Manual

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 ltering)
A-WTD A-weighting lter acc. IEC 60651
C-MESS C-Message lter 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 lter acc. ITU-T P.48
Set 1 lters are applicable with the measurement functions LEVEL
RMS, LEVEL REL, THD+N and SWEEP.
Set 2:
FLAT Flat frequency response (no ltering)
A-WTD A-weighting lter acc. IEC 60651
C-WTD C-weighting lter acc. IEC 60651
X-CRV
-1
inverted X-Curve lter acc. ISO 2969
Set 2 lters are applicable with the measurement functions LEVEL-
SPL and 1/3
rd
OCT., whereby the X-CRV
-1
lter is enabled in the
1/3
rd
OCT. mode only.
Any selected lter will stay active until it is disabled by the user.
However, if the lter is not supported by the measurement function,
it will be disabled automatically.
Basic Operation