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BRUEL & KJAER
Microphone
4148
BRUEL & KJAER 4148 User Manual
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1/2"
Condenser
Microphone
Type
4148
A
precision
condenser
microphone
needing
only
28
V
polarization
.
Frequency
range
4Hz
to
16
kHz.
Sensitivity
12.5
mV
per
N/
m
2
•
2
Table of Contents
Table of Contents
5
Influence of Temperature
5
Introduction
7
Purpose of the Half-Inch Condenser Microphone
7
Principle of Condenser-Microphone
7
Definitions
10
Description
13
Description of the Cartridge Type 4148
13
3.1. Sensitivity, Frequency Response
16
Free-Field Corrections
19
Directional Characteristics
21
Dynamic Range, Noise and Distortion
22
Equivalent Volume
22
Polarized Cartridge Capacity
22
Long-Term Stability
23
Environmental Influences
25
Influence of Ambient Pressure
26
Influence of Humidity
26
Influence of Vibration
27
Operation
28
5.1. Mounting
28
Operation with the 2619 Preamplifier
28
5.3. Operation with Cathode Followers 2614 and 2615
29
Operation with Sound Level Meter 2206 (2205 + UA 0208)
29
Service and Maintenance
30
Microphone Calibration
31
Pistonphone Type 4220
31
Sound Level Calibrator Type 4230
31
Microphone Calibration Apparatus Type4142
32
Electrostatic Actuator UA 0033
33
Accessories
35
Spec;Ifications
41
4
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BRUEL & KJAER 4148 Specifications
General
Type
Condenser
Polar Pattern
Omnidirectional
Sensitivity
50 mV/Pa
Output Impedance
200 ohms
Diameter
1/2 inch
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