SKC SoundCHEK Manual de usuario

skcinc.com Form 37177 Rev 200910 Page 1

SoundCHEK Essential Sound Level Meter

Cat. Nos. 702-001 and 702-002

Operating Instructions

Table of Contents

Introduction....................................................................................................................................................4

Checking Kit Contents...............................................................................................................................4

Parameters and Features..........................................................................................................................4

Microphone and Preamplifier.....................................................................................................................4

Removing the Microphone.....................................................................................................................4

Attaching/Removing the Preamplifier ....................................................................................................5

Certifiable Calibration ................................................................................................................................5

1/2-inch

microphone with

windscreen

Soft Key 1

Screen

Soft Key 2

Battery

compartment

(on back)

Arrow keys

(left/right, up/down)

Record/Stop

Power on/off key,

reset, screen grab

Figure 1. SoundCHEK Essential Overview

skcinc.com Form 37177 Rev 200910 Page 2 
 
 
 
Measuring Sound ......................................................................................................................................5 
Sound Level –General Recommendations...........................................................................................5 
Reflections .............................................................................................................................................6 
Time Weighting......................................................................................................................................6 
Frequency Weighting Filters..................................................................................................................6 
Overload and Under Range...................................................................................................................8 
Getting Started............................................................................................................................................10 
Using the Keypad....................................................................................................................................10 
Powering the Sound Level Meter ............................................................................................................10 
Determining Battery Level.......................................................................................................................10 
Turning Power On/Off..............................................................................................................................11 
Interpreting Instrument Icons...................................................................................................................12 
Operation.....................................................................................................................................................13 
Real Time Mode ......................................................................................................................................13 
Recording Mode ......................................................................................................................................13 
Recording Screen Display ...................................................................................................................13 
Time History Disabled..........................................................................................................................14 
Time History Enabled...........................................................................................................................14 
Time History Disabled, Duration Timer Set .........................................................................................14 
Time History Enabled, Duration Timer Set..........................................................................................15 
Stop Active Recording .........................................................................................................................15 
File Review Mode....................................................................................................................................15 
Auto Playback......................................................................................................................................16 
Menu Structure........................................................................................................................................17 
Menu Navigation and Settings ................................................................................................................18 
Measurement Setup.............................................................................................................................18 
File Manager........................................................................................................................................22 
Load File ..............................................................................................................................................23 
Delete File............................................................................................................................................24 
Delete All Files.....................................................................................................................................24 
Auto Playback......................................................................................................................................24 
Templates ............................................................................................................................................25 
Instrument Setup..................................................................................................................................25 
Date......................................................................................................................................................26 
Time.....................................................................................................................................................26 
Bar Levels............................................................................................................................................27 
Language.............................................................................................................................................28 

skcinc.com Form 37177 Rev 200910 Page 3 
 
 
 
Calibration............................................................................................................................................28 
View History.........................................................................................................................................29 
Information...........................................................................................................................................31 
Measurement Screens ............................................................................................................................31 
Measurements .....................................................................................................................................32 
Measurements Table...........................................................................................................................33 
Exposure..............................................................................................................................................33 
Percentiles (LN)....................................................................................................................................34 
Accessories/Replacement Parts.................................................................................................................35 
Appendix A: Performance Profile................................................................................................................36 
 
 

skcinc.com Form 37177 Rev 200910 Page 4

INTRODUCTION

Checking Kit Contents

If you ordered Cat. No.

Your package should contain

702-001

Class 1 meter, rubber boot, 4 AA batteries USB cable, wrist strap, windscreen, and

USB drive with manual, in a protective carry case

702-002

Class 2 meter, rubber boot, 4 AA batteries USB cable, wrist strap, windscreen, and

USB drive with manual, in a protective carry case

Parameters and Features

Template: All Parameters

Measurement 1:

LEQ, LMIN, LMAX, LE, LEP’d, LAVG, % Dose, % Dose per Hour, Exposure (Pa2h), TWA, L10, L90,

(L1, L5, L50, L95 or L99)

Measurement 2:

LEQ, LMIN, LMAX, LPEAK

Template: Environmental

Measurement 1:

LEQ, LMIN, LMAX, LE, L10, L90, (L1, L5, L50, L95 or L99)

Measurement 2:

LEQ, LMIN, LMAX, LPEAK

Template: Noise at Work

Measurement 1:

LEQ, LMIN, LMAX, LE, LEP’d, LAVG, % Dose, % Dose per Hour, Exposure (Pa2h), TWA

Measurement 2:

LEQ, LMIN, LMAX, LPEAK

Microphone and Preamplifier

Removing the Microphone

The microphone is fitted to the preamplifier by screwing the microphone in a clockwise direction ensuring

that the preamplifier spring pin is located centrally in the microphone.

To remove the microphone, unscrew in a counterclockwise direction.

The microphone has a protection grid which can also be unscrewed and removed, great care must be

taken to ensure that this is NOT removed.

Underneath the protection grid is the microphone diaphragm, which should never be

touched or be subject to dust or dirt. Doing so may damage the microphone beyond

repair or affect its acoustic response dramatically.

skcinc.com Form 37177 Rev 200910 Page 5

Attaching/Removing the Preamplifier

To attach the preamplifier (see below), position the RED orientation key on the preamplifier with the RED

identification mark on the sound level meter and gently push the preamplifier into the connector.

To remove, gently pull the preamplifier stem away from the instrument body.

Certifiable Calibration

The calibration process includes the microphone, preamplifier and sound level meter. Any change in this

measurement chain will require a new calibration certificate.

SKC offers a complete calibration service offering a NIST calibration that can be supplied with or without

a test report.

It is recommended that your sound meter instrumentation is calibrated annually to ensure your measuring

equipment is completely accurate and fully compliant.

Measuring Sound

•Always calibrate your SoundCHEK Essential sound level meter prior to and after taking

measurements using an SKC AcoustiCHEK Calibrator Cat. No. 703 Series.

Sound Level –General Recommendations

In some environments, high levels of noise can occur. The SoundCHEK Essential sound level meter has

been designed for complete accuracy up to sound levels of 140 dB.

Before you record measurements, take the time to ensure you have chosen the optimum range for the

application. Wherever possible, the optimum range is when the average measured signal is

approximately halfway between the top of the range and the bottom of the range without an overload

condition.

Preamplifier

Microphone

Only pull out and plug

in the preamplifier.

DO NOT TWIST

skcinc.com Form 37177 Rev 200910 Page 6

The SoundCHEK Essential will register an overload if the noise level exceeds the linear operating range

of the range selected by 0.5 dB, so it is advisable to determine if an overload will occur on the selected

range before measuring. In such cases, you will need to select a higher range to accommodate the higher

peak levels.

If the noise levels are 0.1 dB too low for the range selected, then the meter will display an under range

condition. Under these circumstances, you will need to select a lower range. For detailed information, see

Measurement Setup, Weightings & Range.

If measuring low level noise, be aware of the inherent noise levels caused by a combination of thermal

and electrical noise from both the microphone and the sound level meter. Measuring data that lies within

10 dB of the lowest quoted level on the lowest measuring range may be influenced by the self-noise of

the system.

Reflections

The sound level meter operator and the sound level meter itself can interfere with the measurements

being made, reflecting the noise signal. The instrument case for all SKC sound level meters has been

designed to minimize reflections while also being of rugged construction.

To minimize reflections from the operator, hold the sound level meter at arm’s length or mount the sound

meter on a suitable tripod.

Time Weighting

The time weighting is a time constant that modifies the response of the instrument to fluctuating noise

levels. Without time weighting the meter display would fluctuate following the measured noise level and

would be unreadable, the selected time weighting therefore softens these fluctuations over the time

periods described below and in doing so the meter has a more readable display.

All SoundCHEK Essential sound level meters use digital time weighting filters for higher accuracy. The

following standardized time weightings are available:

•Slow Weighting shows a slow rise in the Sound Pressure Level even for a sharp rise in the noise

level, likewise a rapid reduction in noise will be shown as a slow decrease in Sound Pressure

Level. The rise and fall times applied for Slow Weighting are 1 second.

•Fast Weighting is the most commonly used time weighting. It follows the noise level closer than

slow weighting by displaying a fast rise and fall in the Sound Pressure Level. The rise and fall

times applied for Fast Weighting are 125 milliseconds.

•Impulse Weighting allows your meter to show rapid rises in the noise level but has a very slow

decay. The rise and fall times for Impulse Weighting are 35 milliseconds and 1.5 seconds,

respectively.

Frequency Weighting Filters

Frequency Weightings are where the Sound Pressure Level is modified by use of filtering. All

SoundCHEK Essential sound level meters use digital frequency weighting filters for higher accuracy. The

following standardized frequency weightings are available; the frequency weighting curve for each one is

shown in the graph below.

skcinc.com Form 37177 Rev 200910 Page 7

A Weighting

The SPL is filtered in such a manner as to reflect the hearing response of a human ear. The signal is

progressively attenuated at the higher and lower ends of the audible frequency range but much more

attenuation occurs at the lower end of the audible frequency range. Generally, this is the most commonly

used frequency weighting.

C Weighting

The signal is progressively attenuated at the higher and lower ends of the audible frequency range,

however, the attenuation at the lower end is much less than with A Weighting. The response has a flat

area between 200 and 1250 Hz and has -3 dB points at 31.5 Hz and 8kHz. It is generally used for the

acoustic emissions of machinery and for peak sound levels.

Z Weighting

Often referred to as the FLAT or LIN response, this weighting has a virtually flat response over the entire

audible frequency range.

Z Weighting

A Weighting

C Weighting

-60

-50

-40

-30

-20

-10

10 100 1000 10000 100000

Frequency

Frequency Weighting Curves

skcinc.com Form 37177 Rev 200910 Page 8

Overload and Under Range

As mentioned in Sound Level –General Recommendations, the SoundCHEK Essential will register an

overload if the noise level exceeds the current measurement range and will register under range if the

noise levels are too low for the current range.

The SoundCHEK Essential will display these events as “OL” (overload) and “UR” (under range) in bold

red lettering or inside a red box. They will always be displayed in the same place on each measurement

screen. See the table on the next page.

Under range on each measurement acts independently and under some conditions may display under

range on only one measurement. Overload does not act this way and will display an overload for both

ranges.

During overload or under range conditions, the bar displayed at the bottom of the measurement home

screen will change to grey, indicating that operation is outside of the current range.

skcinc.com Form 37177 Rev 200910 Page 9

Overload

Under Range

skcinc.com Form 37177 Rev 200910 Page 10

GETTING STARTED

Using the Keypad

Powering the Sound Level Meter

The sound level meter can be powered from four 1.5V AA size batteries, four 1.2V

rechargeable batteries, or the micro USB connection via a USB port or power supply

capable of delivering 0.5 A.

The battery compartment is located on the back of your sound meter. Remove the

battery door and insert the batteries using the correct polarity shown where the

batteries are fitted (see right).

Replace the battery door securely before using the instrument.

Determining Battery Level

The SoundCHEK Essential is equipped with a multi-level battery indicator:

Soft Key 2

(Home/Filter/

Select Yes)

Soft Key 1

(Menu/Select

No/Exit/Back)

Directional

arrow keys: up,

down, left, right

OK, Record/Stop

Power, reset, or

screen grab

100%

20%

10%

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