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Getting the Best Speed Performance
This section discusses the factors that influence the speed of operation (number of
readings/sec) of the U2040 X-Series.
The following factors are those which have the greatest effect upon measurement speed (in
no particular order):
– The selected measurement rate (NORMal, DOUBle, FAST).
– The trigger mode (for example, free run, trigger with delay, etc.).
– The output format (ASCii or REAL).
– The units used for the measurement.
– The command used to take a measurement.
– The aperture size (SENS:SWE:APER) in the AVERage path.
In addition, there are other influences in the FAST mode which are described in "Fast
mode" on page 53.
The following paragraphs give a brief description of the above factors and how they are
controlled from SCPI.
Measurement rate
There are three possible speed settings: NORMal, DOUBle, and FAST. These are set using
the [:SENSe[1]:]MRATe command.
In the NORMal and DOUBle modes, full instrument functionality is available, but in the
FAST mode, limits and ratio/difference math functions are disabled.
Refer to the specifications in the U2040 X-Series User's Guide to determine the influence of
these speed settings on the accuracy and noise performance of the U2040 X-Series.
Trigger mode
The U2040 X-Series has a very flexible triggering system. For simplicity, it can be described
as having three modes:
– Free Run: When the U2040 X-Series is in the Free Run mode, it continuously takes
measurements. A measurement is in free run when INITiate:CONTinuous is set to
ON and TRIGger:SOURce is set to IMMediate.
– Triggered Free Run: When the U2040 X-Series is in the Triggered Free Run or
Continuous Trigger mode, it takes a new measurement each time a trigger event is
detected. A measurement is in triggered free run or continuous trigger when
INITiate:CONTinuous is set to ON and TRIGger:SOURce is not set to
IMMediate.
Keysight U2040 X-Series Programming Guide
U2040 X-Series Remote Operation
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