The Standard event register is cleared when:
You execute the *CLS (clear status) command.
You query the event register using the *ESR? command.
The Standard Event enable register is cleared when:
You execute the *ESE 0 command.
You turn the power on and have previously configured the
instrument to clear the enable register using the *PSC 1 command.
Note that the enable register will not be cleared at power-on if you
have configured the instrument using the *PSC 0 command.
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Chapter 5 Remote Interface Reference
The SCPI Status System
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