Simpson 886-2 Manuel utilisateur

Simpson Model 886-2

Sound Level Meter

OPERATOR’S MANUAL

About this Manual

To the best of our knowledge and at the time written, the information contained in

this document is technically correct and the procedures accurate and adequate

to operate this instrument in compliance with its original advertised specifica-

tions.

Notes and Safety Information

This Operator’s Manual contains warning symbols which alert the user to check

for hazardous conditions. These appear throughout this manual where appli-

cable, and are defined below. To ensure the safety of operating performance of

this instrument, these instructions must be adhered to.

Warning, refer to accompanying documents.

Caution, risk of electric shock.

This instrument is designed to prevent accidental shock to the operator when

properly used. However, no engineering design can render safe an instrument

which is used carelessly. Therefore, this manual must be read carefully and com-

pletely before making any measurements. Failure to follow directions can result

in a serious or fatal accident.

Technical Assistance

SIMPSON ELECTRIC COMPANY offers assistance Monday through Friday

8:00 am to 4:30 pm Central Time. To receive assistance contact Technical Sup-

port or Customer Service at (715) 588-3311.

Internet: http://www.simpsonelectric.com

Warranty and Returns

SIMPSON ELECTRIC COMPANY warrants each instrument and other articles

manufactured by it to be free from defects in material and workmanship under

normal use and service, its obligation under this warranty being limited to making

good at its factory or other article of equipment which shall within one (1) year

after delivery of such instrument or other article of equipment to the original

purchaser be returned intact to it, or to one of its authorized service centers, with

transportation charges prepaid, and which its examination shall disclose to its

satisfaction to have been thus defective; this warranty being expressly in lieu of

all other warranties expressed or implied and of all other obligations or liabilities

on its part, and SIMPSON ELECTRIC COMPANY neither assumes nor autho-

rizes any other persons to assume for it any other liability in connection with the

sales of its products.

This warranty shall not apply to any instrument or other article of equipment

which shall have been repaired or altered outside the SIMPSON ELECTRIC

COMPANY factory or authorized service centers, nor which has been subject to

misuse, negligence or accident, incorrect wiring by others, or installation or use

not in accord with instructions furnished by the manufacturer.

NOTES

Contents

1. INTRODUCTION .................................................................................. 7

1.1 General Description ........................................................................... 7

1.2 Specifications ..................................................................................... 7

1.3 Items Furnished With The Instrument ................................................. 9

1.4 Available Accessories ........................................................................ 9

2. INSTALLATION ................................................................................ 10

2.1 Unpacking And Inspection ...............................................................10

2.2 Shipping ...........................................................................................10

2.3 Service .............................................................................................. 10

2.4 Battery Installation Or Replacement ................................................ 10

2.5 Installation ........................................................................................10

2.5.1 Tripod or Strap Mounting .................................................................. 10

2.5.2 Remote Microphone Mounting ......................................................... 10

2.6 Care ..................................................................................................11

3. APPLICATION ................................................................................. 11

3.1 Decibel Scale ...................................................................................11

3.2 Measurement And Exposure Standards ..........................................11

3.3 Sound Fields ....................................................................................13

3.3.1 Free Field .......................................................................................... 13

3.3.2 Reverberant Field ............................................................................. 13

3.3.3 Semi-Reverberant Field ................................................................... 13

3.4 Microphone Orientation ....................................................................13

3.5 Effect Of Operator’s Presence ..........................................................14

3.6 Windscreen ....................................................................................... 14

3.7 Meter Fluctuations ............................................................................ 15

3.8 Selecting A Weighting Characteristic ...............................................15

3.9 Impact Noise ..................................................................................... 15

3.10 Background Noise ............................................................................16

3.11 Dual Sound Sources ........................................................................16

4. OPERATING INSTRUCTIONS ......................................................... 16

4.1 Precautions ....................................................................................... 17

4.2 Operational Items And Features ......................................................17

4.3 Sound Level Measurements ............................................................19

4.4 Use With Auxiliary Equipment ..........................................................20

NOTES

1. INTRODUCTION

1.1 General Description

The Simpson 886-2 Sound Level Meter (hereafter referred to as the 886-2 or the

Instrument) is a portable, general purpose sound level instrument, capable of

accurate sound level measurements over a range of 40 to 140 dB. This encom-

passes the noise level of a quiet residence to that beyond the threshold of pain.

This dB range is compatible with current Federal, State, and local noise ordi-

nance requirements; including safety and environmental noise checks.

The 886-2 meets the requirements of the American National Standards Institute

(ANSI) Standard Specification S1.4 - 1983 for “Type 2 General Purpose Sound

Level Meters and the International Electro-Technical Commission (IEC) 651.” It

can be used by industry to measure noise levels to comply with Occupational

Safety and Health Act of 1970 (OSHA) and the Walsh-Healy Act, except for direct

measurement of impact (impulse) noise.

The 886-2 can be hand-held for rapid testing or mounted on a tripod for measure-

ments over extended periods of time. The microphone is detachable and can be

extended from its case by use of an optional 25-foot microphone extension cable.

The meter case is constructed of high-impact molded plastic, especially con-

toured at the microphone end to minimize reflections of the sound energy field

being measured.

The 886-2 is equipped with a range selector switch which references the 0 dB

point of the indicating instrument to the range selected. For example, when the

range switch is set to 70, the zero (0) mark on the black arc is equal to 70 dB.

Push-button switches provide quick, direct selection of “A”, “B” or “C” weighting

networks and a battery check function. Fast or slow meter response is switch

selectable.

The 886-2 offers three outputs which are proportional to the sound level input; a

RMS output, a dB output, and an external filter output that is compatible with the

Simpson 898 Octave Band Filter.

1.2 Specifications

The specifications for the 886-2 are listed in Table 1-1.

Table 1-1. Specifications

1. Microphone: The microphone is a condenser type with the size

as type L per ANSI S1.12 - 1967. The nominal

electrical impedance is 350 ⍀, 20% @ 23°C. The

microphone is omnidirectional; its angle of inci-

dence which approximates random incidence

response is 70°.

2. Sound Level: Measurement Ranges: 40 dB to 140 dB. Zero (0)

dB reference is 20 μPascals. Maximum SPL: 140

dB SPL for linearity within 1 dB.

3. Accuracy: Meets ANSI S1.4 - 1983 for a Type 2 instrument.

4. Weighting: Three selectable networks modify overall fre-

quency response to meet the ANSI specification

for the A, B, or C weighting curves for a Type 2

instrument. The “External Filter” jack may be used

to obtain a flat response.

5. Meter: Pivot and Jewel movement with 2-1/2” dial

having end markings of -10 dB and +10 dB, and

fifteen 1 dB scale markings. From -5 dB to +10 dB

the accuracy and scale markings comply with the

ANSI specification for a Type 2 instrument.

6. Speed of Response: Types of response: Selectable “Slow” or “Fast” re-

sponse times meet the exponential-time-averag-

ing characteristic required by the ANSI specifica-

tion for a Type 2 instrument.

SLOW Response: Response to a 500 millisecond tone burst of 1000

Hz is nominally 2.5 dB down from a reference

steady state signal at the same level and fre-

quency. Overshoot response to a suddenly ap-

plied steady state signal is less than 0.5 dB. When

an applied signal is turned off, the decay rate is

less than 3 seconds per 10 dB.

FAST Response: Response to a 200 millisecond tone burst of 1000

Hz is nominally 2.0 dB down from a reference

steady state signal at the same level and fre-

quency. Overshoot response to a suddenly ap-

plied steady state signal is less than 0.5 dB. When

an applied signal is turned off, the decay rate is

less than 0.5 seconds per 10 dB.

7. Linearity: Primary indicator range is from 0 dB to +10 dB on

each range. Overall indicator range is -5 dB to

+10 dB. The dedicated “OSHA” range primary

indication is +105 dB to +115 dB, with an overall

indication of +100 dB to +115 dB. Within these

limits, the primary indicator accuracy is .1 dB and

the overall accuracy is 1.5 dB.

8. Calibration: Recommended calibration frequency is 1000 Hz

at sound pressure levels of either 94 dB on the 90

dB range, or 114 dB on the 110 dB range. Cali-

bration is screwdriver adjustable from side of case.

9. Output Connections: This Instrument is equipped with three outputs:

External Filter, RMS Output, and dB Output.

External Filter: Provides non-weighted (flat response) output of

120 mV RMS, at meter reading of +10 dB, into a

100 K⍀load; a lower impedance may affect the

meter reading. This output is not affected by the

“Fast-Slow” setting. The recommended plug is

Switchcraft’s #750 (0.141" diameter).

RMS Output: Provides weighted or non-weighted output of 1.00

V RMS, at a meter reading of +10 dB, into a 100

K⍀load; a lower impedance will not affect the

meter reading. This output is not affected by the

“Fast-Slow” setting. The recommended plug is

Switchcraft’s #850 (0.097" diameter).

dB Output: Provides logarithmic output of +1.50 V DC, at a

meter reading of +10 dB, into a 100 K⍀load; a

lower impedance will not affect the meter read-

ing. The response time of this output is set by the

“Fast-Slow” setting. The exponential-time-aver-

aging time constant is per ANSI S1.4 - 1983, para-

graphs 6.2 and 6.3: Slow is 1000 milliseconds,

and Fast is 125 milliseconds. The recommended

plug is Switchcraft’s #850 (0.097" diameter).

10. Power Requirements: One 9-volt alkaline battery, NEDA 1604A (or

equal) will typically provide 40 hours of continu-

ous operation.

11. Temperature Range:

Operating Temperature: -10°C to +50°C.

Storage Temperature: -40°C to +60°C with the battery removed.

12. Temperature influence: Typically 0.015 dB/°C at 1kHz.

13. Operating Humidity: 0 to 90% relative humidity (non-condensing) for

a reading change of < 0.5 dB.

14. Warm-up Time: Approx. 30 seconds.

1.3 Items Furnished With The Instrument

All items required to operate the 886-2 are furnished with each Instrument, and

are listed in Table 1-2.

Table 1-2.

Quantity Description Part Number

1 9-volt batteryNEDA 1604A*

1 Operator’s Manual 6-115308

*Available from local retail stores.

1.4 Available Accessories

Available accessories are listed in Table 1-3.

Table 1-3.

Description Part/Catalog Number

Screwdriver 5-116470

Windscreen 00197

Calibrator, 890-2 12890

Package Case 10-866065

Adapter, Microphone to Tripod 00184

Microphone Extension Cable 00198

Microphone Assembly 00183

898 Octave Band Filter Set 02231

2. INSTALLATION

This section contains information and instructions for the packaging and ship-

ping of the 886-2. Included are procedures for unpacking and inspection, ser-

vice, shipping, battery installation, installation and care.

2.1 Unpacking And Inspection

Examine the shipping carton for obvious sign of damage. If shipping carton is in

good condition, inspect the Instrument for possible damage incurred during ship-

ment. If damaged, notify the carrier and supplier and do not attempt further use of

the Instrument. If the Instrument appears to be in good condition, read Operator’s

Manual in its entirety. Become familiar with the Instrument as instructed in the

manual, then proceed to check the electrical performance as soon as possible.

2.2 Shipping

Pack the Instrument carefully and ship it prepaid to the proper destination. Insure

the Instrument. Save the shipping carton and packing materials for future storing

or shipping of the Instrument.

2.3 Service

This Instrument contains no operator serviceable parts, except for the battery.

Refer all service requests to the Simpson factory. If the Instrument is covered by

warranty, include the model number, serial number, and date of purchase.

2.4 Battery Installation Or Replacement

The 886-2 is powered by a 9-volt alkaline battery. The battery is packaged sepa-

rately. To install or replace the battery:

a. Turn the range switch to the “OFF” position.

b. Using the screwdriver or coin, loosen the two screws located on the battery

cover access compartment and remove the cover.

c. Install or replace the battery with the connector on the left side of the Instru-

ment. Route the cable between the battery and upper wall of the battery

compartment.

2.5 Installation

The Instrument, when in operation, may be either hand-held or mounted on a

tripod. The physical position of the Instrument does not affect the accuracy.

2.5.1 Tripod or Strap Mounting

The 886-2 can be attached to any commercial, photography-type tripod having a

standard 1/4-20" mounting screw. The mounting screw is aligned with the threaded

insert in the case and finger-tightened. A camera-type carrying strap can be

attached to the threaded insert. Carry the Instrument with the strap around the

wrist to prevent accidental dropping.

2.5.2 Remote Microphone Mounting

A remote cable and microphone adapter can be used to mount the microphone to

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