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TABLE OF CONTENTS
INTRODUCTION……………………………………………………………………………………….3
M-27 SIMPLIFIED OPERATING INSTRUCTIONS…………………………….…………………..5
Control Keys…………………………………………………………………………..……..5
Sound Level Meter Keys……………………………………………….…………………..6
Dosimeter Keys………………………………………………………………………….…..6
Time Keys……………………………………………………………………………………..7
Event Keys……………………………………………………………………………………7
Procedure to Accumulate Event Data…………………………..……………………….7
Setting the Clock……………………………………………………………..……………..8
Recording the Calibration Level………………………………………………….………8
Using a Printer……………………………………………………………………………….9
Dumping Raw Data……………………………………………..…………….……………11
Changing Printer Parameters……………………………………….……….…………..11
SPECIFICATIONS………………………………………………………………………….…………11
GENERAL DESCRIPTION…………………………………………………………………………..12
PRINCIPLES OF OPERATION……………………………….……………………….…………….13
General……………………………………………………………….………………………13
Weighting Characteristics………………………………………………….……………..13
Microcomputer Modes…………………………………..…………………………………14
Formulas and Definitions……………………………………….…………………………16
TESTING AND CALIBRATION………………………………………………………………………17
Battery Test…………………………………………………………………………………..17
Battery Replacement……………………………………….……………………………….17
Microphone Replacement……………………………………………..…………………..18
Calibration and Maintenance…………………………………………………..………….18
Daily Calibration……………………………………………………………………………..18
Altitude Corrections……………………………………..………………………………….19
OPERATING PROCEDURE…………………………………………………….………………….…19
As a Personal Noise Dosimeter……………………..……………………………………19
As an Area Monitor………………………………………………..………………………..20
As a Survey or Event Monitor…………………………………………….………………21
Effects of Operator's Presence……..……………………………………………………22
Use with Windscreen……………………………………………………………………….22
Using a Printer……………………………………………………………………………….23
Connections to Printer……………………………………………………………………..24
Sample Printouts………………………………………………………..…………………..24
Memory Map……………………………………………………………………………..…...30
Editing Printout………………………………………………………………………………31
Printer Setup……………………………….…………………………………………………32
EXTENDING BATTERY LIFE………………………………………..……………………………….33
INTERNAL SWITCHES………………………………………………………………..….…………..34
Switch Positions……………………………………………………………………….……36
Setting Internal Switches………………….………………………………………………38
Code Decoding…………………………………………..……………..…………………..41
TROUBLESHOOTING………………………………………………………….…………………….42
INTERPRETING RESULTS………………………………………………………………….………43
Use of Lavg and TWA……………………………………………………………………..43
Estimating TWA from Lavg…………………………..………………………………….44
Accuracy of Readings………………………………………..…………………………..44
Hints and Good Practices………………………………………….…………………….44
Considerations of Measurement and Accuracy…………………..…………………46
ACCESSORIES………………………………………………………………………………..……..47
QUEST SERVICE AND WARRANTY POLICY……………………………………………………48