Extech 407790A Bruksanvisning

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User Manual
Real Time Octave Band Analyzer
Model 407790A
Addional User Manual Translaons available at www.extech.com
2 407790A-EN_V2.4 1/20
Table of Contents
TABLE OF CONTENTS .......................................................................................... 2
1. INTRODUCTION ................................................................................................ 3
1.1 Instrument Care ............................................................................................ 4
1.2 Features ........................................................................................................ 5
2. DESCRIPTIONS ................................................................................................ 6
2.1 Meter Description .......................................................................................... 6
2.2 Operation Buttons ......................................................................................... 8
2.3 Display Screen ............................................................................................ 10
2.4 Analysis screen ........................................................................................... 12
2.5 Numeric Display screen .............................................................................. 13
3. MEASUREMENT PREPARATION AND SETUP ............................................ 15
3.1 Setting the Date and Time .......................................................................... 15
3.2 SD Memory Card ........................................................................................ 17
3.3 Setting the Backlight Auto Off time ............................................................. 17
3.4 Sub Channel Settings ................................................................................. 18
3.5 Selecting the Lmax/Lmin type .................................................................... 19
3.6 Comparator Output Operation .................................................................... 20
3.7 Trigger Mode Setup and Operation ............................................................ 23
4. MEASUREMENTS ........................................................................................... 27
4.1 Sound Level Measurements ....................................................................... 27
4.2 SEL, Leq, Lmax, Lmin, LN Measurements ................................................. 28
4.3 Sound Level and Octave Band Analysis Measurement ............................. 30
4.4 Sound Band - Leq, SEL, Lmax, Lmin and LN Analysis Measurement ....... 32
5. STORING DATA TO MEMORY ....................................................................... 34
5.1 Manual Memory Storage ............................................................................ 34
5.2 Recalling Manually Stored Data ................................................................. 37
5.3 Erasing Manually Stored Data .................................................................... 39
5.4 Auto 1 Memory Storage .............................................................................. 40
5.5 Auto 2 Memory Storage .............................................................................. 44
5.6 Erasing Auto Stored Data ........................................................................... 45
6. SOFTWARE DOWNLOAD AND INSTALLATION .......................................... 47
7. SOUND PRESSURE LEVEL - TECHNICAL NOTES ..................................... 48
8. CALIBRATION ................................................................................................. 49
9. SPECIFICATIONS ........................................................................................... 50
10. TWO-YEAR WARRANTY ................................................................................ 53
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1. Introducon
Congratulaons on your purchase of the Extech 407790A Real Time Octave Band
Analyzer. This auto ranging Type 2 integrang sound level meter features and 1/1 1/3
Octave Band real-me noise analyses. The 407790A oers ve measurement
parameters: SPL (Sound Pressure Level), Leq (Equivalent Connuous Sound Pressure
Level), SEL (Sound Exposure Level), Lmax (Maximum Sound Pressure Level), and Lmin
(Minimum Sound Pressure Level). The built-in memory stores 12,280 data records in
sound level mode and 1024 records in Octave mode The stored data can be easily .
transferred to a PC with the 407790A soware and B cable This meter permits US .
choice of Flat ‘A’, ‘C’, or ’Z’ weighting and Slow / Fast /impulse response mes AC and .
DC analog output signals are available for chart recorders and other external recording
devices. Careful use of this device will provide years of reliable service.

Produktspecifikationer

Varumärke: Extech
Kategori: Ljudnivåmätare
Modell: 407790A

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