HP 83751A User Manual page 186

Special Functions
This function allows you to offset the VOLTS/GHZ OUTPUT on the rear panel.
The acceptable range of values for this function is - 10 to + 10 V, with the
factory preset value being 0.00 V. The rear panel output is limited to a k12 V
range.
CORRection:VOLTs:OFFSet <nun>
15-16
Associated SCPI Commands
Sets the V/GHz offset to the desired
value.