PBZ series offers a mode that combines the EXT SIG IN signal (an external signal source) with the internal signal source. You can set the offset using this mode.
To do so, go to the CONFIG setting and choose SIGNAL SOURCE > SELECT > ADD (INT+EXT).
Then, press the DC key to set the offset with the desired DC voltage.
For the details, read the user’s manual – chapter of Basic Features – Selecting a Signal Source – Signal Source Combinations.
