Sound level meter LD 831
Price: Liên hệ
| Model | LD 831 |
| Manufacturer | Larson Davis |
| Power supply | |
| Weight | |
| Size | |
| Condition | Còn hàng |
| Warranty | 12 tháng |
I. Specifications of sound level meter LD 831
About the LD 831 meter:
- The LD831 Class 1 sound level meter, with its high definition display, is extremely versatile, performing the functions of several instruments.
- It puts the combined features of an accurate Class 1 sound level meter, environmental noise analyzer, personal noise dosimeter and real-time frequency analyzer in the palm of your hand.
- The Model 831 is the fifth generation Larson Davis sound level meter, designed for simple one-handed operation, yet full-featured, intelligent and flexible with an ever-expanding firmware platform.
- The design of sound level meter LD 831 is based on countless real experiences from customers. It expands on Larson Davis's tradition of delivering value, innovation, and functionality in a rugged, one-handed, extendable package and backed by a 2-year factory warranty, application support 24 hours and accredited factory service/calibration.
Standard features of the LD 831 sound meter:
- Compliant with IEC 61672-1: 2013, ANSI S1.4-2014 Class 1 sound level meter
- Voice captions
- EVERY LEVELS OF DISPLAY
- User-programmed test mode
- Six user-selectable statistics (Ln)
- Community Noise Calculations (Lden, CNEL)
- GPS support
- Backspace function
- Normalized spectrum
- User-selectable screen layouts and lockable protection settings
- Remote access and flexible upgradeability
- Multiple non-proprietary power supply options including internal batteries –4XAA, AC, USB and external batteries.
Supported PC software:
- G4 LD Utility - PC software supplied with the 831 meter supports full sound level meter control, optional upgrades and field firmware, data export to Excel® and includes an integrated “Screen Grabber” to display the SLM screen directly on the PC
- DNA - analysis, post-processing and reporting tool for sound and vibration measurements. DNA offers advanced analysis, audio playback, and graphical reporting. Graphs can be annotated and shared between multiple users using DNA reading software.
- Software Development Kit (SDK) - a toolkit for developing custom applications in MS Windows® or Linux for Model 831
- 3rd Party – The 831 Sound Meter has been integrated into various 3rd party software packages including airport noise management software
- Model 831 offers a complete solution for noise measurement. Whether in the office or in the field, the Model 831 can meet your acoustic measurement needs.
II. Specifications of Larson Davis LD831 sound level meter
GENERAL SPECIFICATIONS |
|
| Reference level |
114.0 dB re. 20 μPa |
|
Reference level range |
Single large range for SLM Normal for OBA option, Gain 0 dB |
| Reference frequency |
1000 Hz |
|
Reference direction |
0° is perpendicular to the microphone diaphragm |
| Temperature Effects |
≤ ± 0.5 dB error between +14 to +122 °F (-10 to 50 °C) |
|
Operating Temperature |
-13 °F to +122 °F (-25 °C to +50 °C) |
| Storage temperature |
-13 to +158 °F (-25 to +70 °C) |
|
Humidity |
≤ ± 0.5 dB error from 30% to 90% relative humidity at 104 °F (40 °C) |
| Equivalent Microphone Impedance |
12 pF for Larson Davis 1/2 in microphone |
|
Range Level Error (OBA option) |
≤ ± 0.1 dB relative to the reference range |
| 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. |
|
| Effect of an Extension Cable |
None (up to 200 ft or 61 m with EXCxxx cable) |
|
Electrostatic Discharges |
The instrument is not adversely affected by electrostatic discharges |
| Extended Weather Options |
-40 to +158 ºF (-40 to +70 ºC) operation with CER-831-E |
Resolution Specifications |
|
| Levels |
0.1 dB |
|
Dose |
0.1% |
| Elapsed time |
0.1 second |
|
Real time clock |
1 second |
| Calendar |
Through 31 Dec 2100 |
Integration Time |
|
|
Time Averaged Levels and Sound Exposure Levels (s) |
|
|
Minimum |
0.1 second |
| Maximum with Daily Autostore Enabled |
Unlimited |
|
Maximum with Daily Autostore Disabled |
> 23 days with error < 0.5 dB |
|
Dosimeter Metrics: TWA, Dose (s) |
|
|
Minimum |
0.1 second |
| Maximum |
Unlimited |
Ln Statistics |
|
| Number of selectable parameters |
6 in xx.xx% format, visible on the Model 831 |
|
Storage of Complete Table |
0.1 dB Steps |
| Spectral Statistics |
Requires Octave Analysis option (831-OB3) |
Markers |
|
| Number of Markers |
10 |
|
Prenamed Markers |
5: Truck, Automobile, Motorcycle, Aircraft, Exclude |
| Link Marker to Automatic Sound Recording |
Yes, requires Sound Recording option (831-SR) |
Back Erase |
|
| Back Ease Time |
5 or 10 seconds |
|
Supported Modes |
Manual |
Measurement Control Modes |
|
|
Available Modes |
Manual Stop, Timed Stop, Stop when Stable, Continuous, Single Block Timer, Daily Block Timer |
| Timed Stop |
Time in hh:mm:ss |
|
Stop When Stable |
Delta level in xx.x dB and time in hh:mm:ss |
| Continuous with Daily Auto-Store |
1, 2, 4, 6, 12, 24, 48, 96 or 144 files per day, automated file numbering “yymmddnn.LD0” |
|
Continuous Restart on Power Failure |
Automatic if powered by 12VDC |
| Single Block Timer |
Start date and time to End data and time |
|
Daily Block Timer |
Up to 3 blocks with each start and end date, blocks can cross date line |
Clock Stability |
|
|
< 1 sec in 24 hours, at 75 ºF (+24 ºC) |
|
|
< 10 sec in 30 days, at -40 to +158 ºF (-40 to +70 ºC) |
|
Digital Voice Annotation |
|
| Annotate Recordings |
Use headset (ACC003) or measurement microphone |
|
Recording Sample Rate |
8 ksps |
| Listening Options |
On the Model 831 or using processing software for .wav files |
III. Video
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