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Organization of the NL-21/NL-31 Documentation
The documentation for the Sound Level Meter NL-21/NL-31 consists of three
separate manuals.
z Instruction Manual (this document)
Describes operating procedures for the Sound Level Meter NL-21/ NL-31,
connection and use of peripheral equipment such as a level recorder and printer,
and use of the memory card.
z Serial Interface Manual
Describes how to use the serial interface built into the Sound Level Meter
NL-21/NL-31. The manual covers the communication protocol, use of
control commands for the sound level meter, format of data output by the
sound level meter, and other topics.
z Technical Notes
This document provides in-depth information about the circuit
configuration and performance of the sound level meter, microphone
construction and characteristics, influence of extension cables and
windscreen on the measurement, and other topics.
* Company names and product names mentioned in this manual are usually
trademarks or registered trademarks of their respective owners.
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