Rion NA-42, Инструкция по эксплуатации

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Comparator
While comparator function is operating, the indication COMP is shown.
In the bar graph indication, the bar corresponding to the comparator refer-
ence level remains constantly on.
For example, when the comparator level is set to 75 dB, the 75 dB point on
the bar graph scale lights up.
Note
Set the comparator level between the upper limit of
the selected level range and -50 dB. If the comparator
level is set to a value outside of this range, correct
operation is not assured.
While the comparator function is ON, all con-
trols except the MENU (LIGHT) key, RESET key,
20 dB/50 dB key, and POWER switch are inactive.
COMP
Lit
Comparator level indicator bar
(This bar lights for comparator level 75 dB)
Actual sound pressure level is shown by bar graph