B&K Type 2250 Light Sound Level Meter

Features

Dual-channel measurement capability
Large, high-resolution, touch-sensitive color screen
Data storage on high-capacity plug-in memory cards
Communication via USB, LAN, or GPRS/3G modems
Dynamic range in excess of 120 dB

Description
Additional information

Introduction B&K Type 2250 Light Sound Level Meter

B&K Type 2250 Light Sound Level Meter is a sound measuring instrument supplied with a basic application package, a microphone and a preamplifier. Type 2250-L contains everything you need to immediately get started with general sound level meter tasks.

B&K Type 2250 Light is a class 1 sound level meter and handheld analyzer, supplied with a rugged built and award-winning, easy-to-use interface. The instrument is ideally suited for measuring occupational, environmental and product noise.

In addition optional sound level meter apps can be installed that expand the instrument’s capabilities to 1/1- and 1/3-octave frequency analysis. These software modules provide features for product quality control and noise logging.

For measurements of on-site road vehicle exhaust noise according to ISO 5130 and local standards, Type 2250 Light has been incorporated into Noise Patrol Type i305 from IMS.

The Noise Patrol system can be used to measure exterior exhaust noise levels of motorbikes, cars, trucks and mopeds under stationary conditions (engine sweep test) with integrated RPM measurement control.

Noise Patrol is developed, sold and supported by IMS.

Features

Dual-channel measurement capability
Large, high-resolution, touch-sensitive color screen
Data storage on high-capacity plug-in memory cards
Communication via USB, LAN, or GPRS/3G modems
Dynamic range in excess of 120 dB
3 Hz – 20 kHz broadband linear frequency range
Recording measured signal during all or parts of a measurement (optional)
Personalized measurement, display and job setup
Integral digital camera for documentation and reference
“Smiley” quality indicators with hints and warnings
Timers for automatic start of measurement
PC software included for archiving, previewing and exporting data; software maintenance and remote online display
Automatic detection of and correction for windscreen
Weather data and GPS input
Robust and environmentally protected (IP44)

Specifications

Supplied Microphone

Type 4189: pre-polarized Free-field 1/2″ Microphone
Nominal sensitivity: 50 mV/Pa (corresponding to -26 dB re 1 V/Pa) ± 1.5 dB
Capacitance: 14 pF (at 250 Hz)

Microphone Preamplifier: ZC 0032

Nominal Preamplifier Attenuation: 0.25 dB
Connector: 10-pin Lemo
Extension Cables: up to 100 m in length between the microphone preamplifier and Type 2250, without degradation of the specifications

Microphone Polarisation Voltage

Selectable between 0 V and 200 V

Self-generated Noise Level

Typical values at 23 °C for nominal microphone open-circuit sensitivity:

Weighting	Microphone	Electrical	Total
A	14.6 dB	12.4 dB	16.6 dB
C	13.4	12.9 dB	16.2 dB
Z 5 Hz – 20 kHz	15.3 dB	18.3 dB	20.1 dB
Z 3 Hz – 20 kHz	15.3 dB	25.5 dB	25.9 dB

Keyboard

Push buttons: 11 keys with back light, optimised for measurement control and screen navigation

On-off Button

Function: press 1 s to turn on; press 1 s to enter standby; press for more than 5 s to switch off

Status Indicators

Leeds: red, amber and green

Display

Type: transflective back-lit colour touch screen 240 x 320 dot matrix

User Interface

Measurement Control: using push buttons on keyboard
Setup and Display of Results: using stylus on touch screen or push buttons on keyboard
Lock: keyboard and touch screen can be locked and unlocked

USB Interface

USB 1.1 OTG Mini B socket

Modem Interface

Hayes compatible GSM or standard analogue modems connected through the Compact Flash slot

Compact Flash Socket

For connecting CF memory card, CF modem, CF LAN Interface or CF WLAN Interface

Input Socket

Connector: tri-axial LEMO
Input Impedance: ≥ 1 MΩ
Signal Source Impedance < 200 Ω
Direct Input: Max input voltage: ± 14.14 Vpeak,
CCLD Input: Max input voltage: ± 7.07 Vpeak
CCLD Current/Voltage: 4mA/25 V
Note: CCLD = Constant Current Line Drive

Trigger Socket

Connector: Triaxial LEMO
Max Input Voltage: ± 20 Vpeak
Input Impedance: > 1 MΩ

Output Socket

Connector: Triaxial LEMO
Max Input Voltage: ± 20 Vpeak
Input Impedance: > 1 MΩ

Headphone Socket

Connector: 3.5 mm Mini-jack stereo socket
Max Peak Output Level: ± 1.4 V
Output Impedance: 2.2 Ω in each channel

Microphone For Commentary

Microphone, which utilises Automatic Gain Control (AGC), is incorporated in underside of instrument.
Used to create voice annotations for attaching to measurements

External DC Power Supply Requirements

Used to charge the battery pack in the instrument
Voltage: : 8 – 24 V DC, ripple voltage < 20 mV
Current Requirement: min. 1.5 A
Power Consumption: < 2.5 W, without battery charging.
Cable Connector: LEMO type FFA.00, positive at centre pin

Battery Pack

Type: Li-Ion rechargeable
Typical Operating Time: > 8 hours

Storage System

Internal Flash-RAM (non-volatile): 20 Mbyte for user setups and measurement data
External Secure Digital Memory Card (SD-card): For store/recall of measurement data
External Compact Flash Memory Card (CF-card): For store/recall of measurement data

Clock

Back-up battery powered clock. Drift < 0.5 s per 24 hour period

Warm-up Time

From Power Off: < 2 minutes s
From Standby: < 10 seconds for pre polarized microphones

Temperature

IEC 60068-2-1 & IEC 60068-2-2: Environmental Testing. Cold and Dry Heat.
Operating Temperature: < 0.5 dB, -10 to + 50 °C (14 to 122 °F)
Storage Temperature: -25 to +70 °C (-13 to 158 °F)

Humidity

IEC 60068-2-3: Damp Heat: 90 % RH (non-condensing at 40 °C (104 °F)).
Effect of Humidity: < 0.5 dB for 30 % < RH < 90 % (at 40 °C (104 °F) and 1 kHz)

Mechanical

Environmental Protection: Ip44
Non-operating:
IEC 60068-2-6: Vibration: 0.3 mm, 20 m/s2, 10-500 Hz
IEC 60068-2-27: Shock: 1000 m/s2
IEC 60068-2-29: Bump: 1000 bumps at 250 m/s2

Weight And Dimensions

650 g (23 oz) including rechargeable battery
300 x 93 x 50 mm (11.8 x 3.7 x 1.9 “)