Instruction manual

122
Speci cations
Calibration
Electrical calibration with signal from built-in oscillator
Calibration frequency: 1 kHz
Calibration sound pressure level: 94 dB
Acoustic calibration using sound calibrator NC-74
Calibration frequency: 1 kHz
Calibration sound pressure level: 94 dB (NL-52)
93.9 dB (NL-42)
Correction functions
Windscreen correction
Reduces in uence of mounted windscreen on frequency
response characteristics.
Turning on/off the correction function is done from
the menu screen.
* The unit complies with IEC 61672-1 and JIS C 1509-1
with windscreen mounted.
Diffuse sound  eld correction
Corrects frequency response to meet the standard (ANSI
S1.4) in diffuse sound  eld.
Turning on/off the correction function is done from
the menu screen.
Delay time Sets a delay in starting measurement from the point of
pressing the Start key.
Setting range: The delay time is selected from OFF,
1, 3, 5 or 10 sec and set to it.
Previous data removal function (Back-erase function)
When measurement is paused with the Pause key, the
data of some seconds from the point of pressing the
Pause key are excluded from processing.
Setting range: The time is selected from OFF, 1, 3
or 5 sec and set to it.