User manual

306
Appendix
Impact of Electromagnetic Fields
If the device is exposed to electromagnetic fields of 10 V/m,
the measurement of sound levels below 74 dB is not speci-
fied. If the electromagnetic fields exceed 10 V/m, the exposed
instrument is not specified in any level range.
Susceptibility to AC Power and Radio Frequency Fields
(Refer IEC61672-1 paragraphs 6.6.3, 9.3o)
The device has the greatest susceptibility to AC power fre-
quency fields, if the direction of the magnetic field is the same
as the orientation of the microphone axis.
The device has the greatest susceptibility to radio frequency
fields, if the surface normal of the display and the direction of
the incoming radio frequency field are parallel to each other.
Measuring Low-Level Sound Fields
(Refer IEC61672-1 paragraphs 5.6.5, 9.2.5d)
If the sound level is very low, the measurement result is af-
fected by the noise floor of the sound level meter. The speci-
fied configuration complies with class 1 within the given linear
measuring range.
Influence of the ASD Cable
(Refer IEC61672-1 paragraphs 7.1, 9.2.6b)
The ASD Cable serves as connection cable between the
XL2-TA sound level meter and the microphone in the detached
configuration. There are no correction values required for this
configuration.
Influence of Mechanical Vibrations
Mechanical vibrations with 1 m/s
2
acceleration perpendicular
to the membrane of the microphone, will raise the lower limit
of the linear operating range to 71 dB (A-weighted) for the fre-
quencies 31,5 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 630 Hz,
800 Hz and 1000 Hz.
Mechanical vibrations with 1 m/s
2
acceleration parallel to the
membrane of the microphone, will raise the lower limit of the
linear operating range to 68 dB (A-weighted) for the frequen-
cies 31,5 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 630 Hz, 800 Hz
and 1000 Hz.
Modes of Operation and Accessories
The greatest susceptibility to radio frequency fields is indepen-
det of operation mode or connected accessories.