HP 34401A User Manual page 143

Chapter 4 Remote Interface Reference
The SCPI Status Model
The questionable data event register is cleared when:
You execute a *CLS (clear status) command.
You query the event register using STATus:QUEStionable:EVENt?.
The questionable data enable register is cleared when:
You turn on the power (*PSC does not apply).
You execute the STATus:PRESet command.
You execute the STATus:QUEStionable:ENABle 0 command.
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