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Program Card NXseries

Sound Monitor Card NX-22J	Octave Filter Card NX-21SA (1/1,1/3 Octave filter)	Universal Filter Card NX-21VA (1/3 Octave step)
Add audio recording capability to the sound level meter	1/1 Octave filter: 16 to 8000 Hz 1/3 Octave filter: 12.5 to 16000 Hz	3rd-order Butterworth high-pass filter: 10 to 12500 Hz 3rd-order Butterworth low-pass filter: 10 to 12500 Hz

FFT Card NX-22FT	1/1, 1/3 Octave RTA Card NX-22RT
Add FFT analyzer function to the sound level meter.	Add 1/1, 1/3 Octave Real Time Analyzer function to the sound level meter. Analyzing Frequency range : 1/1 Octave: 16 Hz to 8 kHz, AP(A), AP 1/3 Octave: 12.5 Hz to 16 kHz, AP(A), AP