| Digital
Sound Level Meter Model KM 927 |
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Sound is an oscillation of air molecules caused by pressure differences. A sound emitting source causes
the surrounding to oscillate. The air transmits these pressure differences.
Frequency Evaluation by means of Filter A&C.
As the microphone accepts the sound pressure evenly within its frequency range, in opposition to the
human ear, the instrument must be equipped with an additional filter to stimulate the human frequency
evaluation. Thus, when selecting the A-evaluation, the sensitivity of the human ear approx simulated within the range of 100 Hz is reduced by 20 DB, the sound within the frequency range of 1000 Hz remains without modifications. It is recommended to carry out a C-Curve evaluation as shown in fig.1. When
dealing with very loud sounds of low
frequency.
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• 3
1/2 Digits Display (1999 Counts)
• Functions
keys : MAX / MIN Hold.
• AC
/ DC signal output
• Low
Battery Indications
• Applicable
Standards : 1EC 651 Type II
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Display
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3½ digits large
LCD display, (1999 Counts)
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Frequency Range
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31.5
Hz ~ 8k Hz |
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Measuring Level Range
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30~130 DB
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Measurement Item
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SPL (Sound
Pressure Level)
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Frequency Weighting
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A, C
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Microphone
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1/2 inch Electric condenser
microphone.
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Time Weighting
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FAST (125 mS), S
10W (1 sec)
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Accuracy
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± 1.5 dB (ref
94 dB @ 1 KHz)
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Level ranges
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Lo: 30 ~ 80 dB;
Med: 50 ~ 100 dB; Hi : 80 ~ 130 dB
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Dynamic Range
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50
DB |
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Alarm Function
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"Over"
is shown when input is more than upper limit of range
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"Under"
is shown when input is less than lower limit of range
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Power Supply
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Single
9V Battery |
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DC Adapter Socket
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Voltage 9V, (8~13V, max)
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Supply Current
>30 mA
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Operation Height
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Upto 2000 M Above Sea Level
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Operation Temp. & Humidity
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5 Deg C to 40
Deg C, below 80% Y.R.H
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Storage Temp. &
Humidity
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-10 Deg C to 60
Deg C, below 80% Y.R.H
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Dimensions
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280 mm (L) x 80
mm (W) x 32 mm (H)
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Weight
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Approx. 300 gms
(including battery)
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Accessories
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Instruction
Manual, Carrying Case, Screw driver x 1pc, 3.5 Æ plug x 1
pc, 9V battery x 1 pc.
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| Sound
Level Calibrator : |
Conform to ANSI S1. 4-1984/ EC 942 1998 class 2.
Calibration level of 94 dB, 1KHz.
Fits 1”, ½”, ¼” – diameter Microphone
Low Battery Indication
Auto Power off. |
| Applications
: |
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KM
927 Digital Sound Level meter is designed and built to
meet the measurement requirements of Safety Engineers,
Health, Industrial Safety Offices and quality control in
various environments according to IEC 651 Type II, ANSI
S1.4 II.
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