Recent versions of DSA815 Firmware and S1210 software improved the operation of the amplitude units in the software. These versions are:
Instrument Firmware – 00.01.19
1210 Software – 05.00.07
On occasion it is still possible to show a data offset due to changing units such as this:
This is usually caused by using the instrument from the front panel and setting the amplitude to dBuV manually. The software is expecting the instrument to be in default dBm before it runs. The best way to for data to be correctly processed is to hit the green PRESET button if you have been changing settings on the instrument between software runs.
With the factory preset active the data is correct in dBuV: