FCP Test Mode
The following sections describe the behavior of the FCP in test mode. For each streaming
mode of the FCP, the functionality of the test varies to account for the type of transmission
employed in the specific streaming mode.
There are two SCPI commands for FCP testing. One command to enable or disable the test
mode for FCP and a second command to print the related information on the active FCP
streaming mode and the testing of this mode.
Related SCPI Commands
[:SOURce]:FCPort:TEST OFF|ON|0|1
Sets the FCP to test mode.
*RST value: OFF
Figure 9: The FCP:TEST command dictates if the FCP is being run in test mode. Please note
that the behavior of the FCP test depends on the applied streaming mode at any given time.
[:SOURce]:FCPort:DIAGnostic
Gets diagnostic information regarding the FCP.
[:SOURce]:FCPort:DIAGnostic?
Prints the previously gathered diagnostic information of the FCP.
The displayed information varies according to streaming mode. When the FCP test mode is
activated, the test information and results are shown along with the diagnostic information
on the current FCP state.
FCP IQ Stream in Test Mode
The diagnostic information for the FCP relays the state of the received clock on FCP. For the
FCP to be able to sample the IQ data correctly in IQ streaming mode, the respective clock pin
must be driven with a stable clock signal with a 50% duty cycle. The FCP will only be able to
lock onto the clock signal if it is stable. Consult the FCP:DIAG SCPI command to check if your
applied clock signal meets these requirements. Please note that it is recommended to drive
this clock signal and the reference clock for the VSG with the same source clock to avoid
undesired frequency offset effects.
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