EN-53Manual | TM3-Primus 4 | Instruments | 4.7 | Loudness Bar
EN
The three values selectable for the bargraph of the Loudness Sum instru-
ment show the following:
• M (Momentary): Summed momentary loudness measurements of the
individual channels using an integration time of 400 ms.
• S (Shortterm): Summed loudness measurement using an integration
time of 3 s and a sliding window.
• I (Integrated): Overall program loudness between start and end
points that are entered manually. Use the Start, Stop
and Reset Loudness buttons to execute this measu-
rement.
Two different scale types are available for loudness measurements:
• Absolute scale in LKFS or LUFS (depending on the loudness standard
selected).
• Relative scale in LU.
On the relative scale, 0 LU corresponds to their target level defi ned in the
selected loudness standard. In EBU R128, the target level is –23 LUFS.
In ATSC A/85, the target level is –24 LKFS. –23 LUFS is identical to –23
LKFS.
In order to conform to the individual loudness standard used, the mea-
sured program should read the „Integrated“ target level of this standard.
Using EBU R128, it should read 0 LU on a relative scale or –23 LUFS on
an absolute scale.
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