Rion NA-42 User manual

3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan
http://www.rion.co.jp/english/
INSTRUCTION MANUAL
Sound Level Measuring Amplier
NA-42

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Organization of this manual
This manual describes the features and operation of the Sound Level Measuring
Amplier NA-42.
The manual contains the following sections.
Outline
Gives basic information on the conguration and features of the unit, and
contains a block diagram.
Controls and Features
Briey identies and explains all parts of the unit.
Preparations
Describes installation, connections, inserting batteries, pre-use checks and
other steps.
Measurement
Describes the steps for measurement.
Comparator
Describes how to use the comparator function.
Serial Interface
Describes how to use the serial interface for connection to a computer.
Technical Reference
Provides additional information that is helpful for using the unit.
Specications
Lists the technical specications of the unit.
* Company names and product names mentioned in this manual are usu-
ally trademarks or registered trademarks of their respective owners.

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FOR SAFETY
In this manual, important safety instructions are specially marked as shown
below. To prevent the risk of death or injury to persons and severe damage
to the unit or peripheral equipment, make sure that all instructions are fully
understood and observed.
Caution
Important
Disregarding instructions
printed here incurs the risk of
injury to persons and/or dam-
age to peripheral equipment.
Disregarding instructions
printed here incurs the risk of
damage to the product.
Mentioned about the tips to
use this unit properly.
(This messages do not have to
do with safety.)
Note

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Precautions
Operate the unit only as described in this manual.
Protect the unit from shocks and vibration. Be especially careful not to
touch the microphone membrane to avoid damage. The membrane is an
extremely thin metal lm which can be damaged easily.
Ambient conditions for operation of the unit are as follows: temperature
range -10°C to +50°C, relative humidity 10% to 90%.
Protect the unit from water, dust, extreme temperatures, humidity, and
direct sunlight during storage and use. Also keep the unit away from air
with high salt or sulphur content, gases, and stored chemicals.
Always turn the unit off after use. Remove the batteries from the unit if
it is not to be used for a long time. When disconnecting cables, always
grasp the plug and do not pull the cable.
Before using the microphone and before putting it away, always check that
the microphone grid has not become loose. If this has happened, refasten
the microphone grid rmly and then use or store the microphone.
Clean the unit only by wiping it with a soft, dry cloth or, when neces-
sary, with a cloth lightly moistened with water. Do not use any solvents,
cleaning alcohol or cleaning agents.
Do not try to disassemble the unit or attempt internal alterations.
In case of an apparent malfunction, do not attempt any repairs. Note the
condition of the unit clearly and contact the supplier.
To ensure continued precision, have the unit checked and serviced at
regular intervals.
Dispose of batteries in accordance with national or local laws and regula-
tions.
Do not tap the LCD panel for example with your nger or a pen, to prevent
possible malfunction or damage.

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Caution
Some pins of the INPUT connector carry a
high voltage. To prevent the risk of electric
shock, never insert a metal clip or any other
pointed object into the input connector.

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Contents
Organization of this manual............................................................ i
FOR SAFETY............................................................................... iii
Precautions.....................................................................................iv
Outline ............................................................................................1
Controls and Features......................................................................4
Front Panel ................................................................................4
Rear Panel ................................................................................8
Display ...................................................................................10
Preparations ..................................................................................13
Power Supply ..........................................................................13
Inserting Batteries ..................................................................13
AC Adapter ............................................................................. 14
Microphone and Preamplier Connection................................15
Calibration...............................................................................20
1) Electrical calibration ......................................................20
2) Calibration with pistonphone NC-72A
or sound calibrator NC-74 ............24
3) Insert CAL calibration ...................................................29
Using a Tripod .........................................................................33
Using a Windscreen.................................................................34
Using the Prop-up Feet ...........................................................35
Measurement ................................................................................36
Power-On.................................................................................36
Level Range Setting.................................................................38
Frequency Weighting Setting...................................................39
Time Weighting Setting ...........................................................40
Lp/ Lmax / Lpeak Setting............................................................41
Low-Pass Filter Setting............................................................44
High-Pass Filter Setting...........................................................45

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Bar Graph Display Range (20 dB/50 dB) Setting.....................46
Menu Settings..........................................................................47
External Filter Setting .............................................................52
Backlight On/Off.....................................................................53
Comparator ...................................................................................54
Serial Interface..............................................................................58
Transfer Protocol ....................................................................58
Local Mode/Remote Mode .....................................................59
Transfer Sequence ................................................................... 61
Error Processing .....................................................................63
Control Operation in Remote Mode ........................................63
Command Format ...................................................................64
Commands ..............................................................................67
Technical Reference ......................................................................81
Microphone and Preamplier Selection ...................................81
Microphone .............................................................................85
Preamplier .............................................................................88
Insert CAL...............................................................................89
Extension Cable .......................................................................90
Windscreen..............................................................................92
Inuence of Background Noise................................................94
Frequency Weighting ...............................................................95
INPUT Connector....................................................................96
RMS Detection Circuit and Time Weightings..........................97
Factory Default Settings ........................................................100
Displaying the Software Version............................................ 101
Rack Mounting ...................................................................... 101
NA-42PB1 ............................................................................. 102
Specications ..............................................................................104

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