Brüel & Kjær 2240 Guide De L'utilisateur page 38

32 Integrating-averaging Sound Level Meter Type 2240 – User Guide
Compliance with Standards
Safety
EMC Emission
EMC Immunity
STANDARDS
Conforms with the following:
• IEC 61672 – 1:2002 Class 1
• IEC 60651 Type 1 (1979) with amendments 1 and 2
• IEC 60804 Type 1 (2000)
• ANSI S1.4 – 1983 Type S1
• ANSI S1.43 – 1997 Type 1
PARAMETERS
Four parameters are measured simultaneously:
• L , instantaneous sound pressure level, frequency
AF
weighting 'A' and time weighting 'F'
• L , maximum sound pressure level, frequency
AFmax
weighting 'A' and time weighting 'F'
• L , equivalent continuous sound pressure level,
Aeq
frequency weighting 'A'
• L , maximum peak sound pressure level, fre-
Cpeak
quency weighting 'C'
Resolution: 0.1 dB for all four parameters
MEASUREMENT CONTROL
Measurements are manually controlled
Measurement times between 1 s and 60 min
MEASURING RANGES
RMS: Total range: 30 – 140 dB
Two manually selected ranges: 30 – 110 dB and 60 –
140 dB
Peak: 60 – 143 dB
NOISE FLOOR
Below measurement range, <22 dB
DETECTORS
Simultaneous RMS and Peak with independent
frequency weightings
Linear Operating Range: 80 dB
CE-mark indicates compliacne with: EMC Directive and Low Voltage Directive.
C-Tick mark indicates compliance with the EMC requirements of Australia and New
Zealand
EN 61010–1 and IEC 61010–1: Safety requirements for electrical equipment for
measurement, control and laboratory use.
UL 3111–1: Standard for Safety – Electrical measuring and test equipment
EN/IEC 61000–6–3: Generic emission standard for residential, commercial and light
industrial environments
EN/IEC 61000–6–4: Generic emission standard for industrial environments
CISPR 22: Radio disturbance characteristics of information technology equipment.
Class B Limits
FCC Rules, Part 15: Complies with the limits for a Class B digital device
EN/IEC 61000–6–1: Generic standards – Immunity for residential, commercial and
light industrial environments
EN/IEC 61000–6–2: Generic standards – Immunity for industrial environments
EN/IEC 61326: Electrical equipmentfor measurement, control and laboratory use –
EMC requirements
FCC Rules, Part 15: Complies with the limits for a Class B digital device
FREQUENCY RANGE
20 Hz to 16 kHz
FREQUENCY WEIGHTINGS
A-weighting (RMS)
C-weighting (Peak)
Relative Response: See Fig.7.1 below.
TIME WEIGHTING
'F' (Fast)
OVERLOAD AND UNDER-RANGE INDICATORS
Overload is indicated at full-scale +0.3 dB
An overload detected during a timed measurement
latches and is displayed with the relevant parameters
until these are cleared
Under-range is indicated at scale lower limit –0.5 dB
MICROPHONE
Type 4188 Prepolarized Free-field 1/2
Microphone
Sensitivity: –30 dB re 1 V/Pa ± 2 dB (corresponding to
31.6 mV/Pa)
Frequency Range: 8 Hz to 16 kHz ± 2 dB
DISPLAY
LCD showing:
• Input signal level – indicated with a quasi-analogue
bar
• Selected parameters with level
• Warnings for: low battery, measurement in progress,
overload and under-range
• Measuring range
• Frequency and time weighting
• Elapsed measurement time
Update Cycle: 1 s (numeric), 0.1 s (bar graph)
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