Sound Level Meter Model 831 Larson Davis
Perhatian!
Spesifikasi Sound Level Meter Model 831 Larson Davis
Sound Level Meter Model 831 Larson Davis |
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Sound Level Meter Specifications |
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Averaging ( Integration method ) |
Linear or Exponential |
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RMS Time Weighting |
Slow, Fast or Impulse |
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Frequency Weightings |
A, C or Z |
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Peak Detector Frequency Weighting |
A, C or Z |
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Gain |
0 dB or +20 dB |
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Exchange Rates |
3, 4, 5, or 6 dB with optional 831-IH |
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Sample Rate |
51,200 Hz |
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Peak Rise Time |
30 μμs |
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Physical Characteristics |
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Length with Microphone and Preamplifier |
11.35 in |
29.0 cm |
Length, Instrument Body Only |
8.8 in |
22.4 cm |
Width |
2.8 in |
7.1 cm |
Depth |
1.6 in |
4.1 cm |
Weight with Batteries, No Preamplifer or Microphone |
13.6 oz |
390 g |
Weight with Batteries, Preamplifer and Microphone |
1.2 lb |
550 g |
General Specifications |
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Reference level |
114.0 dB re. 20 μPa |
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Reference level range |
Single large range for SLM Normal for OBA option, Gain 0 dB |
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Reference frequency |
1000 Hz |
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Reference direction |
0° is perpendicular to the microphone diaphragm |
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Temperature |
≤ ± 0.5 dB error between +14 to +122 °F ( -10 to 50 °C ) |
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Storage temp. |
-13 to +158 °F ( -25 to +70 °C ) |
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Humidity |
≤ ± 0.5 dB error from 30% to 90% relative humidity at 104 °F ( 40 °C ) |
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Equivalent Microphone Impedance |
12 pF for Larson Davis 1/2 in microphone |
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Range Level Error (OBA option) |
≤ ± 0.1 dB relative to the reference range |
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Digital Display update Rate |
Four times per second ( 0.25 sec between updates ). First display indication is available 0.25 seconds after initiation of a measurement. |
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Effect of an Extension Cable |
None ( up to 200 ft or 61 m with EXCxxx cable ) |
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Electrostatic Discharges |
The instrument is not adversely affected by electrostatic discharges |
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Extended Weather Options |
-40 to +158 ºF ( -40 to +70 ºC ) operation with CER-831-E |
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Resolution Specifications |
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Levels |
0.1 dB |
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Dose |
0.1% |
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Elapsed time |
0.1 second |
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Real time clock |
1 second |
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Calendar Through |
31 Dec 2100 |
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Integration Time |
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Time Averaged Levels and Sound Exposure Levels ( s ) |
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Minimum |
0.1 second |
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Maximum with Daily Autostore Enabled |
Unlimited |
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Maximum with Daily Autostore Disabled |
> 23 days with error < 0.5 dB |
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Dosimeter Metrics : TWA, Dose ( s ) |
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Minimum |
0.1 second |
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Maximum |
Unlimited |
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Ln Statistics |
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Number of selectable parameters |
6 in xx.xx% format, visible on the Model 831 |
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Storage of Complete Table |
0.1 dB Steps |
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Spectral Statistics |
Requires Octave Analysis option ( 831-OB3 ) |
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Markers |
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Number of Markers |
10 |
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Prenamed Markers |
5 : Truck, Automobile, Motorcycle, Aircraft, Exclude |
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link Marker to Automatic Sound Recording |
Yes, requires Sound Recording option ( 831-SR ) |
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Back Erase |
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Back Ease Time |
5 or 10 seconds |
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Supported Modes |
Manual |
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Measurement Control Modes |
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Available Modes |
Manual Stop, Timed Stop, Stop when Stable, Continuous, Single Block Timer, Daily Block Timer |
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Timed Stop Time in |
hh:mm:ss |
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Stop When Stable |
Delta level in xx.x dB and time in hh:mm:ss |
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Continuous with Daily Auto-Store |
1, 2, 4, 6, 12, 24, 48, 96 or 144 files per day, automated file numbering “yymmddnn.LD0” |
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Continuous Restart on Power Failure |
Automatic if powered by 12VDC |
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Single Block Timer |
Start date and time to End data and time |
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Daily Block Timer |
Up to 3 blocks with each start and end date, blocks can cross date line |
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Clock Stability |
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< 1 sec in 24 hours, at 75 ºF ( +24 ºC ) |
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< 10 sec in 30 days, at -40 to +158 ºF ( -40 to +70 ºC ) |
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Digital Voice Annotation |
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Annotate Recordings |
Use headset ( ACC003 ) or measurement microphone |
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Recording Sample Rate |
8 ksps |
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Listening Options |
On the Model 831 or using processing software for .wav files |
PALLSCIENTIFIC
adalah perusahaan swasta nasional yang bergerak di bidang Hygiene Industri dan Kesehatan Lingkungan. Bertujuan untuk menjembatani dan memenuhi kebutuhan dunia industri khususnya dan masyarakat pada umumnya. perusahaan yang bergerak di bidang perdagangan barang dan jasa dengan meng-khususkan lingkup usaha perusahaan dalam bidang pengadaan peralatan hygiene industri dan kesehatan lingkungan, Peralatan Laboratorium, alat ? alat kesehatan, serta penyediaan jasa pemantauan, pengukuran lingkungan dan perbaikan peralatan.
PERDAGANGAN BARANG
Produk yang diperdagangkan perusahan utamanya adalah produk produk yang berkaitan dengan hygiene industri, kesehatan lingkungan, kesehatan & keselamatan kerja dan Peralatan laboratorium dan alat alat kesehatan .
Produk produk tersebut antara lain :
- Peralatan Pemantau Hygiene Industri dan Keselamatan Kerja Peralatan pemantau higiene industri dan keselamatan kerja meliputi :
- Alat ukur suara ( Sound Level Meter & Noise Dosimeter)
- Alat ukur getaran ( Vibration Monitoring)
- Alat detector gas berbahaya & mudah terbakar ( Gas Detektor & Flamable Gas Detector)
- Alat untuk pengambilan sampel gas, debu, mist, fume & aerosol ( gas, fume, aerosol sample pump & monitoring)
- Peralatan Pemantau Lingkungan Jenis peralatan tersebut antara lain :
- Peralatan sampling dan analisa udara maupun peralatan untuk sampling kualitas udara pada cerobong secara isokinetik otomatis
- Alat pantau cuaca stasioner yang dilengkapi dengan penyimpanan data ( data logging) sesuai parameter yang diukur.
- Peralatan pemantau kwalitas Air Bersih dan Air Minum ( Microbiologi, PH, Conductivity, ORP, Salinity, Dissolved, Turbiditi, TDS, Resisvity, Ion Meter dll..)
- Perlatan pemantau kadar kimia dalam makanan
- Scientific Instrument, Untuk :
- Laboratorium Kimia Dasar & Kimia Klinik : Laboratorium Bio Kimia, Kimia Klinik , Kimia Analitik, Mikrobiologi, Hematologi, Parasitologi, Kimia Farmasi & Toksikologi, Serologi, Virologi & Immunologi, Kimia Air, Kimia Makanan & Minuman, dll
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- Media dan Reagensia, Untuk :
- Menunjang kebutuhan reagent pada Rumah Sakit, Puskesmas, Klinik, dan Laboratorium.
- Survey Meter