BRUEL & KJAER 4184-A, Техническая документация инструкция, Страница: 7 / 52

1
Chapter 1
Introduction
1.1 About This Supplement
This document is a supplement, to Instruction Manual for Hand-held Analyzer Types 2250, 2250-L and
2270 BE 1712. It provides the information relevent when Hand-held Analyzer Type 2250, 2250 L or 2270
is configured with Weatherproof Microphone Unit Type 4184-A.
The combination of Weatherproof Microphone Unit Type 4184-A and the hand-held analyzer is intended
for outdoor use where a weatherproof microphone solution is needed.
The numbering of chapters, sections, figures and tables in this supplement corresponds to
Instruction Manual BE 1712. This supplement only contains content that is different from the
instruction manual and is specific to this microphone configuration. The other chapters, sections,
figures and tables should be read in Instruction Manual BE 1712.
Also see section 1.1 of the instruction manual.
1.2 System Overview
1.2.4 Hardware Setup
This section provides an overview of the additional hardware components used when the analyzers are
configured with Weatherproof Microphone Unit Type 4184-A. The other hardware components can be
found in Instruction Manual BE 1712, section 1.2.4.
NOTE:
• Only one Weatherproof Microphone Unit Type 4184-A can be connected to Type 2270
• Weatherproof Microphone Unit Type 4184-A is calibrated with Brüel & Kjær Pistonphone
Type 4228, which has a calibration frequency of 251.2 Hz and a calibration level of approximately
124 dB
• Weatherproof Microphone Unit Type 4184-A includes the Microphone Preamplifier Type ZE-0773
• Weatherproof Microphone Unit Type 4184-A is specified for two reference directions. In the user
interface they are selected as two different microphones and are called: 4184-A 0° (Top) and 4184-A
90° (Side)
– 4184-A 0° (Top)’s reference direction is defined as the inward direction toward the Microphone
Reference Point on the microphones rotational axis coming from the opposite direction of the
electrical output
– 4184-A 90° (Side)’s reference direction is defined as the inward direction toward the Microphone
Reference Point perpendicular to the microphones rotational axis
• Weatherproof Microphone Unit Type 4184-A has a built-in Windscreen and is therefore not specified
without the Windscreen