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KS C 9835 EMC Radio Frequency Testing of Multimedia Equipment

KS C 9835 test, previously known as KN 35, applies to Multimedia Equipment (MME) that has rated AC or DC supply voltage. As a leader in electromagnetic compatibility, EMC, regulatory compliance testing, Keystone Compliance assists electronic equipment manufacturers with electromagnetic compatibility, EMC, testing. Meeting the 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 is in constant communication throughout the entire test process. Our proven process helps avoid product launch delays. Our expert test engineers work with clients to quickly develop appropriate and concise test plans. Additionally, Keystone Compliance’s accurate test reports are delivered quickly using our “four-eyes” approach. Meaning that multiple engineers and technicians review each report, ensuring that all the information required is present. 

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Summary of KS C 9835 Unintentional Radiator Device Testing

The KS C 9835 international lab testing standard applies to Multimedia Equipment (MME) that has rated AC or DC supply voltage not exceeding 600 V. MME intended primarily for professional use is incorporated into this standard. Equipment pertaining to immunity requirements in the frequency range covered in this document formulated in other CISPR reports are excluded from this document.

Multimedia equipment can be defined as equipment that is information technology equipment, audio, video, broadcast receiver, entertaining lighting control equipment, or a combination of these.

Two main objectives in this KS C 9835 compliance test are acknowledged.

  • This electromagnetic compatibility document establishes radio frequency energy requirements which will provide a suitable level of intrinsic immunity so that the MME will operate as intended. The intended environment can range from 0 kHz to 400 GHz.
  • The KS C 9835 EMC document also specifies procedures to ensure the reproducibility of tests and the repeatability of results.

Scope of KS C 9835 Electromagnetic Compatibility EMC Compliance Testing

This RF device test requires immunity testing procedures including but not limited to:

  • Selection of applicable tests
  • Disturbance levels to be applied during testing
  • Configuration
  • Performance criteria 

All aspects of the equipment are defined and documented by the manufacturer prior to the start of the KS C 9835 EMC testing procedures. These requirements include but are not limited to, selection of the primary function(s), specific performance criteria, and modes of operation to be used.

During the KS C testing of ports, the primary functions are monitored and assessed. These are monitored against the relevant performance criteria given by the manufacturer. However, signal processing and data storage functions are assessed in accordance with the criteria mentioned in KS C 9835.

A port is described as a physical interface through which electromagnetic energy enters or leaves the equipment under testing. Types of ports include antenna ports, broadcast receiver tuner ports, and optical fiber ports.

Immunity tests required in this standard are performed individually, in any sequence. The same sample is used for all tests relating to a particular EM phenomenon. However, other samples of the EUT may be used to test against different EM phenomena.

There are two types of functions mentioned within this test program:

          Direct functions: These include functions that can be observed or monitored. An example is the measurement of demodulated tone within a telephone handset.

          Indirect functions: Indirect functions can only be observed by monitoring direct functions. Examples of indirect functions include the ability of a DVD recorder to store video which may be assessed for accuracy using the playback function at the completion of the test.

When direct and indirect functions operate this way, and the two functions have different performance criteria, the least stringent of these criteria is applied.

KS C 9835 Electromagnetic Compatibility Testing Conditions

Particular requirements within CISPR 35 must be considered prior to testing. Some of these requirements include, but are not limited to:

  • Electrostatic Discharge: ESD is applied to points and surfaces of the EUT which are expected to be touched during normal operation.
  • Continuous RF Disturbances: Swept frequency tests, spot frequency tests, and additional spot frequency tests are applied.
  • Power Frequency Magnetic Field: This protocol is in accordance with IEC 61000-4-8.
  • Electrical Fast Transients/Bursts: This procedure is in accordance with IEC 61000-4-4. Multi-conductor cables are tested as single cables. Cables are not split or divided into groups.
  • Voltage Dips and Interruptions: This test procedure is in accordance with IEC 61000-4-11.
  • Broadband Impulse Conducted Disturbances: Repetitive noise impulses and isolated noise impulses are applied to xDSL ports of the EUT.

Expert KS C 9835 EMC Regulatory Compliance RF Testing Lab

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 KS C 9835 RF compliance testing, Keystone has a full scope of expertise including environmental and package testing such as vibration, immersion, and cold chain.

Complete our request a quote form to get a jump start on the conversation. Have a question about unintentional radiators or our EMC/EMI device testing lab? Contact us or call (724) 657-9940 and we will determine the best course of action.