Atek QUEST TECHNOLOGIES M-7B Quick Start Manual
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Atek QUEST TECHNOLOGIES M-7B Quick Start Manual

Noise dosimeter
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Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)

TABLE OF CONTENTS

MODEL M-7B NOISE DOSIMETER ...................................................
General Description ....................................................................
Specifications ............................................................................
................................................................
PRINCIPLES OF OPERATION .........................................................
General ....................................................................................
Weighting Characteristics ............................................................. 6
Microphone Characteristics .........................................................
Internal Electrical Noise ...............................................................
115 dB (A) Indicator ....................................................................
Memory ....................................................................................
OPERATING PROCEDURE ............................................................
Battery Test ..............................................................................
Battery Replacement ..................................................................
Taking a Measurement ...............................................................
Noise Exposure Conversion Chart .................................................
Effects of Operator's Presence ...................................................... 10
Considerations of Measurement and Accuracy ................................. 12
................................................................ 13
............................................... 16
........................................................................... 16
SERVICE POLICY ......................................................................... 17
Service Policy ........................................................................... 17
NOTE
Your new M-7B Dosimeter fully meets the require-
ments of the OSHA Hearing Conservation Amend-
ment and has the following capabilities:
1. 80-140dBA dynamic range.
2. 30dB crest factor for impulsive noise
measurements.
3. User-selectable threshold of 80 or 90dB
with jumper (located under the battery
compartment on the circuit board.)
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Summary of Contents for Atek QUEST TECHNOLOGIES M-7B

  • Page 1: Table Of Contents

    ® Advanced Test Equipment Rentals TABLE OF CONTENTS www.atecorp.com 800-404-ATEC (2832) MODEL M-7B NOISE DOSIMETER …………………………………………… General Description ………………………………………………………….. Specifications …………………………………………………………………. Controls and Display ………………………………………………………. PRINCIPLES OF OPERATION ………………………………………………… General ………………………………………………………………………… Weighting Characteristics ……………………………………………………. 6 Microphone Characteristics ………………………………………………… Internal Electrical Noise ……………………………………………………… 115 dB (A) Indicator …………………………………………………………..

  • Page 2: Model M-7B Noise Dosimeter

    MODEL M-7B NOISE DOSIMETER In industrial environments where noise levels vary continually, manual computation of noise dose involves tedious day-long measurement with a sound level meter and stop watch in order to determine the noise exposure as GENERAL DESCRIPTION computed by the formula: The Quest Model M-7B Noise Dosimeter is a lightweight, pocket-sized self- contained instrument that measures cumulative exposure to noise.

  • Page 3: Specifications

    The M-7B on delivery, is always calibrated to the requirements of the Calibration: External calibration adjustment available. May use Model CA-32 prevailing OSHA law unless otherwise indicated by the user. The unit can, Timed Sound Calibrator, Model CA-12B Sound Calibrator, Model CA-15B however, be set to other range and threshold levels, and can also be converted Calibrator, or other calibrators that will adapt to the 8 mm microphone.

  • Page 4: Controls And Display

    PRINCIPLES OF OPERATION Conversion Capability: Should there ever be a requirement or OSHA law change, the M-7B can be converted from 5 dB to a 3 dB or 4 dB exchange General ratio. The M-7B Noise Dosimeter uses a small omnidirectional ceramic CONTROLS AND DISPLAY microphone buffered by a high impedance FET input stage.

  • Page 5: Microphone Characteristics

    Internal Electrical Noise The internal electrical noise of the M-7B is equivalent to an acoustic level of approximately 40 dB. With the dosimeter lower threshold set at 80 dB(A) or higher, internal electrical noise thus has no effect on the reading. 115 dB(A) Indicator When using the M-7B, if the microphone is exposed to more than 115 dB(A) for a minimum of one second, the indicator circuitry will latch on, and the...

  • Page 6: Taking A Measurement

    Take care to observe polarity of battery and connector. Be sure a good exposure), it would mean that the wearer had received twice the maximum electrical connection has been made. Then replace the battery and the cover. dosage for the day. If the measurement is taken for 4 hours of an 8 hour work NOTE day, the counter should read less than 050.00 (50% of the allowable exposure) When battery is connected, the counter memory can...

  • Page 7: Considerations Of Measurement And Accuracy

    If the dosimeter is mounted on a tripod and used as an area monitor, the microphone should be suspended away from the tripod and M-7B chassis (see Figure 7). It is recommended that a thin rod be used to hold the microphone with the cable extended the full 30 inches.

  • Page 8: Use With Windscreen

    CALIBRATION AND MAINTENANCE would accumulate a sound while the second would not. This same problem occurs with a sound level meter where the operator must make a judgment The M-7B should maintain its accurate calibration for many months of use. whether the noise is just above or below the threshold.

  • Page 9: Accessories

    Using the Quest CA-12B single-level, single frequency calibrator To check the M-7B turn it on, wait at least 10 seconds, depress the READ (Optional): button, and reset the counter to zero. Turn the CA-15B Calibrator on to desired frequency with the 8 mm adapter in the calibrator cavity. Place the M-7B Place the 8 mm adapter into the CA-12B.

  • Page 10: Service Policy

    Service Policy The Quest product you have purchased is one of the finest acoustic instru- ments available. It is backed by our full one year warranty which seeks com- plete customer satisfaction. This is your assurance that you can expect prompt courteous service for your equipment from the entire Quest service organiza- tion.

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