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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) |
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| 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 |
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| 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:
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| 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 |
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| 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 |
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| Trigger Socket | Connector: Triaxial LEMO Max Input Voltage: ± 20 Vpeak Input Impedance: > 1 MΩ |
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| Output Socket | Connector: Triaxial LEMO Max Input Voltage: ± 20 Vpeak Input Impedance: > 1 MΩ |
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| 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 |
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| 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 |
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| 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 |
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| Battery Pack | Type: Li-Ion rechargeable Typical Operating Time: > 8 hours |
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| 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 |
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| 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 |
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| 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) |
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| 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) |
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| 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 |
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| Weight And Dimensions | 650 g (23 oz) including rechargeable battery 300 x 93 x 50 mm (11.8 x 3.7 x 1.9 “) |
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