Agilent Technologies EPM-P Series Programming Manual page 558

UNIT Subsystem
UNIT[1]|2|3|4:POWer <amplitude_unit>
Example
UNIT1:POW DBM
Reset Condition
On reset, all windows/measurements are set to DBM.
14-4
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This command sets the power
measurement units for the upper
window/upper measurement.
EPM-P Series Power Meters Programming Guide