B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 139)

CHAPTER 14

Specifications

131

Instantaneous Weather Data:

Wind Dir.

Wind Speed

Instantaneous GPS Data:

Latitude

Longitude

MEASURING RANGES

When using Microphone Type 4950

Dynamic Range: From typical noise floor to max.

level for a 1 kHz pure tone signal, A-weighted: 16.4 to

140 dB

Primary Indicator Range: In accordance with

IEC 60651: A-weighted: 23.6 dB to 122.3 dB

Linearity Range: In accordance with IEC 60804:

A-weighted: 21.5dB to 140.8dB

Linear Operating Range: In accordance with

IEC 61672:

• A-weighted 1 kHz: 24.9 dB to 139.8 dB

• C-weighted: 26.2 dB to 139.8 dB

• Z-weighted: 31.6 dB to 139.8 dB

Peak C Range: In accordance with IEC 61672: 1 kHz,

43.0 dB to 142.8 dB

SAMPLING FOR BROADBAND STATISTICS

Statistics can be based on either L

, L

or L

Aeq

•Statistics L

AFN1–7

or L

ASN1-7

are based on sampling

or L

, resp., every 10 ms into 0.2 dB wide

classes over 130 dB

•Statistics L

AN1–7

are based on sampling L

Aeq

every

second into 0.2 dB wide classes over 130 dB

Full distribution saved with measurement

The Std.Dev. (Standard Deviation) parameter is calcu-

lated from the Statistics

Measurement Display and Control

MEASUREMENT DISPLAYS

Measurement data displayed as numbers of various

sizes and one quasi-analog bar.

Measured data are displayed as dB values, house-

keeping data as numbers in relevant format.

Instantaneous measurement L

is displayed as a

quasi-analog bar

MEASUREMENT CONTROL

Manual: Manually controlled single measurement

Automatic: Pre-set measurement time from 1 s to

24 hr in 1 s steps

Manual Controls: Reset, Start, Pause, Back-erase,

Continue and Store the measurement manually

BACK-ERASE

The last 5 s of data can be erased without resetting the

measurement

PREFERENCES

Date, Time and Number formats can be specified

Measurement Status

ON SCREEN

Information such as overload and running/paused are

displayed on screen as icons

TRAFFIC LIGHTS

Red, yellow and green LEDs show measurement

status and instantaneous overload as follows:

• Yellow LED flash every 5 s = stopped, ready to

measure

• Green LED flashing slowly = awaiting calibration

signal

• Green LED on constantly = measuring

• Yellow LED flashing slowly = paused, measurement

not stored

• Red LED flashing quickly = intermittent overload,

calibration failed

NOTIFICATIONS

Sends an SMS or email daily at a specified time or if

an alarm condition is fulfilled.

Alarm Conditions:

• Disk space below set value

• Internal battery enters set state

• Change in measurement state

• Reboot of instrument

Calibration

Initial calibration is stored for comparison with later

calibrations

ACOUSTIC

Using Sound Calibrator Type 4231 or custom

calibrator. The calibration process automatically

detects the calibration level when Sound Calibrator

Type 4231 is used

ELECTRICAL

Uses internally generated electrical signal combined

with a typed-in value of microphone sensitivity

CALIBRATION HISTORY

Up to 20 of the last calibrations made are listed and

can be viewed on the instrument

Signal Monitoring

The input signal can be monitored using an

earphone/headphones connected to the headphone

socket

HEADPHONE SIGNAL

Input signal can be monitored using this socket with

headphones/earphones

Gain Adjustment: –60 dB to 60 dB

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