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NZS CISPR 22 EMC Radio Disturbance Testing of Information Technology Equipment

The CISPR 22 standard establishes consistent requirements for the radio disturbance level of equipment contained from 9 kHz to 400 GHz. As a leader in electromagnetic compatibility, EMC, regulatory compliance testing, Keystone Compliance assists electronic equipment manufacturers with EMC testing. Meeting the New Zealand, IEC, EN, and other EMC testing requirements can be challenging. Not only do we understand the challenges, but we help guide companies through the process.

Keystone takes pride in tailoring each test plan to individual customer needs minimizing unnecessary costs and over-testing. Our proven process helps avoid product launch delays. Additionally, we have a reputation for helping customers achieve their EMC product certifications. From concept through compliance, Keystone meets all of our customers’ needs under one roof. 

Request a quote to receive expert EMC testing services tailored to your specific needs. Ready to get started? We are. Contact us to see why so many companies work with us to achieve their RF and CISPR 22 testing needs.

Summary of NZS CISPR Radio Disturbance EMC Characteristics

As mentioned above, the scope of CISPR 22 compliance testing ranges from 9 kHz to 400 GHz. However, limits are only in restricted frequency bands. This is considered sufficient to reach adequate emission levels to protect radio broadcast and telecommunication services.

Procedures are given for the measurement of the levels of spurious signals. These can be generated by the ITE and limits are specified for the frequencies mentioned above for both class A and Class B equipment.

The RF EMC regulatory compliance test may also describe methods of measurement and assist to standardize operating conditions and interpretation of results.

Scope of NZS EMC CISPR 22 RF Compliance Testing

Information Technology Equipment (ITE) is categorized into two different electromagnetic compatibility classifications.


Class B of information technology equipment is a category of devices that fill the need of Class B ITE disturbance limits. It is primarily used for domestic environments. This may include but is not limited to:

  • Equipment with no fixed place of use. For example, portable equipment powered by built-in batteries.
  • Telecommunication terminal equipment powered by a telecommunication network.
  • Personal computers and auxiliary connected equipment.


This is a category of all other ITE which satisfies the class A ITE limits. However, it must not include Class B limits. This equipment is not recommended to be restricted in its sale. In domestic environments, this device may cause radio interference. In which case, the user may be required to take adequate precautions.

NZS CISPR Unintentional Radiator Device Testing Conditions

The equipment under test is configured, installed, arranged, and operated per the manufacturer’s typical operating instructions.

Where there are multiple of the same interface ports, additional interconnecting cables/loads/devices are added to the EUT. This may depend upon the preliminary test results. The number of additional wires of the same type is limited to the condition where the addition of another cable does not seriously affect the emission level. For example, it varies less than 2dB, provided that the EUT remains compliant.

General New Zealand EMC conditions may permit disturbances from the Equipment Under Test (EUT) to be acclaimed from ambient noise. The suitability of the site can be found by measuring the ambient noise levels with the EUT inoperative. Ensuring that the noise level is at least 6 dB below specified limits.

If shielded or special cables are used, manual advising is needed.

A system that consists of several separate units is configured to form a minimum representative configuration. The number and mix of units included must usually be representative of that used in a typical installation.

Examples of a minimum representative include:

For personal computer or personal computer peripherals, the minimum configuration consists of:

  • Personal computer
  • Keyboard
  • Visual display unit
  • External peripheral for every two different types of available I/O protocols
  • If the EUT has a dedicated port for a special purpose

Point of sale terminal, the minimum system consists of:

  • Active processor
  • Keyboards
  • Cash drawer
  • Display units
  • Typical peripheral
  • Handheld device

One module of each type must be operative in each information technology equipment ITE evaluated in equipment under testing. For a system EUT, one of each type of ITE in the possible system configuration is included.

Keystone Compliance Provides Expert CISPR 22 Radio Disturbance Device Testing

Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. Our team strives to give our customers more time and energy on product development instead of testing. In addition to electromagnetic compatibility CISPR 22 testing, Keystone has a full scope of expertise including environmental and package testing such as ingress protection, temperature, and cold chain

Request a quote to find out for yourself about the Keystone difference. Have a question about CISPR 22 RF device testing? Contact us or call (724) 657-9940 and we will determine the best course of action.