126
Optional Accessories
Program Cards
A 1/1, 1/3 octave filter program card and a universal filter program card are
available as options. A program card is a CompactFlash memory 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 meanings of the words used in this chapter
• Load (sound level meter): To incorporate the program to sound level
meter.
• Unload (sound level meter): To remove the program from sound level
meter.
• Loaded (card): The card is used for loading the program to
sound level meter and cannot be used for the
other sound level meters.
• Unloaded (card): The card is not used for loading the program
to sound level meter (factory default).
The software on the program card are protected, to ensure that the card cannot
be used for several sound level meters simultaneously. The software from
only one program card can be loaded into the NL-21/NL-31.
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