Extech Instruments 407790A Manual de usuario

User Manual

Real Time Octave Band Analyzer

Model 407790A

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Table of Contents

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1. Introduction

Congratulations on your purchase of the Extech 407790A Real Time Octave Band

Analyzer. This auto ranging Type 2 integrating sound level meter features 1/1 and 1/3

Octave Band real-time noise analyses. The 407790A offers five measurement

parameters: SPL (Sound Pressure Level), Leq (Equivalent Continuous 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 software and USB cable. This meter permits

choice of , or Flat and Slow / Fast /impulse response times. 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.

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1.1 Instrument Care

Do not attempt to remove the mesh cover from the microphone as this will cause damage

and affect the accuracy of the instrument.

Protect the instrument from impact. Do not drop it or subject it to rough handling.

Transport it in the supplied carrying case.

Protect the instrument from water, dust, extreme temperatures, high humidity and direct

sunlight during storage and use.

Protect the instrument from air with high salt or sulfur content, gases and stored chemicals,

as this may damage the delicate microphone and sensitive electronics.

Always switch the instrument off after use. Remove the batteries from the instrument if it

is not to be used for a long period of time. Do not leave exhausted batteries in the

instrument, as they may leak and cause damage.

Clean the instrument only by wiping it with a soft, dry cloth or, when necessary, with a cloth

lightly moistened with water. Do not use solvents, abrasives, alcohol or cleaning agents

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1.2 Features

The Sound Level Meter complies with the requirements of IEC 61672-1:2003 standard for a

Class 2 instrument. See specifications section for more applicable standards that apply to this

meter.

1/1 octave band analysis from 31.5Hz to 8kHz

1/3 octave band analysis from 25Hz to 10kHZ

Can perform 1/1 and 1/3 octave band analysis simultaneously

4GB Micro SD card

USB interface

Datalogging function

AC/DC signal output available for level and graphic recorder

Comparator output function

External trigger input function

Real time clock with calendar

Main channel (sound meter, analyzer mode)

Sub Channel (sound level meter mode)

The 407790A allows the following quantity measurements.

Simultaneous measurements of all items with selected time weighting and frequency

characteristics.

Sound level Lp

Equivalent continuous sound Leg

Sound exposure level SEL

Maximum sound level Lmax

Minimum sound level Lmin

Percentile sound level LN (L05, L50, L90, L95) calculated from Lp

Frequency rating A, C, Z

Time weighting

Main Channel Fast, Slow, 10ms, impulse

Sub Channel Fast, Slow, 10ms, impulse

Safety Symbol: Complies with EMC

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2. Descriptions

2.1 Meter Description

Refer to the diagram below for the following descriptions.

1. Windscreen

2. Microphone

3. Display

4. Operation keys

5. 6VDC adapter jack

6. DC analog output jack

7. AC analog output jack

8. Comparator output jack

9. Trig IN jack

10. Micro SD card slot

11. Power switch

12. Hand strap

13. USB port

14. Battery compartment

15. Tripod mounting screw

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2.2 Operation Buttons

START/STOP button

Press to start or stop for recording the sound pressure measurement.

PAUSE/CONT button

Press to temporarily pause ( ) a measurement) or resume ( ) measurement.

M button

Press to scroll through and select different processing modes.

LEVEL

Press to select the level range for measurement. The following five settings are available.

20 to 90 dB, 20 to 100 dB, 20 to 110 dB, 30 to 120 dB, 40 to 130 dB.

GRP/ NUM button

Press to switch between graph and numeric display for Octave measurements.

SLM 1/1 1/3 button

Press to switch to select the sound level meter display and analysis screen.

(SLM, 1/1, 1/3, 1/1&1/3)

Press to enter menu screen to setup various menu parameters. Press again to close the

menu.

R button

Start or stop the auto Record process or press to manually store the measurement data

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into memory.

Press to move the octave frequency band marker during frequency analysis.

FREQ WEIGHT TIME button

ponse (Z).

The TIME WEIGHT selects the time weighting function for the main channel. (F, S, 10ms, I)

Fast: 125ms; Slow: 1000ms; 10ms; Impulse: 35ms

Note: The frequency and time weighting for the sub channel can be selected by accessing

the menu screen.

button (Backlight/Enter)

Backlight powers on the display backlight. Press the button again to turn backlight off.

When automatic Backlight Off function is selected from the menu screen, the backlight will

turn itself off automatically after the preset time.

Enter button will finalize a setting of an item in a menu or any other setting.

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2.3 Display Screen

2. Measurement in progress: When a measurement recording is in progress or during auto store

the symbol flashes. During measurement pause the

3. USB Link Status: Shows if the USB is enabled or disabled.

4. Trigger Mode: Controls the measurement and memory auto store start behavior. Available

modes are: Level 1 (LV1), Level 2 (LV2), EXT (EXT), and time (TIME).

5. Elapsed Time: Displays the elapsed time in seconds during processing and storing memory.

Mode of analysis

Measur

ement in pr

ogr

ess s

ymbol

USB link status

Trigger mode

Elapsed time

Memory

Store mode

Address

Level range

Overload indication

Sub channel level displa

Sub channel

Time weighting

equency weighting

Current time

Current date

Comparator ON

Auto store full indication

Manual store full indication

Power

status

Main channel level

display

Time weighting

Main channel

Frequency weighting

Under

range indication

Bar graph

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