for these measurements do not clear the traces, so the data is present until
the next acquisition is completed.
506 Spectrum Analyzer Mode User's &Programmer's Reference
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