Norsonic nor1256, Instruction Manual

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6 Nor1256
Sound Calibrator
• Place the reference microphone in the coupler and
select the appropriate frequency.
• Press the calibrator button for about one second
until the display starts blinking and the LED turns
red. The calibrator button is accessible through a
small hole in the left-hand side of the enclosure.
Use a small rod with a diameter of about 1 mm.
• While the display is blinking, press
Hz
to increase
the level or
dB
to reduce the sound pressure level.
The level is changed in step of about 0,02 dB.
Warning!
Never enter the calibration mode without
access to reliable references.
• While the display is blinking, press Hz to increase
the reading or dB to reduce the reading.
• When the correct value is displayed, press °C/°F
and the value for air pressure start to blink.
• While the display is blinking, press
Hz
to increase
the reading or
dB
to reduce the reading.
• When the correct value is displayed, press °C/°F
and the value for humidity start to blink.
• While the display is blinking, press Hz to increase
the reading or dB to reduce the reading.
• When the correct value for humidity is displayed,
press °C/°F and the calibration mode is terminated
and the instrument returns to normal mode of
operation.
• When the correct level is obtained, press the
calibrator button once more for returning to normal
operation.
The displayed temperature, air pressure and humidity
may be adjusted in a similar way:
• Place a microphone in the coupler and select any
frequency.
• Press the calibrator button for about one second
until the display starts blinking and the LED turns
red. The calibrator button is accessible through a
small hole in the left-hand side of the cabinet. Use
a small rod with a diameter of about 1 mm.
• Press
°C/°F
and the temperature value starts
blinking.