ELPM
AS

Page 1 of 3
Certificate No. SC20000AE

CALIBRATION CERTIFICATE

Customer name

: RION SERVICE CENTER CO., LTD.

Customer address: 2-22-2, Hyoe, Hachioji, Tokyo 192-0918, JAPAN

Product: SOUND CALIBRATOR（Pistonphone）

Type: NC-72A

Serial number: 00000000

Manufacturer: RION CO., LTD.

Calibration quantities : Sound pressure level (with reference standard microphone)Sound pressure level (with reference load volume)
Calibration method: Measured by specified secondary standard microphone
according to JCSS calibration procedure
specified by RION SERVICE CENTER.

Ambient conditions: Temperature 23.0 ℃, Humidity 50 %R.H.,
Static pressure 101.33 kPa

Calibration date

: **/**/**** (DD/MM/YYYY)

Calibration location: 2-22-2, Hyoe, Hachioji, Tokyo 192-0918, JAPANCalibration Room

We hereby certify that the results of this calibration were as follows.
Issue date : **/**/**** (DD/MM/YYYY)〇〇〇〇〇 〇〇〇〇〇 Head of Office
Quality Control Office
Engineering Business Unit
RION SERVICE CENTER CO., LTD.
2-22-2, Hyoe, Hachioji, Tokyo 192-0918, JAPANThis certificate is based on article 144 of the Measurement Law and indicates the result of calibration in accordancewith measurement standards traceable to Primary Measurement Standards (National Standards) which realizes thephysical units of measurement according to the International System of Units (SI).
The accreditation symbol is attestation of which the result of calibration is traceable to Primary Measurement
Standards (National Standards).
The certificate shall not be reproduced except in full, without the written approval of the issuing laboratory.
The calibration laboratory who issued this calibration certificate conforms to ISO/IEC 17025:2017.
This calibration certificate was issued by the calibration laboratory accredited by IAJapan who is a signatory to the
Mutual Recognition Arrangement (MRA) of International Laboratory Accreditation Cooperation (ILAC) and Asia
Pacific Accreditation Cooperation (APAC). This (These) calibration result(s) may be accepted internationally through
ILAC/APAC MRA.

ELPM
ASPage 2 of 3
Certificate No. SC20000AE

CALIBRATION RESULT

1. Sound pressure level (with reference standard microphone)
Measured

Expandedvalue*1

uncertainty*2

114.23 dB

0.08 dB

Specified secondary standard microphone：
Type：BK4160
Serial number：0000000
Reference Sound pressure：2×10-5 Pa

2. Sound pressure level (with reference load volume*3)
For calibration, the referred measured value (Sound pressure level(with reference load volume)) should be used. ( See“INSTRUCTION MANUAL”of NC-72,NC-72A )Measured

Expandedvalue*1

uncertainty*2

114.11 dB

0.09 dB

Reference load volume*3 ： 960mm3
Reference Sound pressure：2×10-5 Pa*1 Converted value at reference static pressure 101.325kPa*2 Defines an interval estimated to have a level of confidence of approximately 95%
Coverage factor k=2*3 Effective load volume of microphone at reference condition of NC-72,NC-72A
Calibration result is the calibration value in ambient conditions ( except staticpressure ) during calibration.
Important：
The sound pressure level of the sound generated by NC-72,NC-72A depends on theeffective load volume of the microphone and static pressure at the time of use．
（ See“INSTRUCTION MANUAL”of NC-72,NC-72A ）

ELPM
AS

Page 3 of 3
Certificate No. SC20000AEBE OUT OF JCSS CALIBRATION

1. Frequency

Measuredvalue
250.0 Hz

Measurement
uncertainty(k=2)
5×10-7 Hz

Working measurement standard universal counter：
Type： 53132A
Serial number ： 0000000000（A2LA Calibration Certificate No.000-00000）
2. Total distortion
Measuredvalue
2.0 %Working measurement standard distortion meter：
Type： AD725D
Serial number ： 0000000000（A2LA Calibration Certificate No.000-00000）
End of certificate

EL
PM
ASNOTESFor different types of the microphones, actual sound pressure levelof the NC-72,NC-72A sound La (dB) shall be calculated as the following equation.

La  Lrlv  C  20  log 10PaP0WhereLrlv ： Sound pressure level with reference load volume indicated in clause 2 (dB)
C ： Compensation value for microphone type indicated in Table 1 (dB)
Pa ： Static pressure at the time of use
P0 ： Reference static pressure 101.325kPa (reference conditions)

Table 1Compensation value of sound pressure level for different typesof microphone (typical value)
TypeCompensation value (dB)1-inch microphones
RION
B&K
TOKYO RIKO

UC-27

（with protective grid）

-0.03

UC-25

（with protective grid）

-0.08

UC-34

（with protective grid）-0.104160（without protective grid）+0.12

MR-103 （with protective grid）+0.24

MR-103 （without protective grid）+0.12

1/2-inch microphones using with 1/2-inch adapter NC-72-S16

RION

B&K

UC-26

（with protective grid）

-0.13

UC-28

（with protective grid）

-0.09

UC-30

（with protective grid）

-0.09

UC-31

（with protective grid）-0.06

UC-33P （with protective grid）

-0.07

UC-52

（with protective grid）-0.03

UC-53A （with protective grid）

-0.09

UC-57

（with protective grid）

-0.06

UC-59

（with protective grid）-0.07

MS-10 （with protective grid）

-0.09

4180

0.00

（without protective grid）

1/4-inch microphones using with 1/4-inch adapter NC-72-S06
RION

UC-29

（with protective grid）+0.01

201409