Rion NA-42, Instruction Manual

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6
Controls and Features
20 Hz key
Switches the high-pass fi lter (HPF) on and off. When the fi lter is on,
signal components below 20 Hz are sharply attenuated.
L
p
/L
max/
L
peak key
Switches the measurement mode to sound pressure level
L
p
, sound level
maximum
L
max
, or peak sound pressure level
L
peak
.
MENU (LIGHT) key
Pressing this key brings up the menu. Use the setting up/down keys to
make a selection.
Holding down the MENU (LIGHT) key for at least 2 seconds switches
the display backlight on or off. When the unit is running on batteries,
the backlight is automatically turned off after 10 minutes.
Switching power on while holding down the MENU (LIGHT) key calls
up the software version.
INPUT connector
The microphone preamplifi er is connected here. The sensitivity of the
unit must be adjusted to match the microphone sensitivity.
The connector is a 7-pin connector (TAJIMI ELECTRONICS CO., LTD.).
A: Preamplifi er power 12 V or +45 V
B: Ground
C: Signal input
D: Preamplifi er power supply -12 V or -45 V
E: 30 V DC Microphone bias voltage
(when preamplifi er gain is set to 20 dB)
Ground When preamplifi er gain is set to 0 dB
Calibration signal output When INSERT CAL is selected
F: 60 V DC Microphone bias voltage
G: 200 V DC Microphone bias voltage