Agilent Technologies Signal Analyzer N9030a - Manual (Page 647)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Input/Output
State Saved Not saved in instrument state
Readback Normal|Stop Acq
Initial S/W Revision A.02.00
External Ref Coupling
Only appears with option ERC installed and licensed.
This function lets you couple the sweep system of the analyzer to the state of the External
Reference. If Normal is selected, data acquisition proceeds regardless of the state of the External
Reference. When you select Ext Ref Out Of Range Stops Acquisition, the data acquisition (sweep or
measurement) stops when either the "521, External ref out of range" or the "503, Frequency
Reference unlocked” error message is asserted. Note that this will only take place if the Freq Ref In
selection is External.
With the acquisition stopped, the data display will stop updating (even if this occurs in the
middle of a sweep or measurement) and no data will be returned to a READ? or MEASure? query;
that is, these queries will not complete because the analyzer will not respond to them.
Furthermore, no response will be generated to a *WAI? or *OPC? query.
Proper SCPI sequences are shown below, which will always fail to return if the acquisition stops
during the requested sweep or measurement. Note that, for predictable operation of this function,
it is best to operate the analyzer in single measurement mode (INIT:CONT OFF), because if
operating in continuous mode, the analyzer may respond to the above queries even after the
acquisition stops, with data left over from the previous acquisition.
:INIT:CONT OFF
:INIT:IMM;*OPC?
--
:INIT:CONT OFF
:INIT:IMM;*WAI?
--
:INIT:CONT OFF
:READ?
--
:INIT:CONT OFF
:MEASure?
Remote Language Compatibility Measurement Application Reference 647