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14. Maintenance
Care, Cleaning and Storage
The SL355 is a delicate precision instrument; when handling, storing, or cleaning the instrument,
please observe the following:
(a) Storing the Instrument
•
Keep the instrument in a dry place.
•
For long-term storage, remove the batteries.
•
Do not exceed the storage temperature limits: -10 to +60
º
C (-14 to +140
º
F )
(b) Cleaning the Instrument
If the instrument casing becomes soiled, wipe it with a cloth that is lightly dampened with
water. Do not use abrasive cleansers or solvents. Do not allow moisture to enter the
microphone, connectors, or casing.
(c) Handling the instrument
•
Do not attempt to remove the microphone grid; the microphone can become easily damaged
if it is opened.
•
Do not attempt to open the instrument; there are no user-serviceable parts inside. If the
instrument requires service, please contact the point of sale.
•
Do not allow the instrument to come in contact with moisture.
•
Never mix battery types.
•
Never mix charged and discharged batteries.
•
Do not allow fully discharged batteries to remain inside the instrument.
•
Protect the instrument from impact.
15. Software Installation and Operation
The supplied CD-ROM includes the SL355 Software program, driver, and the Software Help Guide.
Please refer to the Software Help Guide for detailed instructions on the use of the supplied software.
Visit the Extech web site (
www.extech.com
) to check the latest version of the software; download a
newer version if necessary.
16. Glossary of Terms
% DOSE
The unit of measure, % DOSE, is used to quantify noise exposure measured during a work shift.
100% dose is the maximum allowable noise exposure in accordance with OSHA, MSHA, DOD,
ACGIH, and ISO standards. Most standards specify Criterion Level, Exchange Rate, Response
Time, and Frequency weighting for the dosimeter.
CRITERION LEVEL
To take an on-site noise exposure survey in accordance with standards such as OSHA and
MSHA, the dosimeter’s Criterion Level must first be set. The 100% DOSE parameter discussed
above is determined by the following equation: 100% DOSE = Criterion Level for 8 hours. Each
country has a unique Criterion Level (most countries, including the U.S., use 90dB). The Criterion
level is selectable (80, 84, 85, or 90dB).
