3 VMA Mode
3.5 Channel Power Measurement
Remote Command
:INSTrument:COUPle:DEFault
Example
:INST:COUP:DEF
Backwards Compatibility
SCPI
:GLOBal:DEFault
3.5.9 Sweep
Accesses controls to configure and control the acquisition of data, and the X-axis
parameters of the instrument.
Depending on the selected mode and measurement, these controls might include:
Sweep Time, Continuous/Single, Pause/Resume, X Scale and Number of Points.
3.5.9.1 Sweep/Control
Accesses controls that let you operate the sweep and control functions of the
instrument, such as Sweep Time and Continuous/Single.
Sweep Time
Controls the time the instrument takes to sweep the current frequency span in
swept measurements, displays the sweep time in swept measurements, and
displays the equivalent Sweep Time in FFT measurements.
When Sweep Time is in Auto, the instrument computes a time that will give accurate
measurements based on other settings, such as RBW and VBW.
You can select a shorter sweep time to improve the measurement throughput (with
some potential unspecified accuracy reduction), but the Meas Uncal indicator will
appear if the sweep time you set is less than the calculated Auto Sweep time.
You can also select a longer sweep time, which can be useful (for example) for
obtaining accurate insertion loss measurements on very narrowband filters.
NOTE
Significantly faster sweep times are available with Option FS1.
NOTE
The Meas Uncal (measurement uncalibrated) warning is displayed in the Status
Bar at the bottom of the screen when the manual Sweep time entered is faster
than the time computed by the instrument’s Sweep time equations, that is, the
Auto Sweep Time. The instrument’s computed Sweep time will provide accurate
measurements; if you sweep faster than this your measurements may be
inaccurate. A Meas Uncal condition may be corrected by returning the Sweep
Time to Auto; by entering a longer Sweep Time; or by choosing a wider RBW
899 Vector Modulation Analyzer Mode User's &Programmer's Reference
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