2201R Mobile Tester SCPI Reference Guide
Chapter 2 Remote control of the 2201R Mobile Tester
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Important notes:
•
A newly issued RF TX MEASure command terminates any RF TX or RF spectrum measurements currently in prog-
ress.
•
A newly issued RF SPectrum MEASure command terminates any RF TX or RF spectrum measurements currently
in progress.
•
A newly issued RF RX MEASure command terminates any RF RX measurements currently in progress.
•
A newly issued AF MEASure command terminates 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 2201R.
•
In case the 2201R is in a state that does not allow a specific measurement command to be performed or com-
pleted, an error message is added to the 2201R’s internal error queue. The related flag in
In case this is the first error message to appear within the error queue, the error indicator bit of the service regis-
ter (bit 2) is also set.
:MEASure[:CONTinuous]
MEASure commands that are stated with or without the optional
:CONTinuous
command element make the
2201R perform the related measurement for an unlimited number of times.
The measurement is only terminated if a new MEASure command of the same or related type is issued (see Notes
above).
Syntax
:MEASure[:CONTinuous]<{:measProp}>[?]
Parameters
The one-shot measurements do not require any parameters.
Description
Starts the (continuous) measurement of the specified measurable property.
The
CONTinuous
command element is optional.
Unless a measurement result is read out (using the
FETCh
subsystem), no measure-
ment result values are returned.
The measurement result(s) of any measurement are stored internally. Any previously
stored result is overwritten as soon as a new measurement result has been achieved.
The latest result measured may be read out using the FETCh subsystem.
Any FETCh command waits for a measurement result value(s) to be available. In case
there is more than one measurement result value, the single measurement result val-
ues are separated by commas (for example, “50.5,3.46”). Should the FETCh com-
mand fail to obtain a measurement result value (because for example the current
state of the 2201R does not allow the measurement to be performed or completed),
a timeout occurs and an error message is added to the 2201R’s internal error queue.
The related flag in the STATus subsystem is set too.
In case this is the first error message to appear within the error queue, the error indi-
cator bit of the service register (bit 2) is also set.
The main application of the combination of the MEAS and the FETC subsystems:
Starting a measurement that takes some time to deliver a measurement result back
(e.g. the BER measurement. After the measurement has been started with the MEAS
command, the test set ‘is free’ to perform other tasks. If in this case the query form of
the MEAS command is used, the test set is blocked until a measurement result is
available.
Sometimes, measurement results need to ‘sweep in’. In this case, the first measure-
ment result might be totally misleading. Using the
MEAS
command allows the mea-
surement result value to stabilize on a meaningful result before the latest result value
is read out using the
FETC
subsystem.