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The calibration level screen will then be displayed (Figure H). This screen is used to set
the exact reference level used by the acoustic calibrator. Refer to the calibration
certificate for the acoustic calibrator for the calibrator output level.
The 'Signal input source' screen (Figure I) will then be shown. NOTE: this option is for
the use of acoustic laboratories only. This allows the signal input to be routed from either
the inbuilt microphone or from an external signal generator connected via the auxiliary
2.5mm headphone socket. Press the right key
input
or Alternating Current input
is for microphone input. Press the left key
Specification
General
Designed to provide functionality with respect to the following international standards:
IEC 61672-1 2002-5
ANSI S1.4 Type 2A
Range:
Display range: 30-130dB(A) RMS, available in 2 ranges, 30-100dB and
60-130dB. Linear operating range 10dB above noise floor.
RMS Frequency Weightings
A and C filter weightings, satisfying IEC 61672-1: 2002 Class 2, ANSI S1.4 Type 2A.
Noise Floor
Total noise floor typically <33dB(A).
Frequency Response
Overall frequency response as per IEC 61672-1: (2002) Class 2, ANSI S1.4 Type 2A.
Time Weightings
Fast, Slow and Impulsive according to IEC 61672-1: (2002), ANSI S1.4 Type 2A.
Reference Conditions
o
20
C air temperature, 65% Relative Humidity, 101.325kPa atmospheric pressure.
Nominal reference level = 114.0dB at 1kHz. Free field perpendicular incidence.
Operating Environmental Conditions
Humidity:
Temperature range:
Pressure:
to confirm any changes.
(Electro-Acoustics – Sound Level Meters) Group 'X'
instruments, Performance Class 2.
Specification for Sound Level Meters
5 to 90%RH in the absence of condensation.
o
0 to 40
C.
65 to 108kPa
to switch between microphone
. The default power up selection
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