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Summary of Contents for Simpson 884-2
- Page 1 Simpson Model 884-2 Sound Level Meter OPERATOR’S MANUAL 1.800.561.8187 information@itm.com www. .com...
- Page 2 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.
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Page 3: Table Of Contents
Contents 1. INTRODUCTION ................7 General Description ................7 Specifications ..................7 Items And Accessories Furnished With Instrument ......9 Available Accessories ................ 9 2. INSTALLATION .................. 9 Unpacking And Inspection ..............9 Shipping ................... 10 Service ....................10 Battery Installation Or Replacement ..........10 Installation ..................10 2.5.1 Tripod or Strap Mounting .............. -
Page 4: Introduction
Safety and Health Act of 1970 (OSHA) and the Walsh-Healy Act, except for direct measurement of impact (impulse) noise. The 884-2 can be hand-held for rapid testing or mounted on a tripod for measure- ments over extended periods of time. The meter case is constructed of high- impact molded plastic, especially contoured at the microphone end to minimize reflections of the sound energy field being measured. - Page 5 response times required by the ANSI specification for a Type S2A 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 frequency. Over- shoot response to a suddenly applied steady state signal is less than 0.5 dB.
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Page 6: Items And Accessories Furnished With Instrument
< 0.5 dB. 14. Warm-up Time: Approx. 30 seconds. Items And Accessories Furnished With Instrument All items required to operate the 884-2 are furnished with each Instrument, and are listed in Table 1-2. Table 1-2. Accessories Furnished with Instrument Qty. -
Page 7: Shipping
Battery Installation Or Replacement The 884-2 is powered by a 9-volt alkaline battery. The battery is packaged sepa- rately. To install or replace the battery: Turn the range switch to the "OFF" position. -
Page 8: Application
30 days, remove the battery. APPLICATION This section contains basic information required for effective application of the 884-2 Sound Level Meter, and must be understood before attempting to operate the Instrument for the first time. Decibel Scale... -
Page 9: Sound Fields
also have defined allowable noise (undesirable sound energy) level exposure limits for persons in industrial environments. Selected and applicable parts of those currently in force are cited in this manual. Standards and government regu- latory laws are subject to modification or expansion. Check for latest available documents and information. -
Page 10: Semi-Reverberant Field
For the 884-2 this angle is 70° (refer to Figure 3-2). When making measurements in a reverberant field, orientation of the micro- phone is not critical. -
Page 11: Windscreen
Windscreen When making measurements where wind is present, a low frequency interfer- ence can be introduced by air passing across the microphone. Try to make mea- surements where wind is not present; if this is not practical a windscreen should be employed. -
Page 12: Dual Sound Sources
mation can be made using Figure 3-4 and measurements of the background noise alone and the sound source with the background noise. Simply take the difference between these measurements and locate this difference value of the abscissa of Figure 3-4. Move in a vertical direction from this point to the intersect of the curve and then horizontally to the corresponding ordinate point. -
Page 13: Operating Instructions
Instrument has been subjected to severe me- chanical shock or environmental extremes. Operational Items And Features All items and features used to operate the 884-2 are described in Table 4-1 and illustrated in Figure 4-1. Table 4-1. Operational Items and Features... - Page 14 –10 dB and +10 dB and 1 dB divisions starting from –5 dB. The upper end of the scale includes a BATT OK section. Figure 4-1. Operational Items and Features BATT TEST SLOW FAST (OSHA) 884-2 TYPE S2A SOUND LEVEL METER 1.800.561.8187 information@itm.com www. .com...
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Page 15: Sound Level Measurements
Sound Level Meter in a safe place. Use With Auxiliary Equipment The 884-2 is equipped with three outputs intended to be used with auxiliary equipment such as a chart recorder, oscilloscope or the Simpson 898 Octave Band Filter. These jacks are designed to give the operator more detailed and comprehensive sound analysis study.
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