What Is CS114?
CS114 is an immunity test under MIL-STD-461 in which RF current is injected into the equipment's cable bundle via a current probe to evaluate continuity of function.
Purpose of CS114
The purpose is to verify that RF interference coupled onto the platform's cable bundles does not disrupt equipment function.
Which Products Is CS114 Applied To?
- Military electronic units
- communication equipment
- Sensor and actuator systems
In Which Sectors Is CS114 Used?
Standards Related to CS114
- MIL-STD-461 CS114
CS114 Conditions
- Frequency range
- Defined in the standard; typically 10 kHz – 200 MHz
- injection current
- Defined current level (dBµA) according to platform type
- Modulation
- Defined in the standard; usually pulse or CW
- Kablo demetleri
- All wiring harnesses are tested individually
Equipment for CS114
- RF signal generator and power amplifier
- Injection and monitoring current probes
- Screened room and reference plane
- Function-monitoring system
Sample Requirements for CS114
- Cable bundles must be identified and numbered
- The function-monitoring method must be defined
- Cable lengths must comply with the standard
- Function must be checked before the test
Duration of CS114
Depends on the number of cable bundles; typically one working day.
CS114 Procedure
- 1The injection probe is calibrated.
- 2The probe is placed on the cable bundle.
- 3The frequency band is swept and the defined current level is applied.
- 4Repeated for each cable bundle.
- 5Function is monitored continuously.
CS114 Acceptance Criteria
The acceptance criterion is that no functional degradation occurs; details are defined in the platform specification.
Evaluation of Results
The bundle and frequency at which degradation occurs are recorded, providing input for shielding and filtering design.
CS114 Report
- Applied standard and test code
- Frequency range and current level
- Cable bundles tested
- Functional observations
Accreditation
EUROLAB holds internationally recognised accreditation obtained from accreditation bodies party to the IAF and ILAC multilateral recognition arrangements, under ISO/IEC 17025 for laboratory testing, ISO/IEC 17020 for inspection and surveillance, and ISO/IEC 17021-1 and ISO/IEC 17065 for system and product certification. This chain ensures the reports and certificates issued are accepted worldwide.
Whether this test can be offered within accredited scope depends on your product and the standard applied; since accreditation is method-based, the scope is confirmed in writing at the quotation stage.
Scope and authorisationsRelated Regulations
- Defence procurement specifications
EMC / EMI Testleri — What Does This Testing Field Cover?
The section below describes the field that the CS114 test belongs to; the conditions and acceptance criteria of this particular test are given in the sections above. The scope specific to your product is confirmed in writing at the quotation stage.
EMC testing answers a question with two sides: does the device emit an unacceptable level of electromagnetic interference into its surroundings (emission), and does it withstand the interference coming from them (immunity)? The two sides are measured with separate tests and separate set-ups, and both are required.
The field exists because of a simple physical fact: every conductor carrying current behaves like an antenna. A switched-mode power supply, a motor drive or the clock signal of a microcontroller radiates radio frequency energy even though it was never designed to. The same conductor also works in reverse: an external field induces a voltage across it. In an environment crowded with devices, this mutual effect means devices disturbing one another.
On the emission side, conducted and radiated emission are measured separately. Conducted emission is the interference the device imposes on its mains and communication cables and dominates at lower frequencies. Radiated emission is the field the device releases into the air and comes to the fore at higher frequencies. The two are measured in different set-ups, and the limits vary by product group.
On the immunity side, real-world sources of interference are simulated: electrostatic discharge (human touch), radiated radio frequency fields (a nearby transmitter), electrical fast transients (switching), surges (lightning and mains events), conducted radio frequency, power-frequency magnetic fields, voltage dips and short interruptions.
The standard to be applied depends on WHERE the product is used, and that choice determines the entire outcome. Residential and industrial environments carry different sets of limits; in vehicles the UNECE R10 regime applies rather than CE; for medical devices IEC 60601-1-2 brings additional requirements; and for products containing a radio, radio legislation comes into play and harmonised ETSI standards are used.
In immunity testing the acceptance criterion is a PERFORMANCE CRITERION class, not a binary pass/fail. A device continuing to function without interruption during the test, being temporarily affected and recovering by itself, or recovering only through user intervention are different classes. Which class is acceptable is defined in the product standard; the tolerance for a device carrying a safety function differs from that of a consumer device.
The most common shortcoming of an EMC file is that it covers only one side. A file carrying an emission report alone is not complete in terms of the EMC directive. The second common gap is a test set-up that does not represent actual use: if the device is measured on a bare bench with cables different from its real ones, the result does not carry over to the field.
Method groups in this field
Conducted emission
Interference imposed on the cable through mains and communication ports, measured via an artificial mains network (LISN).
Radiated emission
The field released into the air by the device, measured at a defined distance in an anechoic or semi-anechoic chamber.
Harmonics and flicker
The harmonic content of the current drawn from the mains and voltage fluctuation; the side that affects mains quality.
Electrostatic discharge
Contact and air discharge together with indirect discharge; the most frequently applied immunity test.
Radiated and conducted RF immunity
The device is exposed to a defined field strength and to an RF signal injected into the cable.
Mains-borne events
Electrical fast transients, surges, voltage dips and short interruptions.
Commonly confused in this field
- An emission report alone does not complete an EMC file; immunity must be demonstrated as well.
- An FCC report is not accepted in a CE file; the limits, measurement distances and set-ups are different.
- The EMC Directive does not apply to vehicles; the UNECE R10 regime does. Specifications requiring both together should be reviewed.
- The warning that a Class A device may cause interference in a residential environment is mandatory in the manual; market surveillance checks that this warning is present.
- The test set-up is part of the report. If cable type, length or routing changes, the result changes; measurement must be made in the series-production configuration.
- CISPR 22 and CISPR 13 have been withdrawn; their current counterparts are CISPR 32 and CISPR 35.
Which decisions these results support
- CE declaration under the EMC Directive
- The EMC part of radio equipment conformity
- A UNECE R10 file for a vehicle component
- Resolving field interference complaints and correcting the design
- Assessing the EMC impact of a board or wiring-harness change
Related Tests
Frequently Asked Questions About CS114
According to which standard is CS114 made?
CS114 is executed in scope MIL-STD-461 CS114. The limit values and acceptance criteria to be applied are defined in the product standard; The version valid for your product is confirmed in writing at the offer stage.
Which products does CS114 apply to?
Mainly applied to Military electronic units, communication equipment and Sensor and actuator systems. Whether your product is included in the scope is determined by examining its technical specifications and intended use.
Under what conditions is CS114 done?
The determining parameters are: Frequency range — Defined in the standard; typically 10 kHz – 200 MHz, injection current — Defined current level (dBµA) according to platform type and Modulation — Defined in the standard; usually pulse or CW. The full terms are in the "Test Conditions" section on the page and vary depending on the product standard.
What kind of sample is needed for CS114?
Cable bundles must be identified and numbered, The function-monitoring method must be defined and Cable lengths must comply with the standard. The number of samples is determined according to the product standard and the scope to be reported.
How long does CS114 take?
Depends on the number of cable bundles; typically one working day. This duration belongs to the experiment itself; sample preparation, queuing and reporting are also evaluated. A realistic schedule for your product is given in the offer.
What is the CS114 result called "appropriate"?
The acceptance criterion is that no functional degradation occurs; details are defined in the platform specification.