53220A/53230A Measurements 3
Keysight 53220A/53230A User’s Guide 81
Prior to sending the command, SENSe:ROSCillator:SOURce EXTernal and
SENSe:ROSCillator:SOURce:AUTO OFF must be set.
The following example checks for an external reference signal applied to the Ext
Ref In connector.
SENS:ROSC:SOUR EXT // set source, also disables
// automatic source selection
SENS:ROSC:EXT:CHEC ONCE // check for valid signal
SYST:ERR? // read the error queue
The error queue can be read from the front panel as follows:
The status of the external reference (time base) is also monitored by the counter’s
Questionable Data register. The register can be queried with the command:
STATus:QUEStionable:EVENt?
A value of +1024 (bit 10) indicates an invalid frequency (time base) error. Reading
the register clears all bits in the register. See Chapter 8 for information on the
counter’s status system.
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