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Specifications
Optional program card specifications
The program card is a CompactFlash card which contains program data. After
these program data have been read off the card by the sound level meter during
the software installation process, the new function can be used.
The data on the program card are protected, to ensure that the card cannot be
used for several sound level meters simultaneously, and to prevent the files
from being easily copied in the Windows or MS-DOS environment.
Only one function can be selected for installation in the sound level meter.
1/1, 1/3 Octave Filter Card NX-21SA
Linearity range during filter operation is 65 dB.
Supported standard: IEC 61260 : 1995 Class 1
1/1 octave filters (IEC compatible)
Installed in NL-21: 16 Hz to 8 kHz
Installed in NL-31: 16 Hz to 8 kHz
1/3 octave filters (IEC compatible)
Installed in NL-21: 12.5 Hz to 10 kHz
Installed in NL-31: 12.5 Hz to 16 kHz
Universal Filter Card NX-21VA
3rd-order Butterworth high-pass filter and 3rd-order Butterworth low-
pass filter with freely selectable frequency in 1/3 octave steps
Linearity range during filter operation is 65 dB.
HPF cutoff frequencies (-3 dB)
Installed in NL-21: 10 Hz to 8 kHz
Installed in NL-31: 10 Hz to 12.5 kHz
LPF cutoff frequencies (-3 dB)
Installed in NL-21: 10 Hz to 8 kHz
Installed in NL-31: 10 Hz to 12.5 kHz
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