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SUPPLIED MICROPHONE
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Type 4950: Prepolarized Free-field ½″ Microphone
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Nominal Open-circuit Sensitivity: 50 mV/Pa (corresponding to −26 dB re 1 V/Pa) ± 2 dB
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Capacitance: 12.5 pF (at 250 Hz)
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MICROPHONE PREAMPLIFIER ZC-0032
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Nominal Preamplifier Attenuation: 0.3 dB
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Connector: 10-pin LEMO
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Extension Cables: Up to 100 m in length between the microphone preamplifier and 2250 Light, without degradation of the specifications
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KEYBOARD
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Pushbuttons: 11 keys with backlight, optimised for measurement control and screen navigation
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ON-OFF BUTTON
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Function: Press 1 s to turn on; press 1 s to enter standby; press for more than 5 s to switch off
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STATUS INDICATORS
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LEDs: Red, amber and green
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DISPLAY
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Type: Transflective back-lit touch screen 240 × 320 dot matrix
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Black and White Scheme
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Backlight: Adjustable level and on-time
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USER INTERFACE
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Measurement Control: Using pushbuttons on keyboard
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Setup and Display of Results: Using stylus on touch screen or pushbuttons on keyboard
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Lock: Keyboard and touch screen can be locked and unlocked
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USB INTERFACE
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USB1.1 OTG Mini B socket
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MODEM INTERFACE
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Hayes compatible GSM or standard analogue modems connected through the Compact Flash slot
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HEADPHONE SOCKET
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Connector: 3.5mm Minijack stereo socket
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Max. Peak Output Level: ± 1.4V
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Output Impedance: 32Ω in each channel
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EXTERNAL DC POWER SUPPLY REQUIREMENTS
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Used to charge the battery pack in the instrument
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Voltage: 8 . 24VDC, ripple voltage < 20mV
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Current Requirement: min. 1.5A
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Power Consumption: < 2.5W, without battery charging, < 10 W when charging
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Cable Connector: LEMO Type FFA.00, positive at centre pin
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BATTERY PACK
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Type: Li-Ion rechargeable
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Typical Operating Time: > 8 hours
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STORAGE SYSTEM
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Internal Flash-RAM (non-volatile): 20 Mbyte for user setups and measurement data
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External Secure Digital Memory Card (SD-card): For store/recall of measurement data
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External Compact Flash Memory Card (CF-card): For store/recall of measurement data
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CLOCK
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Back-up battery powered clock. Drift < 0.45 s per 24 hour period
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WARM-UP TIME
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From Power Off: < 2 minutes
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From Standby: < 10 seconds
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TEMPERATURE
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IEC 60068.2.1 & IEC 60068.2.2: Environmental Testing. Cold and Dry Heat
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Operating Temperature: .10 to + 50°C (14 to 122°F), < 0.1 dB
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Storage Temperature: .25 to +70°C (.13 to +158°F)
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HUMIDITY
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IEC 60068.2.78: Damp Heat: 90% RH (non-condensing at 40°C (104°F)).
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Effect of Humidity: < 0.1 dB for 0% < RH < 90% (at 40°C (104°F) and 1 kHz)
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MECHANICAL
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Environmental Protection: IP 44
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Non-operating:
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IEC 60068.2.6: Vibration: 0.3 mm, 20 m/s2, 10 . 500 Hz
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IEC 60068.2.27: Shock: 1000 m/s2
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IEC 60068.2.29: Bump: 4000 bumps at 400 m/s2
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WEIGHT AND DIMENSIONS
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650 g (23 oz.) including rechargeable battery
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300 × 93 × 50mm (11.8 × 3.7 × 1.9″) including preamplifier and microphone
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LANGUAGE
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User Interface in Catalan, Croatian, Czech, Danish, English, Flemish, French, German, Hungarian, Japanese, Italian, Polish, Portuguese, Romanian, Serbian, Slovenian, Spanish, Swedish and Turkish
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