ELPM
AS

Page 1 of 3
Certificate No. SC200000E

CALIBRATION CERTIFICATE

Customer name

: RION SERVICE CENTER CO., LTD.

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

Product: SOUND CALIBRATOR

Type: NC-74

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.

ELP
M
AS

Page 2 of 3
Certificate No. SC200000E

CALIBRATION RESULT

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

Expandedvalue

uncertainty*1

94.25 dB

0.09 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*2)
For calibration, the referred measured value (Sound pressure level(with reference load volume)) should be used. ( See“INSTRUCTION MANUAL”
of NC-74 )Measured

Expandedvalue

uncertainty*1

94.00 dB

0.10 dB

Reference load volume*2：1025mm3
Reference Sound pressure：2×10-5 Pa*1 Defines an interval estimated to have a level of confidence of approximately 95%
Coverage factor k=2*2 Effective load volume of microphone at reference condition of NC-74(Equivalent to the effective load volume of the types of UC-27 and UC-53A (using with1/2-inch adapter NC-74-002))
Calibration result is the calibration value in ambient conditions during calibration.
Important：
The sound pressure level of the sound generated by NC-74 depends on the effective
load volume of the microphone. ( See“INSTRUCTION MANUAL”of NC-74 )

ELP
M
AS

Page 3 of 3
Certificate No. SC200000E

BE OUT OF JCSS CALIBRATION

1. Frequency

Measuredvalue
1000.0 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
0.5 %Working measurement standard distortion meter：
Type： AD725D
Serial number ： 0000000000（A2LA Calibration Certificate No.000-00000）
End of certificateELPM
ASNOTESFor different types of the microphones, actual sound pressure levelof the NC-74 sound La (dB) shall be calculated as the following equation.

La  Lrlv  C
WhereLrlv ： Sound pressure level with reference load volume indicated in clause 2 (dB)
C ： Compensation value for microphone type indicated in Table 1 (dB)

Table 1Compensation value of sound pressure level for different typesof microphone (typical value)Type

Compensation value (dB)1-inch microphones

RION

B&K
TOKYO RIKO

UC-11

（with protective grid）

0.00

UC-27

（with protective grid）

0.00

UC-25

（with protective grid）

-0.09

UC-34

（with protective grid）

-0.13

4160

（without protective grid）+0.25

MR-103 （without protective grid）+0.26

1/2-inch microphones using with 1/2-inch adapter NC-74-002

RION

B&K

UC-26

（with protective grid）-0.09

UC-30（with protective grid）

-0.02

UC-31

（with protective grid）+0.04

UC-33P （with protective grid）

+0.03

UC-52

（with protective grid）+0.10

UC-53A （with protective grid）

0.00

UC-57

（with protective grid）

+0.05

UC-59

（with protective grid）+0.02

MS-10 （with protective grid）

-0.01

4180

+0.16

（without protective grid）

201409