NTi Audio Minilyzer ML1 - Manual (Page 14)

14
b. Selection of Filters
Fig 2.3 Example of Filter Submenu
There are two sets of filters with the following characteristics
available:
Set 1:
FLAT Flat frequency response (no filtering)
A-WTD A-weighting filter acc. IEC 60651
C-MESS C-Message filter acc. CCIR Rec. 468-4
HP22 Highpass 22 Hz acc. DIN 45045, -120 dB/dec.
HP60 Highpass 60 Hz acc. DIN 45045, -120 dB/dec.
HP400 Highpass 400 Hz acc. DIN 45045, -120 dB/dec.
VOICE Voice band filter acc. ITU-T P.48
Set 1 filters are applicable with the measurement functions LEVEL
RMS, LEVEL REL, THD+N and SWEEP.
Set 2:
FLAT Flat frequency response (no filtering)
A-WTD A-weighting filter acc. IEC 60651
C-WTD C-weighting filter acc. IEC 60651
X-CRV -1 inverted X-Curve filter acc. ISO 2969
Set 2 filters are applicable with the measurement functions LEVEL-
SPL and 1/3 rd OCT., whereby the X-CRV -1 filter is enabled in the
1/3 rd OCT. mode only.
Any selected filter will stay active until it is disabled by the user.
However, if the filter is not supported by the measurement function,
it will be disabled automatically.
Basic Operation