Casella CEL CEL-414 - Manual (Page 3)

Contents Page
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. SCHEDULE OF PARTS . . . . . . . . . . . . . . . . . . . . . . 3
3. DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Technical Description . . . . . . . . . . . . . . . . . . . . 4
3.2 Control Facilities . . . . . . . . . . . . . . . . . . . . . . 9
3.3 General Reset . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Display . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5 Auxiliary Outputs . . . . . . . . . . . . . . . . . . . . . 13
3.6 Auxiliary Inputs . . . . . . . . . . . . . . . . . . . . . . 14
3.7 Octave Filters . . . . . . . . . . . . . . . . . . . . . . . 14
3.8 Batteries & Auxiliary Power Supplies . . . . . . . . . . 15
4. PREPARATION FOR USE . . . . . . . . . . . . . . . . . . . . 16
4.1 Battery Installation . . . . . . . . . . . . . . . . . . . . 16
4.2 Fitting Microphones & Preamplifiers . . . . . . . . . . . 17
5. FIELD ACCURACY CHECK (ACOUSTIC CALIBRATION) . . . . 18
6. OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 General Procedures . . . . . . . . . . . . . . . . . . . 21
6.2 Measurement of Sound Pressure Level - SPL . . . . . . 22
6.3 Measurement of One Second Mode - 1SM
(not CEL-266/3, CEL-328/3 or CEL-414/3) . . . . . . . . 22
6.4 Duration of Measurement Period - DUR . . . . . . . . . 23
6.5 Measurement of Maximum Value - L max . . . . . . . . 23
6.6 Measurement of Equivalent Continuous Level - L eq
(not CEL-414/3 or CEL-328/3C) . . . . . . . . . . . . . . 23
6.7 Measurement of Sound Exposure Level - SEL
(not CEL-266/3, CEL-328/3 or CEL-414/3) . . . . . . . . 24
6.7.1 Event Times Determined by Threshold Level
(only CEL-493/3) . . . . . . . . . . . . . . . . . . . . . 24
6.7.2 Events Timed Manually
(not CEL-266/3, CEL-328/3 or CEL-414/3) . . . . . . . . 25
6.8 Measurement of 3 & 5s Cumulative Average - L Tm3 &
L Tm5 (A, B and CEL-493/3) . . . . . . . . . . . . . . . . 26
6.9 Measurement of L OSHA & L DOD (C & D versions) . . . . 26
6.9.1 Setting the Threshold Level . . . . . . . . . . . . . . . 26
6.9.2 L
OSHA & L DOD Measurement . . . . . . . . . . . . . . . 27
6.10 Frequency Analysis Using Built-in Octave Filters
(only CEL-266/3 & CEL-328/3) . . . . . . . . . . . . . . 27
General CEL Sound Level Meters Handbook - Page iii