Rion DA-21, Инструкция по эксплуатации

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Display Explanation
History display
Besides the bar graph format, the data display can also show a history graph
of waveform data absolute values. (This is not available in recall mode.) To
switch between the bar graph and history display, use the [>] or [<] key.
The data shown on the history display are the data of the monitor channel.
The horizontal axis is the time (up to 20 seconds before), and the vertical
axis is the level. Also during history display, you can switch the monitor
channel with the [ ]/[ ] keys.
(1) Channel information
From left, the display shows the voice memo, tacho, or marker icon (when
channel 5 is used), the channel number, and range full-scale.
(2) Time-level graph
The time-level graph shows a history graph for waveform data of the last
20 seconds in the monitor channel.
The graph is based on the approximate absolute (not the root mean
square) values of the input waveform.
(1) Channel information
(2) Time-level graph