EMC noise measurement and diagnosis

Asama Test Laboratory

Equipped with a large 10-meter radio wave anechoic chamber and a large shield room. Our experienced technical staff will provide measurement, diagnosis, countermeasures and advice. (Location: Saku City, Nagano Prefecture) Technical cooperation: Soshin Electric Co.

  • It can also be used for large equipment. (Turntable 3m in diameter / Load capacity 3t / Power capacity 75kVA)
  • Measurement of communication devices is also possible. (The opposing unit can be installed in a shielded room due to the pit structure.)
  • We offer the best countermeasures and advice based on our rich experience, track record and in cooperation with the EMC engineering department.
Interior view of the anechoic chamber

Interior view of the anechoic chamber


EMC measurements of large, high-power equipment and transmission and communication equipment

  • VLAC (VLAC-038)
  • TUV Rheinland

VCCI (No. A-0189)

Overview of the Asama Test Laboratory Radio Wave Anechoic Chamber and Shield Room
1. Outline of measurement equipment
Radio wave anechoic chamber Shield Room
Effective room dimensions(Depth x Width x Height) 17m×11m×7.5m 7.0m×7.0×2.8m
Effective door dimensions(Width x Height) 1.9m×2.5m 2.3m×2.5m
Load capacity 3t 3t
Turntable Diameter 3m
Other equipment Air and cooling water can be supplied
2.Measurement equipment specifications
Measurement frequency range, etc. Radio wave anechoic chamber Shield room
Electromagnetic emission disturbance 9kHz to 40GHz
Noise terminal disturbance voltage 9kHz to 30MHz 9kHz to 30MHz
Harmonic current disturbance 50Hz~2kHz
Shielding Characteristics 100dB at10kHz to 10GHz 100dB at10kHz to 10GHz
Other Site attenuation
Within ±4dB of theoretical value
Magnetic Shield
attenuates external magnetic field to 1/30
Power supply equipment Radio wave anechoic chamber Shield Room
Single-phase ~277V 50/60Hz 75kVA(90A) ~280V 50/60Hz 20kVA(100A)
Three-phase ~240V 50/60Hz 75kVA(180A)
~480V 50/60Hz 75kVA (90A)
~280V 50/60Hz 24kVA(80A)
~500V 50/60Hz 24kVA(40A)
Direct current DC 0 to 60V/0 to 200A
3.Measurement details●EMI measurement for industrial equipment, information processing equipment, and home appliances
Examination subjects Radio wave anechoic chamber Shield room Applicable standards
Power terminal disturbance voltage CISPR,EN,VCCI,FCC
Radiated electric field strength ×
Noise disturbance power CISPR 14,EN55014
Harmonic current disturbance × IEC/EN 61000-3-2
Voltage fluctuation (flicker) disturbance (rated at 16 A or less) × IEC/EN 61000-3-3
●Immunity testing of industrial equipment and information processing equipment
Examination subjects Radio wave anechoic chamber Shield room Applicable standards
Electrostatic discharge immunity IEC/EN61000-4-2
Radiated Electromagnetic Field Immunity × IEC/EN61000-4-3
Electrical First Transient
/Burst Immunity
Surge Immunity IEC/EN61000-4-5
Conducted disturbance immunity IEC/EN61000-4-6
Power Frequency Magnetic Field Immunity IEC/EN61000-4-8
Voltage drop, momentary interruption, variation test IEC/EN61000-4-11
Conducted common mode from 0Hz-150kHz Disturbance Immunity IEC/EN61000-4-16
Top view of Asama Test Laboratory
Top view of Asama Test Laboratory Asama Test Lab Appearance

Asama Test Lab Appearance

On-site testing

We can visit anywhere in Japan
For large equipment that cannot be brought to the Asama Test Site, EMC testing is conducted at the customer’s site. The best solution is provided by pre-testing, and speedy response is possible by visiting customers from four locations (Saku City, Nagano Prefecture, Osaka and Nagoya).
Technical cooperation: Soshin Electric Co.
Mobile diagnostic vehicle

Mobile diagnostic vehicle

Measurement scenery

Measurement scenery

CE marking
Overview of Onsite Testing
  • For large equipment and fixed facilities that cannot be brought to the test site, we will visit your factory or designated location to conduct EMC measurement.
  • We can obtain a certificate in cooperation with a notified body. (Please consult with us separately.)
  • We provide various noise countermeasures and advice at the pre-test stage, and support up to standard compliance.
  • On-site testing (measurement and countermeasures) other than CE marking certification testing is also available.
  • Characteristic tests in shield room (electric and magnetic fields, magnetic field measurement)
  • Investigation and countermeasures for noise disturbance caused by inverters, servo-mounted equipment, etc.
Target property

Large machine tools, semiconductor manufacturing equipment, injection molding machines, industrial robots, etc.

CE marking and on-site testing test items
Classification Test item Applicable standard Test specification
Emission Power terminal disturbance voltage CISPR11/EN5011 Frequency : (9kHz) 150k to 30MHz, LISN300A
Radiated electric field strength CISPR11/EN5011 Frequency : (9kHz) 30MHz to 6GHz
Immunity Electrostatic discharge immunity EN61000-4-2 Contact discharge 4kV (8kV MAX)
Air discharge 8kV (15kV MAX)
Radiated Electromagnetic Field Immunity EN61000-4-2 Alternative testing with transceivers and cell phones
Electrical First Transient
/burst immunity
EN61000-4-4 2kV, 4kV (4.4kV MAX)
Surge Immunity EN61000-4-5 L to G: 4kV
L to L: 2kV
Conducted disturbance immunity EN61000-4-6 150 kHz to 1000 MHz 10 V
(150kVHz to 230MHz 30V MAX)
  • The power terminal disturbance voltage test is performed by bringing an isolation transformer (max. 60kVA) to the power supply side, so there is no need to worry about breaker tripping.
  • Measurements up to 300A can be made accurately with LISN (pseudo power supply network).
  • We can also comply with the Machinery Directive and Low Voltage Directive through our affiliated certification organizations and consultants.