SUPPLIED MICROPHONE

Type 4950: Prepolarized Free-field ½″ Microphone

Nominal Open-circuit Sensitivity: 50 mV/Pa (corresponding to −26 dB re 1 V/Pa) ± 2 dB

Capacitance: 12.5 pF (at 250 Hz)

MICROPHONE PREAMPLIFIER ZC-0032

Nominal Preamplifier Attenuation: 0.3 dB

Connector: 10-pin LEMO

Extension Cables: Up to 100 m in length between the microphone preamplifier and 2250 Light, without degradation of the specifications

KEYBOARD

Pushbuttons: 11 keys with backlight, 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

LEDs: Red, amber and green

DISPLAY

Type: Transflective back-lit touch screen 240 × 320 dot matrix

Black and White Scheme

Backlight: Adjustable level and on-time

USER INTERFACE

Measurement Control: Using pushbuttons on keyboard

Setup and Display of Results: Using stylus on touch screen or pushbuttons on keyboard

Lock: Keyboard and touch screen can be locked and unlocked

USB INTERFACE

USB1.1 OTG Mini B socket

MODEM INTERFACE

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

HEADPHONE SOCKET

Connector: 3.5mm Minijack stereo socket

Max. Peak Output Level: ± 1.4V

Output Impedance: 32Ω in each channel

EXTERNAL DC POWER SUPPLY REQUIREMENTS

Used to charge the battery pack in the instrument

Voltage: 8 . 24VDC, ripple voltage < 20mV

Current Requirement: min. 1.5A

Power Consumption: < 2.5W, without battery charging, < 10 W when 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 < 0.45 s per 24 hour period

WARM-UP TIME

From Power Off: < 2 minutes

From Standby: < 10 seconds

TEMPERATURE

IEC 60068.2.1 & IEC 60068.2.2: Environmental Testing. Cold and Dry Heat

Operating Temperature: .10 to + 50°C (14 to 122°F), < 0.1 dB

Storage Temperature: .25 to +70°C (.13 to +158°F)

HUMIDITY

IEC 60068.2.78: Damp Heat: 90% RH (non-condensing at 40°C (104°F)).

Effect of Humidity: < 0.1 dB for 0% < RH < 90% (at 40°C (104°F) and 1 kHz)

MECHANICAL

Environmental Protection: IP 44

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: 4000 bumps at 400 m/s2

WEIGHT AND DIMENSIONS

650 g (23 oz.) including rechargeable battery

300 × 93 × 50mm (11.8 × 3.7 × 1.9″) including preamplifier and microphone

LANGUAGE

User Interface in Catalan, Croatian, Czech, Danish, English, Flemish, French, German, Hungarian, Japanese, Italian, Polish, Portuguese, Romanian, Serbian, Slovenian, Spanish, Swedish and Turkish