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Summary of Contents for az-instrument 8921
- Page 1 Digital Sound Level Meter Model: 8921 8922...
- Page 2 INTRODUCTION Your digital sound level meter provides automatic or manual ranging in six meas-urement ranges from 30 to 130dB. The unit meets ANSI S1.4 and IEC 651 Type 2 standards, and features 0.1dB resolution. A background noise absorber permits you to measure sound levels accurately even in the presence of high background noise.
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Page 3: Front Panel Description
FRONT PANEL DESCRIPTION MICROPHONE LCD DISPLAY - Power button ON/OFF - Records sound level readings - Freezes the maximum MAXHLD sound level digital reading - A/C frequency weighting selector - Background noise BA MODE absorber - Fast/Slow response selector - Adjusts the DOWN measurement range - Adjusts the... -
Page 4: Front Panel Diagram
FRONT PANEL DIAGRAM... -
Page 5: Measuring Sound Levels
MEASURING SOUND LEVELS Sound levels are displayed both digitally and in a bar graph. The digital display is updated every 160ms, while the bar graph is updated every 40ms. Press the ON/OFF key to turn the meter on. The unit will first display the full screen and then count down to zero.(See Fig. - Page 6 SELECTING A AND C WEIGHTING When you turn the meter on, it will be in A weighting mode. A weighting enables the meter to respond in the same manner as the human ear, which increases and decreases amplitude over the frequency spectrum.
- Page 7 SELECTING THE RESPONSE TIME You can select fast or slow response time to suit different applications and standards. For example, most OSHA-related testing is done using slow response time and A weighting. When you turn the meter on, it will be in FAST response mode. Press the F/S key to toggle between FAST and SLOW response.
- Page 8 FAST Fig.5 RECORDING THE MAXIMUM AND MINIMUM MEASUREMENTS 1 Press the ON/OFF key to turn the meter on. 2 Press the REC key. REC will be displayed on the bottom of the screen(See Fig.6) . The meter will begin tracking the maximum and minimum sound level measurements.
- Page 9 4 Press the REC key again. MAX will appear on the bottom of the screen and the maximum sound level measurement will be displayed. The unit is not recording at this time,but the bar graph will continue to show the current reading. Fig.8 5 Press the REC key again to resume recording and repeat the process.
- Page 10 3 Press the BA MODE key. F will be displayed to the left of the SPL (sound pressure level) icon. The digital display will show the background noise level.MAX HOLD will be disappeared now. (See Fig.9) UNDR FAST Fig.9 4 Press the MAXHLD key again and MAXHOLD will be displayed.
- Page 11 BACKLIT KEY (8922 only) Offer a light for approximate 5 seconds to make it easier to see the display in the dark. SELECTING AUTOMATIC AND MANUAL RANGING The meter features six measurement ranges in 10dB steps: 30~80dB, 40~90dB, 50~100dB, 60~110dB, 70~120dB, 80~130dB. When you turn the meter on, it will be in automatic range mode and a small AUTO will be displayed on the left side of the...
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Page 12: Automatic Shut-Off
TO ADJUST THE RANGE MANUALLY: 1 When measuring sound levels,press the DOWN and UPPER keys as needed to adjust the measurement range. MANU will appear on the display (See Fig.12) .Note that the two digit number to the left of the bar graph will change to reflect the low of the newly selected range. - Page 13 To override the Auto Shut Off feature: 1 Make sure the unit is turned off. 2 Press the ON/OFF and MAXHLD buttons simultaneously. 3 When the full display appears, release the MAXHLD button first. "n" will appear on the screen in one second (See Fig.15) , then enter the power on mode ;...
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Page 14: Specifications
SPECIFICATIONS IEC 651 Type 2, ANSI Applicable S1.4 Type 2 Standards Measurement 31.5Hz~8KHz Frequency Range 1.5dB(Under reference Accuracy conditions) Measurement Level A 30dB~130dB Weighting Measurement Level C 35dB~130dB Weighting 6 ranges in 10dB steps: Measurement 30~80dB, 40~90dB, 50~100dB, 60~110dB, Level Range 70~120dB, 80~130dB Automatic Range 30~130dB... - Page 15 RS232 OUTPUT: The meter can link with personal computer to capture on-line datas , display presure records with real-time output, you can retrieve file, save the datas for operating data analysis, records statistic, multi-files display in the screen,..versatile functions for your choice.
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Page 16: Material Supplied
MATERIAL SUPPLIED This standard package contains: 1. The meter x 1 2. Battery x 1 (9.0 volt) 3. Operation manual x 1 4. Buffer x 1 5. Hard Carrying case x 1 Optional accessory: a) RS232 software CD-R. b) D-sub connector. CE CERTIFICATION The meter conforms to the following standards:... -
Page 17: Warranty
WARRANTY The meter is warranted to be free from defects in material and workmanship for a period of one year from the date of purchase. This warranty covers normal operation and does not cover battery , misuse , abuse , alteration , tampering , neglect , improper maintenance , or damage resulting from leaking batteries . - Page 18 Accuracy, the Zenith of Measuring / Testing Instruments ! Hygrometer Thermometer Anemometer Sound Level Meter Air Flow meter Infrared Thermometer K type Thermometer K.J.T. type Thermometer K.J.T.R.S.E. type Thermometer pH Meter Conductivity Meter T.D.S. Meter D.O. Meter Saccharimeter Manometer Tacho Meter Lux / Light Meter Moisture Meter Data logger...
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