Appendix; Sharing The M9300A Frequency Reference - Keysight M9383A Startup Manual

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Appendix

The M9300A Frequency Reference module can be shared by multiple instruments.

If you connect to a hardware configuration that includes a currently connected

M9300A (either independently or as part of another hardware configuration) the

latest instance of the SFP will take control of the M9300A. You will see no warning

or error message.

Keysight M9383A PXIe Vector Signal Generator

While the M9300A module is being shared, any of the configurations that share

this reference can control it fully, including setting the reference to use an

external frequency reference source. If the external frequency reference setting

does not match that of the supplied frequency, the reference will be unlocked,

as expected. However, only the instance of the SFP that creates the reference

unlock condition can correct the problem. This is done by either correcting the

frequency or by setting the reference back to internal, so that a subsequent

instance will not take control of the reference module unintentionally.

The Reference module can also be shared among multiple measurement

applications, such as the Keysight 89600 VSA software. The Reference module

must be initialized before use, so including it in all configurations allows

applications to be started in any order. However, when sharing a module the

user interface of some applications may not reflect M9300A settings made by

other applications. For example, the Keysight 89600 software can control the

Reference module internal/external setting, but the changes made by other

applications will not be reflected in the Keysight 89600.

FPGA updates are not allowed on a Keysight M9300A PXIe Frequency

Reference while it is being shared. To perform M9300A FPGA updates, reserve

the Reference.

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