EMI/EMC Testing

EMI/EMC testing can reliably predict product performance in any electromagnetic environment. Testing can also determine the possibility of interference with other equipment, possibly degrading performance. Testing may be required in order to comply with regulations or for informational and product improvement purposes.

Electromagnetic interference (EMI) testing ensures that your product will perform properly when subject to the electromagnetic environment in which it is expected to operate. Electromagnetic compatibility (EMC) testing requires appropriate electrical and structural design, equipment installation, wiring installation, and equipment qualification to meet its intended environment.

Dayton T. Brown, Inc.’s experienced staff of electrical engineers and technicians can help bring your project to completion in a timely, low-cost manner.


img-description img-description EMI Testing for the

EMI Testing for the Military/Aerospace

DTB performs testing to all revision levels of MIL-STD-461. We can perform emissions and susceptibility testing up to 40 GHz and generate radiated susceptibility fields of 200 V/m in the frequency range of 10 kHz-40 GHz. We can also generate peak radiated susceptibility fields well in excess of 2,000 V/m in various frequencies within the range of 10 kHz-40 GHz in support of HIRF testing, MIL-STD-464, ADS-37A-PRF, RTCA/DO-160, and UK DEF Standards.

DTB is A2LA (Cert. No. 0767.02) and NVLAP (Lab Code 200422-0) accredited for MIL-STD-461 testing. We have large semi-anechoic test chambers with high current DC and AC power sources available.

img-description img-description RTCA/DO-160


DTB can test to all of the latest RTCA/DO-160 criteria. RTCA/DO-160 testing covers the standard procedures and environmental test criteria for testing airborne electronic equipment (avionics) for the entire spectrum of aircraft – from light, general aviation aircraft and helicopters, to business jet and VIP aircraft, through regional and commercial aircraft.

We can perform emissions and susceptibility testing up to 40 GHz. Our equipment can also generate radiated susceptibility fields in excess of 200 V/m in the frequency range of 10 kHz-40 GHz.

DTB is A2LA (Cert. No. 0767.02) and NVLAP (Lab Code 200422-0) accredited for MIL-STD-461 testing. We have large semi-anechoic test chambers with high current DC and AC power sources available.

img-description img-description TEMPEST


TEMPEST is a National Security Agency (NSA) specification and NATO certification that refers to monitoring information systems through leaking emanations, including unintentional radio or electrical signals, sounds, and vibrations.

DTB is certified under the NSA TEMPEST Test Services Program to provide TEMPEST testing and engineering support services. All of the work is performed by our in-house Certified TEMPEST Professionals (CTPs).

DTB’s test capabilities are in accordance with the NSTISSAM TEMPEST/1-92 and CNSSAM TEMPEST 01-02 specifications. We have performed over 100 TEMPEST programs on equipment that includes computers, peripherals, and other IT equipment; as well as DoD communication systems that include encrypted radios, key loaders, and secure communication components. Our experience extends to platform level support for aircraft, surface ships, and ground vehicles.

Furthermore, we have a standalone TEMPEST test facility, which is separate from our main test lab, to offer our customers and their programs the additional privacy that this type of testing can necessitate.

With over 30 years of TEMPEST experience, we can provide a full range of support, including proposals, control and test plans, laboratory and/or field testing, failure analysis and corrective action, and installation guidance.

img-description img-description Positive Train Control (PTC)

Positive Train Control (PTC)

Railroad systems across the country are required to comply with the Rail Safety Improvement Act of 2008 and the Federal Railroad Administration’s PTC regulations. These requirements include the delivery of a PTC Implementation Plan, a PTC Development Plan, and a PTC Safety Plan. The PTC system must be designed to prevent train-to-train collisions, over-speed derailments, incursion into established work zone limits, as well as the movement of a train through a switch in the wrong position.

DTB’s team of subject matter experts and technicians offers exceptional assistance in meeting these requirements and deadlines. We can help throughout the implementation process – from the development of the test plan, all the way through testing. We provide both the equipment and the personnel to operate and verify the performance of the PTC communication systems.

Test Plan Generation and Development:

  • Test procedures
  • Test plans
  • Engineering documentation

RF Performance Testing:

  • Fading
  • Carrier-to-Interference (C/I)
  • Intermodulation rejection
  • RF performance with ancillary filters and amplifiers

Communication Systems Bench Testing:

  • Traffic loading and density
  • Latency and throughput
  • Peak loading
  • Mobile – base selection and handoff
  • TDMA functionality and performance
  • Operational scenarios in support of ACSES
img-description img-description Electromagnetic Pulse (EMP)

Electromagnetic Pulse (EMP)

An electromagnetic pulse (EMP) is defined as a high amplitude, short duration, and broadband pulse of electromagnetic energy. EMP is the electromagnetic effect resulting from the detonation of a nuclear device at high altitudes (also known as HEMP, HAEMP, and HNEMP). EMP is a serious matter because it can have devastating effects on unprotected electronic equipment.

MIL-STD-461 includes radiated (RS105) and conducted (CS116) test methods and test levels for determining a device’s immunity to EMP. The coupling modes into the equipment enclosure and its interconnecting cabling can be complex and are, therefore, evaluated separately.

The RS105 test method addresses the risk of radiated exposure to an EMP event. Testing is generally applicable to equipment installed in exposed and partially exposed environments on aircraft, surface ships, submarines, and ground vehicles.

The CS116 test method addresses the effects of EMP coupling onto interconnecting wiring harnesses. The goal of this test is to ensure the equipment’s immunity to damped sinusoidal transients induced on the equipment’s cables. Testing is generally applicable to all applications with limited applicability to submarine equipment.

img-description img-description Shielding Effectiveness

Shielding Effectiveness

DTB has over 50 years of shielding effectiveness experience from the 1960s-era aircraft harnesses through the latest in Ethernet CAT-7 cables and composite materials.

There are dozens of shielding effectiveness specifications for military and commercial markets, which are designed to provide a tool for quality control for specific materials. We have specialized in adapting these specifications to develop tests to evaluate shielding effectiveness in real-world conditions.

In conjunction with the US Navy, DTB has constructed one of the first large stirred mode chambers to test the shielding effectiveness of large armament systems.

Many of our customized test approaches have been incorporated into product development specifications or test specifications. We can test in accordance with IEEE 299, MIL-DTL-83528C, IEC 61726, ANSI/SCTE 48-1, and MIL-STD-285 and have performed shielding effectiveness testing on hundreds of items, including the following:

  • Rooms – shielded, unshielded
  • Cabinets – system racks, equipment enclosures
  • Panels – metal, composites, laminates, glass, fabric
  • Cables – power, RF, communications, Ethernet, etc.
  • Connectors
  • Gaskets
  • Special/Unique – aircraft fuselage, torpedo hull, aircraft engine cowling

New products or applications also undergo environmental and vibration evaluations in our lab. We have performed specialized tests, such as combined temperature/vibration tests to assess pin chatter in connectors, cold temperature bend radius for cables, or long-term corrosion tests on composite panels.

img-description img-description Test Facilities

Test Facilities

DTB offers some of the most unique test facilities in the world. Our EMI/EMC test facilities have been designed to handle a wide variety of EMI/EMC testing.

We feature six semi-anechoic chambers of various sizes, including our large, climate-controlled Three-Meter chamber, which can accommodate large test items and is used to perform testing activities in support of the FCC Declaration of Conformity and Certification for the specifications listed on our A2LA Scope of Accreditation (Cert. No. 0767.02). In addition to those facilities, we have a GTEM chamber, a reverberation chamber, and a shielded screen chamber that can be configured for different power or frequency ranges.

We also have a standalone TEMPEST test facility, which is separate from our main test lab, to offer our customers and their programs the additional privacy that this type of testing can necessitate.

img-description img-description Test Equipment

Test Equipment

DTB’s test equipment provides the right environment in which to conduct your test program in an efficient manner – all under one roof. Our equipment includes multiple receivers and signal sources, transient test systems and generators, power amplifiers, antennas, probes, and line impedance stabilization networks (LISNs).

img-description img-description Site Surveys

Site Surveys

DTB has the personnel, portable equipment, and power sources necessary to perform on-site testing in most locations for the following:

  • Conducted ambient, DC-1 GHz
  • Magnetic field, DC-30 MHz
  • Electric field, 30 Hz-40 GHz
  • Vibration and noise

DTB will come to you! We have been performing on-site services for many years, which are often necessary when the test item is unable to be moved. We have performed testing on railway sites and on naval vessels – bringing our expertise out of the lab and into the field.

img-description img-description Lightning


We can test your electrical systems or their component parts for damage tolerance from the transients created when struck by lightning.

Our lightning simulation test system from HV Technologies is capable of generating a wide range of single-stroke, multi-stroke (MS), and multi-burst (MB) waveforms, as required by the latest national and international aviation test standards.

DTB’s indirect lightning strike testing capabilities include:

  • Testing in compliance with RTCA/DO-160, Section 22
  • Testing in compliance with MIL-STD-461G, CS117
  • MS, MB, and pin injection lightning, per SAE ARP5412
  • Testing for specific Airbus and Boeing requirements

DTB also provides single-stroke and MS, MB, and pin injection testing, as well as cable injection testing services on equipment with complex digital circuitry. Whether the damaging effects of lightning are a routine, occasional, or an infrequent risk, we can minimize the effects on your systems – giving your products the lightning protection required for dependable performance.

img-description img-description Shipboard Power
& Magnetic Field

Shipboard Power & Magnetic Field

DTB is capable of meeting the requirements of DC magnetic field environments, typically applicable to shipboard testing. In addition, we can perform all of the testing and measurements specified in MIL-STD-1399 and DoD-STD-1399. DTB can also provide ungrounded user equipment input power in accordance with MIL-STD-1399, Section 300A.

Our testing facilities house a complete spectrum of variable voltage and variable frequency testing power capabilities, including 440 VAC, line-to-line, 3-phase, up to 60 kVA; 115 VAC, line-to-line, 3-phase, up to 50 kVA; and 115 VAC, line-to-line, 2-wire, up to 20 kVA.

1,000 V and 2,500 V Voltage Spike Tests:

  • 3-phase or 2-wire configured test items using an isolated power source, as required by the specification, in accordance with Appendix A of MIL-STD-1399, Section 300A

DC Magnetic Field Susceptibility Testing:

  • Specified in MIL-STD-1399, Section 070, and performed by DTB’s engineers and technicians; our largest test coil has internal dimensions of 17 ft. by 10 ft.

    MIL-STD-461D, E, and F Testing:

    • Up to 200 Amp/phase of 440 VAC, 3-phase, 60 Hz ungrounded filtered power; and 115 VAC, line-to-line, 3-phase, 60 Hz ungrounded filtered power, in accordance with MIL-STD-1399, Section 300A
  • img-description img-description Other Electrical Tests

    Other Electrical Tests

    In addition to our other EMI/EMC tests, we also perform other electrical tests, such as high power, power quality, electrostatic discharge (ESD), and more. DTB’s team of experts can conduct numerous types of electrical measurements, as well as design and calibrate measurement setups, to get you the information that you need in order to verify your device’s performance.

    Don’t see your requirement on the list? Just ask us!

    High Power:

    • AC, 480 V, 3-phase, 600 Amp
    • DC, 300 V, 150 Amp

    Power Quality:

    • MIL-STD-704, per MIL-HDBK-704, including 270 VDC capability
    • MIL-STD-1399, Section 300
    • MIL-STD-1275
    • UK DEF STAN 61-5 (Part 6)
    • RTCA/DO-160, Section 16
    • Commercial aviation specifications
    • Airbus specifications
    • Boeing specifications

    Electrostatic Discharge (ESD):

    • RTCA/DO-160, Section 25
    • MIL-STD-461G, CS118
    • EN 61000-4-2
    • ISO 10605
    • UK DEF STAN 59-41 (Part 3), Supp. R DCS10
    • UK DEF STAN 59-411 (Part 3)
    • IEC 801-2
    • SAE J1113-13
    • Boeing specifications

    Electrical Fast Transient:

    • EN 61000-4-4
    • IEC 61000-4-4

    Surge Immunity:

    • ANSI C62.41
    • EN 61000-4-5
    • IEC 61000-4-5

    Voltage Dips, Interruptions, Variations, and Transients:

    • EN 61000-4-11
    • IEC 61000-4-11
    • MIL-STD-704
    • MIL-STD-1399
    • MIL-STD-1275

    Magnetic Effect:

    • RTCA/DO-160, Section 15

    Other Electrical Tests:

    • Voltage spike
    • Resistance
    • Capacitance
    • Inductance
    • Frequency
    • Voltage
    • Current
    • Leakage current
    • Dielectric breakdown
    • Power
    • Power factor
    • Impedance
    • Contact resistance
    • Contact bounce
    • Gain
    • Insulation loss
    • Insertion loss
    • Return loss
    • Cross talk
    • Frequency response