Extech Instruments 407727 Manuale utente

User’s Manual

Model 407727

Digital Sound Level Meter

Introduction

Congratulations on your purchase of Extech’s Digital Sound Level Meter. This professional meter, with proper

care, will provide years of safe reliable service.

Specifications

Measurement ranges Auto range from 40 to 130dB ('A' Weighted)

Auto range from 45 to 130dB ('C' Weighted)

Resolution 0.1 dB

Accuracy ±2 dB at 94 dB sound level

Display 3 1/2 digit LCD with analog bargraph

Display update rate 160ms (LCD), 40ms (bargraph)

Time weighting Fast / Slow Response (selectable)

Frequency weighting 'A' and 'C' weighting (selectable)

Analog output AC: 0.707Vrms

Microphone type Condenser Electret

Power Meter powered by 9V battery ;120 hour battery life

Dimensions/Weight 2.7x7.1x1.4" (68 x 180 x 36mm) / 5.1 oz. (160g)

Front Panel Description

1Microphone

2LCD Display

3Analog Bargraph Display

4ON/OFF key

5Range key

6A/C Weighting selection key

7Min/Max Record key

8 Fast/Slow selection key

9Maximum Hold activation key

Note:Battery compartment and Tripod mount are on the rear of the meter.

The Analog output jack is located on the left side of the meter.

Operation

LCD Display with Analog Bargraph

Sound levels are displayed both digitally and in bargraph format. When the ON/OFF key is pressed to

power the meter, the LCD will display all characters and then it will count down to zero. After countdown,

the meter dipslays sound pressure levels (SPL) in units of dB. Point the microphone toward the source of

the sound being measured, and read the measurement on the LCD.

Auto and Manual Ranging

The default mode of operation is Auto Range. To manually select a range, press the RANGE key (‘MANU’

will appear on the LCD). Press the RANGE key until the desired range is displayed. Note that the two-digit

number to the left of the bargraph changes to reflect the new range.

Tripod Mount

A threaded insert on the rear of the meter permits attachment to a tripod stand for increased stability and

accuracy (eliminates hand noise and minimizes the effects of sound reflected from the user's body).

Weighting A / C

Press the Weighting key to select A or C weighting. The LCD will reflect which weighting mode is currently

selected. Use ‘A’ weighting to have the meter respond as the human ear would with regard to frequency

response (the human ear boosts and cuts amplitude over the frequency spectrum therefore it is not ‘flat’

responding). ‘A’ weighting is used for environmental measurements, OSHA regulatory testing, law

enforcement, and workplace design. Select ‘C’ weighting for a flatter response measurement (especially

for lower frequencies). ‘C’ weighting is suitable for the sound level analysis of machines, engines, etc.

Fast (F) and Slow (S) Response

Press the Fast or Slow key to select the response. The LCD will reflect the currently selected mode.

Selection of Fast or Slow is determined by the application and any directives or standards related to that

application. For example, most hearing conservation or OSHA related testing is done using SLOW and A

weighting.

Maximum Hold

Press the Max Hold key to display the maximum reading during the measurement period. In the Max

position, the LCD will hold the highest reading measured and will update only if a higher reading is

measured. The bargraph will continue normal measurements. Press the key again to return to normal

operation.

Low Battery Indication

If the low battery icon ‘BAT’ appears on the display, replace the 9V battery as soon as possible. See the

battery replacement section for further information.

Analog Output

A 3.5mm phono output jack is provided on the meter for connection to external test equipment. An AC rms

voltage is provided (0.707V maximum) which is a linearized representation of the analog pointer reading.

Connect this output to a datalogger, chart recorder, etc. for datalogging purposes.

Data Recording

To begin recording the MIN and MAX sound level readings, press the RECORD key (REC will appear on

the LCD). To recall the stored minimum reading, press the RECORD key again (MIN will appear on the

LCD along with the recorded measurement data). To view the stored maximum reading, press RECORD

again. To resume normal meter operation, press RECORD key a final time. NOTE: The bargraph displays

continues to work while in the Data Recording mode.

Auto Power Off

The meter automatically shuts down after 20 minutes of non-use to preserve battery life. To override this

feature, press the ON/OFF and MAX HOLD keys simultaneously from a power off condition. When the

display appears release only the MAX HOLD key (a lower case ‘n’ will appear on the LCD). Now Release

the ON/OFF key. Note: The Auto Power Off feature will be re-activated the next time the meter is manually

powered down.

Battery replacement

Remove the battery compartment cover on the rear of the meter by removing the cover screw. Replace 9V

battery and compartment cover.

Typical A Weighted Sound Levels

50HP Siren (100’) 135db Speech (1’) 68dB

Jet Takeoff (200’) 120dB Large store 62dB

Riveting machine 110dB Large office 58dB

Chain saw 100dB Residence 48dB

Subway (20’) 90dB Night residential area 42dB

Freight train (100’) 80dB Whisper (5’) 32dB

Vacuum cleaner (10’) 72dB Sound studio 24dB

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year

from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the

instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 for

authorization. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is

responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit.

This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of

specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or

merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other

warranty, whether written or oral, is expressed or implied

in whole or in part in any form.

407727 V1.2 10/00

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