Rion NC-72A User manual
3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan
http://www.rion.co.jp/english/
INSTRUCTION MANUAL
Pistonphone
NC-72A
i
Organization of this manual
This manual describes the features and operation of the Pistonphone NC-72A.
The manual contains the following sections.
Outline
Gives basic information on the unit.
NC-72A Main Unit External View
Contains drawings that show the pistonphone from all sides.
Accessories External View
Contains drawings that show the supplied accessories.
Names of Parts and Functions
Identies and explains all parts of the unit.
Operation
Explains how to insert batteries, how to use the supplied adapters, and how to calibrate
a sound pressure measurement system (sound level meter).
ii
* All company names and product names mentioned in this manual are usually
trademarks or registered trademarks of their respective owners.
Reference
Explains output level differences and compensation according to atmospheric pressure
and microphone combinations, and explains the inuence of radio frequency elds.
Specications
Lists the technical specications of the unit.
To conform to the EU requirement of the Directive on Waste Electrical
and Electronic Equipment, the symbol mark on the right is shown on
the instrument.
The product described in this manual is in conformity with the following
European standards;
EN60942:2003 EN61326-1:2013
This product can be used in any areas including residential areas.
iii
FOR SAFETY
In this manual, important instructions are specially marked as shown below. To prevent the risk of
damage to the unit or peripheral equipment, make sure that all instructions are fully understood
and observed.
Important These instructions are vital to prevent
the possibility of damage to the prod-
uct or of performance degradation.
Information printed here is not di-
rectly related to safety, but will assist
in correctly using the system.
Note
iv
Precautions
•Read the documentation carefully, and operate the unit only as described in this
manual.
•Do not use or store the unit in locations which may be
- subject to splashes of water
- subject to high levels of dust
- subject to direct sunlight
- subject to vibrations or shock
- subject to air with high salt or sulphur content, to gases, or are in the vicinity of
any substances that may adversely affect the unit
- outside of the specied temperature and humidity range
- subject to drastic temperature changes and to condensation
•To prevent the risk of battery uid leakage, remove the batteries from the unit when
not using it.
•This product does not require lubrication. Do not apply oil or similar to any part of the
unit.
v
•Do not try to disassemble or modify the unit.
•In case of malfunction, contact the supplier.
•During operation, sound other than the 250 Hz tone may be heard, but this does not
affect the performance of the unit.
•The NC-72A is a precision product. Always handle it carefully and do not subject it to
shocks.
•In order to maintain continued preciseness, have the unit checked and serviced once
per year. Contact the supplier for the check.
•When mounting and dismounting the microphone of the sound pressure measurement
system (sound level meter), do not rotate the microphone or pistonphone. Otherwise
the protective grid of the microphone may become loose or detached, causing damage
to the microphone diaphragm.
vi
Contents
Outline......................................................................................................... 1
NC-72A Main Unit External View ............................................................... 2
Accessories External View........................................................................... 3
Names of Parts and Functions...................................................................... 5
Coupler ................................................................................................... 5
Power supply section............................................................................... 6
Side view and top view ........................................................................... 7
Operation ..................................................................................................... 8
Inserting the batteries ............................................................................. 8
Checking the battery voltage ................................................................ 10
Sound pressure measurement system (sound level meter) calibration .... 11
Using the microphone adapters ............................................................. 15
Reference ................................................................................................... 16
Output sound pressure level compensation............................................ 16
Electromagnetic Compatibility ............................................................. 26
Specications ............................................................................................. 29
1
Outline
The pistonphone NC-72A is a sound calibrator that conforms to IEC 60942:2003 (JIS C
1515:2004) class LS/C and class 1/C specications.
It uses a purely mechanical sound source with very low time-based variations which is
capable of producing a sound of constant pressure and frequency unaffected by envi-
ronmental changes (however, compensation of the output sound pressure level for static
[atmospheric] pressure changes is required). The NC-72A is suitable for use in research
institutions as calibration sound source for maintenance and management of acoustic
measurement systems.
2
NC-72A Main Unit External View
114dB
250Hz
PISTONPHONE NC-72A
### #
dB.
JIS C 1515:2004
IEC 60942:2003
SOUND CALIBRATOR
Class LS/C and Class 1/C
Sound Pressure Level
Frequency 250 Hz
Ser. No.
Table of contents
