Option Filters
Up to seven option filters can be installed in the analog analyzer for weighted noise
or other special measurements. Only one option filter may be enabled at a time, and it
is cascaded with the standard bandwidth limiting filters. The following tables list only
the most popular types. Consult Audio Precision for custom designs.
Weighted Noise Measurement
FIL-AWT “A” weighting per IEC Rec 179. –see Figure 37
FIL-CCR Weighting per IEC468 (CCIR) and DIN 45404
(Also for CCIR/ARM). –see Figure 38
FIL-CIT Weighting per CCITT Rec P53. –see Figure 39
FIL-CMS “C-message” per BSTM 41004 and ANSI/IEEE
Std 743-1984. –see Figure 40
FIL-CWT “C” weighting per IEC Rec 179. –see Figure 41
Chapter 6: Specifications Option Filters
64 Getting Started with Your 2700 Series Instrument
Figure 37. FIL-AWT. ANSI-IEC “A”
Weighting Filter.
Figure 38. FIL-CCR. IEC468 (CCIR)/ DIN
45404 Noise Weighting Filter.
Figure 39. FIL-CIT. CCITT P53 Noise
Weighting Filter.
Figure 40. FIL-CMS.C-Message Weighting
Filter (ANSI/IEEE 743-1984).
Figure 41. FIL-CWT. “C”
Weighting (IEC-179).
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