MSRA basics
R&S
®
FSWP-B1
26
User Manual 1177.5862.02 ─ 09
not restricted, but you are informed about the violation of possible restrictions by error
messages in the status bar of the secondary applications where necessary.
5.2
Data acquisition
As mentioned before, only the MSRA primary performs a data acquisition. Thus, the
MSRA primary defines the center frequency, sample rate and record length of the cap-
tured I/Q data. It also defines the trigger event, thus all secondary applications have
the same trigger. However, an offset from the trigger can be defined by the individual
secondary applications (see
"Trigger offset vs. capture offset"
Performing sweeps
When you switch to MSRA mode, the Sequencer is automatically activated in continu-
ous mode. The MSRA primary continuously performs a data acquisition. If any secon-
dary applications are activated, then after each measurement, the data in the active
secondary applications is evaluated one after the other. The MSRA primary will then
repeat the data acquisition and evaluate the new data etc. The channel displays are
updated after each measurement or evaluation.
Alternatively, you can perform measurements manually. You can start a single or con-
tinuous sweep from any secondary application, which updates the data in the capture
buffer and the results in the current secondary application. The results in the other sec-
ondary applications, however, remain unchanged. You must refresh them manually,
either individually or all at once, using a
"Refresh"
function.
Note that in
continuous sweep mode
, sweeping is aborted when you switch to a dif-
ferent secondary application. You can then continue sweeping from there. This is nec-
essary in order to evaluate the same data in different secondary applications without
overwriting the data in the capture buffer.
In
single sweep mode
, only one sweep is performed; a sweep count is not available -
neither for the MSRA primary, nor for the secondary applications. However, depending
on the secondary application, a statistics count may be available for statistics based on
a single data acquisition. Trace averaging is performed as usual for sweep count = 0,
the current trace is averaged with the previously stored averaged trace.
Data availability
The secondary applications can only receive data that is available in the capture buffer.
As soon as data has been stored to the capture buffer successfully, a status bit (#9) in
the
STAT:OPER
register is set. If the required secondary application data is not availa-
ble, an error message is displayed. Details on restrictions are described in
"Restrictions for secondary applications"
Data acquisition