Agilent Technologies EPM-P Series Programming Manual page 605

*OPC
The *OPC (OPeration Complete) command causes the power meter to set
the operation complete bit in the Standard Event Status Register when all
pending device operations have completed.
Syntax
*OPC
Query
*OPC?
The query places an ASCII 1 in the output queue when all pending device
operations have completed.
EPM-P Series Power Meters Programming Guide
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?
IEEE488.2 Command Reference
*OPC
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