Rion NA-42, Instruction Manual

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5
Controls and Features
FAST/SLOW/IMP key
Selects the time weighting characteristics. Available settings are FAST,
SLOW, and IMP (IMPULSE).
Sensitivity control
Serves to adjust the unit to match the microphone sensitivity.
20 kHz key
Switches the low-pass fi lter (LPF) on and off. When the fi lter is on, sig-
nal components above 20 kHz are sharply attenuated.
POWER switch
Turns the unit on and off.
EXT FILTER key
Switches an external fi lter on and off.
RESET key
The function of this key depends on the current operation mode of the
unit.
• When set to sound level maximum (
L
max
)
Resets the currently held measurement value.
• When set to peak sound pressure level (
L
peak
)
Resets the currently held measurement value.
• During remote operation via serial interface
Terminates remote operation and switches the unit to local
mode.
• When power is off
Switching power on while holding down the RESET key returns
the unit to the factory default settings (except for the setting of the
PREAMP power selector on the rear panel and the microphone
sensitivity setting).