MEAS:POW:DC? starts a new measurement and then queries the DC power.
FETC:POW:DC? queries the DC power without starting a new measurement.
The valid modes (parameters to the OUTP:COUP command) are DC, ACDC, and EDC (PCR-M only).
Returns the DC power in NR3 format in response to MEAS:POW:DC? or FETC:POW:DC?.
In case of the single-phase three-wire output, MEAS:POW:DC? or FETC:POW:DC? returns a comma-separated list of the DC power <NR3> for U and V phases.