1200/2200 Sound Level Meter Operator’s Manual17
Technical Information
5.5 Weighting Characteristics
The weighting characteristics (frequency response) for A, C, and Z are
shown in Figure 10. The "A" weighting response emulates the response of
the human ear and is used for most industrial and community noise mea-
surements. Generally, "C" weighting is used for measuring noise
reduction in hearing protectors and for other scientific purposes. “Z” is a
linear response from 5 Hz to 20 kHz.
Figure 10. A, C & Z Weighting
5.6 Tone Burst Response
Figures 11, 12 and 13 show how the meter responds to a sinewave input of
varied pulse duration for each response setting.
Figure 11. Fast Response
1200/2200 Sound Level Meter Operator’s Manual 18
Technical Information
Nominal decay times for each time response setting are as follows:
FAST - 34.7 dB per second
SLOW - 4.35 dB per second
IMPULSE - 2.9 dB per second
PEAK measurements have a rise time constant of 50uS. The dis-
played value is the highest peak occurring prior to a reset. Resets
occur every second in PAUSE. When the meter is in RUN a manual
reset is required.
Figure 12. Slow Response
Figure 13. Impulse Response
To Next Page
Loading...
