BRUEL & KJAER 2209 - Table of Contents

CONTENTS
1. INTRODUCTION ...................................... 5
1.1. Sound
Level Meters ........................... 5
1.2.
Impulse Sound Level Meters ..................... 6
1.3. Frequency Weighting Network D
................. 7
2. CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1. Function of Controls .......................... 9
3. OPERATION ........................................ 15
3.1. Calibration for Sound Measurements . . . . . . . . . . . . . 15
Using Pistonphone Type
4220 or Sound Level Calibrator
Type
4230 ................................. 15
Using the built-in Reference Voltage
............. 16
3.2. Measurement
of Sound ........................ 17
3.3. Calibration
for Vibration Measurements ........... 18
Using the Accelerometer
Calibrator Type 4291 . . . . . 18
Using the built-in Reference Voltage
............. 21
3.4. Measurement of Vibration ..................... 23
3.5. Accuracy
of Vibration Measurements . . . . . . . . . . . . . 23
3.6. Voltage Measurements
........................ 24
4. DESCRIPTION ....................................... 25
4.1. General
.................................... 25
4.2. Condenser Microphone
........................ 27
4.3.
Input Stage . ................................ 28
4.4.
Input Overload Indicator and Phase Splitter ........ 32
4.5. Weighting Networks . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.6. Attenuator
I and Input Amplifier ................ 34
4.7. Attenuator II and Output Amplifier .............. 35
4.8.
Output Overload Indicator . . . . . . . . . . . . . . . . . . . . . 36
4.9.
RMS Detector Circuit . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.10. Meter Amplifier and Hold Circuit ................ 43
4.11.
Peak Detector Circuit ......................... 44
4.12. Voltage Supply .............................. 46
4.13. Distortion
.................................. 47
4.14.
Inherent Noise Levels . . . . . . . . . . . . . . . . . . . . . . . . . 48