Sound level meter
LA-4441A
Three sound level meter models, LA-1411/1441A (Class 2) and LA-4441A (Class 1), comply with IEC 61672-1:2013 and JIS C 1509-1:2017 standards. These models simultaneously measure seven sound parameters, including continuous sound levels, without the need to adjust the level range for sound fluctuations. They also display the selected parameters.
The microphones can be used at a distance from the main sound level meter unit, thanks to exclusive coaxial cables. These new sound level meters feature a curved body design to minimize sound reflection, an easy-to-read intuitive operating menu, and an ergonomic interface for enhanced usability.
Additionally, LA-1441A/4441A sound level meters can easily transfer measurement results to a PC through RS-232C or USB interfaces, allowing for remote control and data transfer using user-prepared software.
Features
Simultaneous measurements of seven sound items including equivalent continuous sound level (Leq) and displays of measurement results to be selected.
Essential seven sound items for sound measurement including equivalent continuous sound level (Leq) can be measured at the same time, and also displayed to be selected. The LA series sound level meters greatly help the effective sound level measurement without any miss-measurement.
- Lp time-weighted sound level
- Leq time-average sound level (equivalent continuous sound level)
- LE sound exposure level
- Lmax maximum time-weighted sound level
- Lmin minimum time-weighted sound level
- Lpeak peak sound level
- LＮ percentile sound pressure level
Microphone can be separated from the main unit of sound level meter by connecting several exclusive coaxial cable(s).
Microphone can be separated from the main unit of sound level meter by connecting several exclusive coaxial cable(s). It enables measurement of great distance away.
Simple and easy data processing
Connecting the main unit of sound level meter with Windows-based PC via RS-232C or USB cable, the LA series can transfer the obtained measurement data to the PC easily and quickly, also can be operated and controlled remotely from PC with a software (user preparation).
(Excluding LA-1411)
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LA-1411 |
LA-1441A |
LA-4441A |
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Applicable standard |
IEC 61672-1 : 2013 Class 2 |
IEC 61672-1 : 2013 Class 1 |
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JIS C 1509-1 : 2017 Class 2 |
JIS C 1509-1 : 2017 Class 1 |
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Microphone |
1/2-inch backelectret-type |
1/2-inch backelectret-type |
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Preamplifier |
MI-3111 Preamplifier for mocrophone |
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Linearity range |
100 dB (Wide range), 80 dB (Normal range) |
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Measurable frequency range |
10 Hz to 8 kHz(IEC, JIS) |
10 Hz to 20 kHz(IEC, JIS) |
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Measurement level range |
A : 26 to 135 dB(IEC, JIS) |
A : 27 to 135 dB(IEC, JIS) |
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Frequency weighting |
A，C，Z |
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Intrinsic noise |
A : 20 dB or less |
A : 19 dB or less |
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Level range |
20 to 90 dB, 30 to 90 dB, 40 to 100 dB, 50 to 110 dB, 60 to 120 dB (Normal range), |
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Time weighting |
FAST, SLOW |
FAST, SLOW, Impulse, 10 ms |
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Measurement items |
Lp, Leq , LE, Lmax, Lmin, Lpeak, LＮ(Lhigh, L5, L10, L50, L90, L95, Llow, Lave) |
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Level trend |
Ｌp, every kind of calculated value |
Lp, every kind of calculated value |
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Sampling interval |
31.25 μs (other than LN ) |
20.83 μs (other than LN) |
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Measurement time |
Manual, arbitrary setup (199 h 59 m 59 s max.) |
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Total measurement time |
--- |
Arbitrary setup (199 h 59 m 59 s max.) |
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Start mode |
Manual only |
Manual, timer (Hour,minute), trigger (can be started after a lapse of specified time [0 to 10 seconds, in increment of 1 minute] after trigger detection: trigger delay function) |
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Internal calibration signal (REFOUT) |
1 kHz sine wave (For upper limit level range : -6 dB(normal range), -16 dB(wide range)) |
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Recommended sound calibrator |
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Display |
LCD with LED backlight semitransparent (124 x 64-dot) |
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Display update time |
Display by numeric:1 s, bar indicator: 0.1 s, trend screen: 0.2 s |
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Manual memory function |
Total calculated values: 100 addresses |
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Auto memory function |
--- |
Leq : 1000 addresses x 200 blocks |
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Lp Record memory function |
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Sound level with time weighting is stored at the specified interval. (1000 address × 200 blocks) |
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Measurement condition memory function |
Condition memories (9 kinds) |
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Resume function |
Settings activated at power ON can be selected from follows; settings used at previous power OFF, factory setting, and any condition memory number which is set from menu. |
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Backup function |
The backup of data stored in clock and memory can be performed by built-in secondary power source. |
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AC output |
0.707 Vrms/F.S (normal range), 2.236 Vrms/F.S. (wide range), load resistance 10 kΩ or more (with upper-limitation value of bar indicator) Frequency weighting can be selected: conjunction with selected frequency weighting or fixed to Z-weighting. |
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DC output |
2.5 V/F.S. (with upper-limitation value of bar indicator) |
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External control input |
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Operation: toggle operation of start/place in pause Specifications of hardware: negative pulse input Pulse width: 100 ms or more |
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Comparator function (Option: LA-0141) |
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Set comparison value : 40.0 to 130.0 dB(in increment of 0.1 dB) |
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Timer function |
Built-in (year/month/day/hour/minute) |
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RS-232C |
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Control of operation, data output, print out (to the DPU-414 printer) |
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USB |
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Control of main unit and data output, |
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Cable extension (Between microphone and main unit) |
305 m max. |
105 m max. |
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Printer function |
- |
Content: Measurement value, measurement start/stop time, Normal (alphanumeric) or screen image Applicable printer: DPU-414 |
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Power requirement |
Size AA battery × 2 pcs. |
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Battery life (continuous using) |
Approx. 8 hours (LR6 alkaline battery in use / 23 °C/ backlight off / not RS-232C･USB in use) |
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Operating (storage) temperature range |
-10 to 50 °C (-20 to 60 °C) |
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Operating (storage) humidity range |
25 to 90 %RH (10 to 90 %RH) with no condensations |
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Outer dimensions |
Approx. 78(W) × 263(H) × 47(D) mm |
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Weight |
Approx. 360 g (including batteries) |
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Accessories |
Windscreen×1 (φ 70 mm), carrying case×1, hand strap×1, |
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Option |
• LA-0141 Comparator output option |
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