FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Submission for testing
5 Marking of the sound level meter and information
in the Instruction Manual
6 Mandatory facilities and general requirements
7 Environmental, electrostatic, and radio-frequency tests
7.1 General
7.2 Expanded uncertainties for measurements of
environmental test conditions
7.3 Influence of static pressure
7.4 Tolerance limits on air temperature, relative humidity
and static pressure
7.5 Acclimatization requirements for tests of the influence
of air temperature and relative humidity
7.6 Abbreviated test of the combined influence of air
temperature and relative humidity
7.7 Influence of air temperature
7.8 Influence of relative humidity
7.9 Influence of electrostatic discharges
7.10 Influence of a.c. power-frequency and radio-frequency
fields
7.10.1 Sound signal
7.10.2 AC power-frequency tests
7.10.3 Radio-frequency tests
8 Radio-frequency emissions and public power supply
disturbances
9 Electroacoustical performance tests
9.1 General
9.2 Indication at the calibration check frequency
9.3 Directional response
9.4 Tests of frequency weightings with acoustical signals
9.4.1 General
9.4.2 Free-field tests
9.4.3 Closed coupler tests
9.4.4 Conformance
9.4.5 Random incidence
9.5 Tests of frequency weightings with electrical signals
9.5.1 General
9.5.2 First alternative test procedure (variable input
signal level)
9.5.3 Second alternative test procedure (constant input
signal level)
9.5.4 Conformance
9.5.5 Sound level meters with frequency weightings C
or Z, or flat frequency response
9.6 Corrections for the effect of reflections from the case
of a sound level meter and diffraction around a microphone
9.7 Adjustments to obtain free-field or random-incidence
sound levels
9.8 Level linearity
9.8.1 Tests at an air temperature near the reference
air temperature
9.8.2 Tests at elevated air temperature
9.9 Under-range indication
9.10 Self-generated noise level
9.11 Decay time constants for time weightings F and S
9.12 Toneburst response for sound level meters that measure
time-weighted sound level
9.13 Toneburst response for sound level meters that measure
sound exposure level or time-averaged sound level
9.14 Response to sequences of repeated tonebursts for sound
level meters that measure time-averaged sound level
9.15 Overload indication
9.16 C-weighted peak sound level
9.17 Reset
9.18 Electrical output
9.19 Timing facilities
9.20 Crosstalk in multi-channel sound level meter systems
9.21 Power supply
10 Pattern evaluation report