Dbu/0 Dbfs; Change References - RTW TM3-Primus Bedienungsanleitung

5.2 | dBu/0 dBFS

With this option the relation between the analog reference level and the
0 dBFS display when using a digital scale will be set. Using a reference
level setting of 15 dBu/0 dBFS on TM3-Primus means that an input level
of +6 dBu reads –9 dBFS on a TP60 scale for example. The relation can
be adjusted in steps of 0.1 dBu. This reference must be set correctly to
allow a Loudness measurement for analog sources. It has no impact on
digital source measurements.

5.3 | Change References

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Manual | TM3-Primus
EN-68 5 | Reference Level Adjust | 5.2 | dBu/0 dBFS