Chapter 7 SCPI
The Measurement subsystems
238 WCDMA Options Version 6.20
Example:
First a BER measurement command is issued to start a BER measurement
(because it takes some time).
Then several RF TX measurements are performed and the measurement results
are read out and used for statistic data evaluation.
After that the result of the BER measurement is read out.
Important notes:
– A newly issued RF TX MEASure command will terminate any RF TX or RF
spectrum measurements currently in progress.
– A newly issued RF SPectrum MEASure command will terminate any RF TX or
RF spectrum measurements currently in progress.
– A newly issued RF RX MEASure command will terminate any RF RX measure-
ments currently in progress.
– A newly issued AF MEASure command will terminate any RF TX, RF RX, RF
spectrum or AF measurements currently in progress.
– Measurements are always started, using the current system parameters and
the current state of the 4400.
– In case the 4400 is in a state that does not allow a specific measurement
command to be performed or completed, an error message will be added to
the 4400’s internal error queue. The related flag in The STATus subsystem
will be set, too.
In case this is the first error message to appear within the error queue, the
error indicator bit of the service register (bit 2) will be set as well.
Type of
measure-
ment
Related
command
element
Short description
One-shot [:CONTinuous] Actually
:CONT starts a measurement,
that will be performed continuously.
Single measurement results can be read
out using the related :FETCh com-
mands.
Thus several measurements can be
started (where those measurements are
started first that take the longest time,
like e.g. BER).
Series :ARRay This command element offers the possi-
bility to carry through a specific mea-
surement a certain number of times. All
the single measurement result values
can be read out with just one command.
Using this feature, measurement results
returned can then be used e.g. for sta-
tistic data evaluation on an external
computer.
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