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In this example, the hammering sound of a
metal part (e.g. a casting part) suspended in free vibration
is measured by the LA-5560 Integrating sound level meter.
The CF-4500 performs frequency analysis of the AC output
from the LA-5560 to find difference of power spectrum shape
between OK and NG products. The Shape comparator function of
the CF-4500 can be used for OK/NG judgment by the difference
of power spectrum shape. (option: CF-0452 Shape comparator
function)
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Judgment area block (max: 20 blocks) is set
up by the specified frequency range on the power spectrum
and the upper/lower-limit levels. The most suitable judgment
method can be selected from 5 kinds of judgment methods
(level, peak level, peak max, section overall or area rate
of content). The Digital I/O function also enables control
by PLC*via comparator output.
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MI-1234 (microphone), MI-3111
(preamplifier), SR-2200 (sensor amplifier) and SC-3120
(sound calibrator) can be used in place of a sound level
meter.
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Measurement result can be stored in a PC via
LAN or RS-232C interface.
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The OS-2740 Sound quality evaluation pack
(sold separately) can quantify the sound by using six
psychoacoustic parameters of [Loudness], [Sharpness],
[Roughness], [Fluctuation Strength], [AI], and [Tonality].
* PLC: Programmable Logic
Controller
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