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Specifications – Type 2250 Platform

Specifications apply to Type 2250 fitted with Microphone Type 4189

and Microphone Preamplifier ZC 0032

SUPPLIED MICROPHONE

Type 4189: Prepolarized Free-field ½

″ Microphone

Nominal Open-circuit 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

Accessory Detection: Windscreen UA 1650 can be automatically

detected when fitted over ZC 0032

MICROPHONE POLARIZATION VOLTAGE

Selectable between 0 V and 200 V

SELF-GENERATED NOISE LEVEL

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

sensitivity:

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 colour touch screen 240 × 320 dot matrix

Colour Schemes: Five different – optimised for different usage

scenarios (day, night, etc.)

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

USB 1.1 OTG Mini B socket

INPUT SOCKET

Connector: Triaxial LEMO

Input Impedance: ≥ 1MΩ

Signal Source Impedance: <200Ω

Direct Input: Max. input voltage: ± 14.14 V

peak

CCLD Input: Max. input voltage: ± 7.07 V

peak

CCLD Current/voltage: 4mA/25V

TRIGGER SOCKET

Connector: Triaxial LEMO

Max. Input Voltage: ±20V

peak

Input Impedance: > 1 MΩ

OUTPUT SOCKET

Connector: Triaxial LEMO

Max. Peak Output Level: ±4.46V

Output Impedance: 50 Ω

HEADPHONE SOCKET

Connector: 3.5 mm Minijack stereo socket

Max. Peak Output Level: ±1.4V

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

Weighting Microphone Electrical Total

“A” 14.6 dB 12.6 dB 16.7 dB

“C” 13.6 dB 13.1 dB 16.4 dB

“Z” 5 Hz–20 kHz 15.3 dB 18.6 dB 20.3 dB

“Z” 3 Hz–20 kHz 15.3 dB 23.6 dB 24.2 dB

Some may have impulse or pure tone penalties, depending on which measurement standard

you choose, for example, ISO 1996, DIN 45 645, TA Lärm, NF S 31-010, or BS 4142. (See

Product Data BP 1752.)

Protector Type 7825 calculates noise exposure according to ISO 9612.2. For situations where

only workpoint noise measurements are available, Protector can combine these measurements

with a profile of a person’s movements, simulating their personal noise exposure. (See Product

Data BP 1717.)

Compliance with Standards

CE-mark indicates compliance with the EMC Directive and Low Voltage Directive.

C-Tick mark indicates compliance with the EMC requirements of Australia and New Zealand.

Safety EN/IEC 61010–1: Safety requirements for electrical equipment for measurement, control and laboratory use.

UL 61010B–1: Standard for Safety – Electrical measuring and test equipment.

EMC Emission EN/IEC 61000–6–3: Generic emission standard for residential, commercial and light industrial environments.

CISPR 22: Radio disturbance characteristics of information technology equipment. Class B Limits.

FCC Rules, Part 15: Complies with the limits for a Class B digital device.

IEC 61672–1, IEC 61260, IEC 60651 and IEC 60804: Instrumentation standards

EMC Immunity EN/IEC 61000–6–2: Generic standard – Immunity for industrial environments.

EN/IEC 61326: Electrical equipment for measurement, control and laboratory use – EMC requirements.

IEC 61672–1, IEC 61260, IEC 60651 and IEC 60804: Instrumentation standards

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