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User's Guide
Noise Dosimeter with PC Interface
Model 407355
Introduction
Congratulations on your purchase of the Extech 407355 Personal Noise Dosimeter. The
407355 is designed to test noise exposure in accordance with OSHA, MSHA, DOD,
ACGIH, and ISO standards. Fast and easy on-site surveys help determine noise
reduction requirements. The meter can also be used in SLM (sound level meter) mode
where sound pressure levels are monitored from 70 to 140dB. The SLM (sound level
meter) mode has a datalogging feature that can record up to 8800 readings which can
be downloaded to a PC for analysis. Note: In DOSIMETER mode, the individual
measurements are NOT datalogged and cannot be recalled.
The built-in RS-232 PC interface offers the following capabilities:
In SOUND LEVEL METER (SLM) MODE: The meter can be connected to PC while
taking measurements so that readings can be stored in a file and readings can be
viewed in a variety of display configurations (graph, list, etc.).
In DOSIMETER mode: The meter can perform a noise survey after which the user
can transfer the survey data to a PC.
Careful use of this device will provide years of reliable service.
www.burntec.com
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Summary of Contents for Extech Instruments 407355
- Page 1 Introduction Congratulations on your purchase of the Extech 407355 Personal Noise Dosimeter. The 407355 is designed to test noise exposure in accordance with OSHA, MSHA, DOD, ACGIH, and ISO standards. Fast and easy on-site surveys help determine noise reduction requirements. The meter can also be used in SLM (sound level meter) mode where sound pressure levels are monitored from 70 to 140dB.
- Page 2 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext.
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Page 3: Specifications
Unit of measure for Noise Exposure test Battery Status Indicator Event memory banks (E1-E5) 115dB limit (headphone) indicator 10. Numerical display digits 11. Unit of measure for sound level readings 12. 140dB PEAK indicator 13. Elapsed time mode for noise exposure tests 407355 Version 2.4 9/07... - Page 4 E5). Also used as the Up Arrow in the Programming mode RS-232 PC Interface plug RS-232 PC Interface jack Calibration potentiometer Battery compartment screw 10. Belt clip / Battery compartment cover 11. Battery compartment 12. Microphone jack 13. Housing screws (service personnel only) 407355 Version 2.4 9/07...
- Page 5 Press the MODE button repeatedly until the unit of measure is dBA (A-weighted decibels). In SLM mode the meter operates as a Type 2 sound level meter. The 407355 measures and displays sound pressure levels from 70 to 140dB. Read the measured sound level on the LCD.
- Page 6 85 dB. Sound levels below this threshold would not be included in the dose calculation. See the Programming section to change the level. The Threshold Level can be set from 70 to 90dB in 1 dB steps. 407355 Version 2.4 9/07...
- Page 7 EXPOSURE STANDARD software window can be used to configure the meter with one click of the mouse. To Manually Program the meter, follow these steps: 1. To access the programming mode, start with the 407355 power off. 2. Press and hold the (RESET) button while turning the instrument on.
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Page 8: Calibration Procedure
2. Set the response time to SLOW (see the Programming section) 3. Insert the 407355 microphone into the microphone cavity of the calibrator. 4. Turn the calibrator ON and adjust the CAL screw on the 407355 so that the LCD display matches the calibrator output signal (94dB typically). - Page 9 PC Interface Operational Modes The PC Interface for the Model 407355 is used for both the Sound Level Meter (SLM) and the Noise Exposures Survey modes of meter operation: Sound Level Meter (SLM): There are 2 modes, Data Acquisition and Datalogging. In ‘Data Acquisition’...
- Page 10 Simply click on the meter’s push-buttons in the CONTROL PANEL window. The MAIN SOFTWARE window has numerous functions and displays as detailed below. CONTROL PANEL WINDOW 407355 Version 2.4 9/07...
- Page 11 This selection allows the user to view data in DATA ACQUISITION SLM MODE in LIST, GRAPH, ANALOG, or DIGITAL formats (see diagrams). The CONTROL PANEL can also be opened from this menu. Analog, Digital, Graph and List Display Modes 407355 Version 2.4 9/07...
- Page 12 8 hours, the projected sound level average will be 57.2 dB. PEAK FLAG TIME: Time of day when sound level reached 115dB PEAK DURATION: Interval of time that sound level was equal to or greater than 115dB 407355 Version 2.4 9/07...
- Page 13 TWA is the 8-hour projected average sound level in dB based on data collected from the start of the test up to the time the TWA is checked. See the information window below. TWA is automatically calculated in the EVENTS window, discussed previously. 407355 Version 2.4 9/07...
- Page 14 The Set Mode is used to change the noise survey parameters and the Time/Date (see diagram). Select the desired settings and press the OK button when finished. It may take several minutes for the operation to complete. 407355 Version 2.4 9/07...
- Page 15 The wiring diagrams and pin-outs for the supplied PC Interface cable is provided below: DIN to DB-9 Cable Battery Replacement and Status Display The 407355 is powered by four (4) ‘AAA’ 1.5V batteries and the LCD display employs a 5- segment battery status indicator. 5-segment battery LCD status indicator When the batteries are fully charged, all five segments of the indicator will be visible.
- Page 16 Conversion from Percent Noise Exposure or Dose to 8-Hour Time Weighted Average Sound Level(TWA) Dose or percent TWA (dBA) 85.0 85.7 86.3 86.9 87.4 87.9 88.4 88.8 89.2 89.6 90.0 90.4 90.7 91.1 91.3 91.6 Note: Assumes 5-dB exchange rate and 90-dBA Criterion 407355 Version 2.4 9/07...
- Page 17 For the latest version of this User’s Guide, Software updates, and other up-to-the-minute product information, visit our website: www.extech.com Copyright © 2004 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form.