1、概述

　　声级计是一种与人耳大致相同的方式响应声音的仪器。使用声级计的目的是对声压级进行客观、可重复的测量。

　　声级计和噪音计通常用于描述同一种仪器。在谈到声级计时，主要区别在于精度的分类（由国际标准定义）。当然，所有的Bruel&Kjaer的声级计都符合最高的国家标准和国际标准。

　　2、如何使用声级计

　　B&K的声级计可用于各种行业和应用，例如:

　　优化建筑物的声学和振动

　　声功率和噪声源识别

　　产品噪声识别

　　工作噪声评估和OHS评估

　　当地和国家环境噪声及振动合规性

　　3、基本参数

　　4:详细说明

　　Measuring Ranges :

　　Note * : Level non-linearity caused by noise floor is < 0.4 dB at 30 dBA, re IEC 651 and < 1 dB at 26 dBA

　　Note 1 : with crest factor = 10 or 20 dB

　　Noise Floor :

　　Typically 18 dBA

　　Maximum : 20 dBA RMS

　　Includes preamplifier's electrical noise and microphone's thermal noise

　　Detectors : simultaneous RMS and Peak with independent frequency weightings

　　Linearity Range : 80 dB

　　Pulse Range : 83 dB

　　Non-linear Distortion : too small to affect accuracy

　　Peak Detector Rise Time : < 50 ms

　　Frequency Weightings : selected independently for RMS and Peak

　　RMS A and C : according to IEC 651 Type 1

　　RMS L : flat from 10 Hz to 20 kHz ± 2 dB with Type 1 tolerances

　　Peak C : according to IEC 651 Type 1

　　Peak L : flat from 10 Hz to 20 kHz ± 2 dB with Type 1 tolerances

　　Time Weightings : Fast, Slow, Impulse, according to IEC 651 Type 1

　　Display : 4 line LCD showing:

　　Measuring range and quasi-analogue bar showing input signal

　　Battery low, pause and overload with hold indicators

　　Time weighting and elapsed measurement time

　　Optional back light

　　The quasi-analogue bar is updated 15 times per second

　　Displayed parameter level updated once per second

　　Parameters :

　　MaxL, MinL, MaxP, Peak, SPL, Leq, SEL, LEP,d and Overload in % of measurement time + variable Ln, default values L90, L50 and L10

　　Exchange Rate : 3

　　Resolution :

　　LN Values : 0.5 dB

　　Other Parameters : 0.1 dB

　　Reset :

　　Resets Buffer including elapsed time to zero. Warning prior to reset if elapsed time > 1 min.

　　Reset when changing frequency or time weighting

　　Resets all results in Log, Memory and Buffer if held down together with (Data)

　　Optional reset when changing level of measurement range, Lns not available if range change is without reset

　　Microphone : Type 4188 pre polarized free-field 1/2" condenser microphone

　　Sensitivity : -30 dB re 1 V/Pa ± 2 dB

　　Frequency Range : 8 Hz to 12.5 kHz ± 2 dB

　　Capacitance : 12 pF

　　Memory : 40 Records of Overall Results

　　Result Logging : Leq : L10 and L90

　　Log Rate : 1 s : 10 s : 30 s : 1 m : 5 m : 10 m : 15 m : 30 m and 60 m.

　　Memory Capacity : 512 Kbytes, equivalent to 86400 sets of results (for example, 24 hours of 1 s logging)

　　Serial Interface : Compatible with EIA-574

　　Baud Rate : 1200 - 19200

　　Data Bits : 8

　　Stop Bit : 1

　　Parity : none

　　Handshake : Hardwired, XON / XOFF or None

　　Results Output Format :

　　Overall : Logged 2318 printer : Logged spreadsheet : Level Distribution : Cumulative Distribution : Distribution resolution 1 to 5 dB

　　Heading : long or short

　　DC Output : Short circuit protected coaxial Lemo socket (series 00)

　　Output : 50 mV/dB equivalent to 0 - 4.15 V

　　Output Resistance : 100 Ω

　　Output Parameter : same as the Displayed Parameter

　　AC Output : Short circuit protected coaxial Lemo socket (series 00)

　　Maximum Output : 0.5 V RMS corresponding to the top of the selected measurement range ± 2 dB depending on the microphone's sensitivity

　　Output Resistance : 100 Ω

　　Output : output signal from preamplifier (L frequency weighting)

　　Clock : real time, calendar and measurement duration

　　Warm up Time : < 5 s

　　Settling Time : at range change without reset: < 4 ms

　　Calibration Conditions :

　　Reference Frequency : 1000 Hz

　　Reference SPL : 94 dB

　　Reference Range : 50 - 130 dB, set automatically during calibration sequence

　　Reference Incidence : Frontal

　　Environmental :

　　Storage Temperature : -25 to +70 ° C

　　Operating Temperature : -10 to +50 °C

　　Effect of Temperature : < 0.5 dB, -10 to +50 °C

　　Effect of **midity : < 0.5 dB for 30 %RH at 40 °C and 1 kHz

　　Vibration Sensitivity : < 80 dB with L-weighting at 1 m/s-2

　　Magnetic Field : 80 A/m, 1?rsted at 50 Hz gives < 34 dBL

　　Power Supply - Internal :

　　Batteries : 4 x 1.5 V LR6 / AA size alkaline cells

　　Battery Life : > 12 hours, typically

　　Back up battery : keeps clock and memories operating for at least 6 months, if fully charged

　　External Power Supply:

　　Voltage : 7 - 15 V DC regulated

　　Voltage Ripple : < 100 mV peak to peak

　　Maximum Current : 400 mA

　　Average Current : 100 mA at 7 V

　　External Power Supply Socket :

　　Socket Pin: Positive

　　Socket Casing : Signal Ground

　　Socket Pin Diameter : 2.0 mm

　　Socket External Diameter : 5.5 mm

　　Dimensions and Weight :

　　Size : 257 mm x 97 mm x 41 mm

　　Weight : 460 g including batteries

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