Lutron Electronics SL-4011 Installation manual

SOUND LEVEL

METER

Model : SL-4011

Your purchase of this

SOUND LEVEL METE

marks a step forward for

you into the field of

precision measurement.

Althou

h this METER is a

complex and delicate

instrument, its durable

structure will allow many

years of use if proper

operatin

techniques are

developed. Please read

the followin

instructions

carefully and always keep

this manual within easy

reach.

OPERATION MANUAL

TABLE

CONTENTS

1. FEATURES...............................................................1

2. SPECIFICATIONS.....................................................

3. FRONT PANEL DESCRIPTION....................................3

3-1 Electric condenser microphone...........................3

3-2 Display.............................................................

3-3 Power switch & Output type selector..................

3-4 A/C weighting & Calibration selector...................3

3-5 Time Weighting ( Fast / Slow ) / Max. hold

selector...........................................................3

3-6 Range selector..................................................3

3-7 Signal output terminal.......................................

3-8 Battery Compartment / Cover............................

3-9 Range upper / lower indicator............................3

3-10 Calibration VR (Accuracy adjust VR)..................3

3-11 Reset Switch for Max. Hold function..................3

4. MEASURING PROCEDURE.........................................4

5. MEASURING CONSIDERATION..................................5

6. SIGNAL OUTPUT......................................................5

7. REPLACEMENT of BATTERY......................................

8. CALIBRATION .........................................................6

9. FREQUENCY WEIGHTING CHARACTERISTICS

OF A & C NETWORKS...............................................7

10. TIME WEIGHTING (FAST & SLOW)

CHARACTERISTICS................................................

1. FEATURES

* Large LCD display, easy to read.

* Main functions are designed to meet IEC 61672 class 2.

* A & C weighting networks are conformity to standards.

* 0.5" standard out size of the microphone.

* Time weighting (Fast & Slow) dynamic characteristic modes.

* AC / DC output for system expansion.

* External calibration VR.

* Condenser microphone for high accuracy & long-term

stability.

* MAX. HOLD function for stored the maximum value.

* Reset switch for Max. Hold function.

* Warning indicator for over and under load.

* LCD display for low power consumption & clear read-out

even in bright ambient light condition.

* Used the durable, long-lasting components, including a

strong, light weight ABS-plastic housing case.

* Small and light weight design allow one hand operation.

2. SPECIFICATIONS

Display 18 mm (0.7") LCD (Liquid

crystal display), 3 1/2 digits.

Function dB (A & C weighting),

Time weighting (Fast, Slow),

Max. hold, AC output, DC output.

Measurement A Weighting- 3 ranges, 30 to 130 dB.

Range C Weighting- 3 ranges, 30 to 130 dB.

* Input Signal only.

Resolution 0.1 dB.

Accuracy * Meet IEC 61672 class 2, tested under

( 23± 5 )℃

Input signal level on 94 dB &

frequency range from 31.5 Hz to

8 k Hz, refer to page 7.

Frequency 31.5 to 8,000 Hz.

Microphone type Electric condenser microphone.

Microphone size Out size, 12.7 mm DIA. ( 0.5 inch).

Weighting Network Characteristics of A & C.

Range selector 3 ranges ( 30 to 80 dB, 50 to 100 dB,

80 to 130 dB ).

* 50 dB on each step,

* with over / under range indicating.

Time weighting Fast - t= 200 ms, Slow - t = 500 ms,

(Fast, Slow) * "Fast" range is simulated the

human ear response time.

* "Slow" range is easy to get the avg.

values of vibration sound level.

* The "Fast" & "Slow" response

range are designed to meet IEC 61672

class 2 requirement.

Calibrator B & K (Bruel & kjaer), MULTIFUCTION

ACOUSTIC CALIBRATOR 4226.

Output Signal AC output -

AC 0.5 Vrms correspond-

ing to each range step.

DC output -

DC 0.3 to 1.3 VDC,

10 mV / per dB.

Output impedance - 600 ohm.

Output terminal 3.5 mm dia. phone output terminal is

provided for connection with analyzer,

level recorder, tape recorder.

Operating Temp. 0 to 50 ( 32 to 122 ).℃℉

Operating Humidity Less than 80% RH.

Power Supply 006P DC 9V battery (heavy duty type).

Power Consump. Approx. DC 6 mA.

Dimension 255 x 70 x 28 mm (10.0x2.8x1.1 inch).

Weight 280 g/0.62 (including battery).

Standard Acc. Instruction Manual .............. 1 PC.

3. FRONT PANEL DESCRIPTION

Fig. 1

3-1 Electric condenser microphone

3-2 Display

3-3 Power switch & Output type selector

3-4 A/C weighting selector

3-5 Time Weighting ( Fast / Slow ) / Max. hold selector

3-6 Range selector

3-7 Signal output terminal

3-8 Battery compartment / Cover

3-9 Range upper / lower indicator

3-10 Calibration VR (Accuracy adjust VR)

3-11 Reset Switch for Max. Hold function

4. MEASURING PROCEDURE

1. Slide the " A/C weighting selector " ( 3-4 ) to " A " or " C "

position for sound level measuring.

Note :

a. The characteristic table of A, C weighting, please

ref. page 7.

b. The characteristic of A weighting is simulated as

the " Human Ear Listening " response.

Typically, if making the environmental sound level

measurement, always select the A weighting typically.

c. The C weighting characteristic is near the " FLAT "

response. Typically, it is suitable for checking the

noise of machinery ( Q.C. check ) & knowing the

real sound level of the tested equipment.

2. Determine proper measuring range by selecting the

" Range selector " ( 3-6 ) to minimize the tolerance of

readout. When left corner of LCD show " "▲

(Range upper / lower indicator, 3-9), it shows the dB

range selection is upper or lower setting. Slide range selector

to other range for measuring.

3. According on various measuring sound source, select the

Time Weighting selector ( 3-5) to " Fast " or " Slow " position.

4. Hold the instrument in hand and point the microphone at

measured noise source, the sound level will be displayed

on " dB " ( decibel) unit.

5. Max. hold - During the sound level measurement, if

need to store the maximum ( peak ) value on display, please

slide the " Time weighting/ Max. hold selector " ( 3-5) to the

" Max. hold " position.

* When measure long-term stability under slowly varying

noise environment, please use the Max. hold function

to read the maximum values.

* Push the " Reset Switch ( 3-11, Fig. 1 ) will reset the

Max. Hold value and execute the Max. Hold function

again.

5. MEASURING CONSIDERATION

1. Please should select the proper weighting selector

( A weighting or C weighting ). Typically the A weighting

selector will be engaged.

2. Please select proper measurements range to minimize

the tolerance of readout.

3. Please don't keep or operate the instrument at high

temperature & humidity environment for a long period.

4. Keep microphone dry & avoid serious vibration.

6. SIGNAL OUTPUT

The instrument is provided an " 3.5 mm dia. phone output "

( 3-7 ) terminal for connection with analyzer, level recorder,

tape recorder, controller...etc.

Slide Power switch & Output type selector ( 3-3) to

AC output or DC output according the user requirement.

7. REPLACEMENT OF BATTERY

1. When the left corner of LCD display show " BAT ",

it is necessary to replace the battery.

However, in-spec. measurement may still be made for

several hours after LOW BATTERY INDICATOR

appears before the instrument become inaccurate.

2. Slide the Battery Cover ( 3-8 ) & take the battery

away from the battery compartment..

3. Replace with 9V battery ( heavy duty type ) and reinstate.

the cover.

8. CALIBRATION

The sound level meter is built in the internal

" Calibration VR " ( 3-10 ) on the front panel.

Please according the following procedures to calibrate

the instrument accurately, if it is necessary.

1. Prepare the optional " SOUND CALIBRATOR, model:

SC-941 or SC-942 ". Power on the Sound calibrator

& plug calibrator output into the " Electric microphone "

( 3-1 ) of the Sound Level Meter.

2. Slide the Range selector ( 3-6) to "50 - 100 dB" position.

3. Slide " Time Weighting selector " ( 3-5 ) to " SLOW "

position.

4. Slide the " A/C weighting & Calibration selector " ( 3-4 )

to " A weighting " position.

5. Carefully adjust the " Calibration VR " ( 3-10 ) with " - "

screw driver, until the display read within " 94.0 ± 0.2 " dB.

9. FREQUENCY WEIGHTING

CHARACTERISTICS OF A & C

NETWORKS

Frequency A Weighting C Weighting Tolerance

Hz Charac. Charac. (IEC 61672 class 2)

31.5 -39.4 dB -3 dB ± 3.5 dB

63 -26.2 dB -0.8 dB ± 2.5 dB

125 -16.1 dB -0.2 dB ± 2.0 dB

250 -8.6 dB 0 dB ± 1.9 dB

500 -3.2 dB 0 dB ± 1.9 dB

1 K 0 dB 0 dB ± 1.4 dB

+1.2 dB -0.2 dB ± 2.6 dB

+1 dB -0.8 dB ± 3.6 dB

-1.1 dB -3 dB ± 5.6 dB

10. TIME WEIGHTING ( FAST and

SLOW) CHARACTERISTICS

Time Weighting Max. response Tolerance

Charac. ref. continuous signal (IEC 61672 class 2)

F ( Fast ) - 1.0 dB + 1 dB

- 2 dB

S ( Slow ) - 4.1 dB ± 2 dB

70711-SL4011-PEAKREST

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