Pre-compliance filter testing and analysis in-house at MPE

Pre-compliance filter testing and analysis in-house at MPE

A typical configuration often tested – an MPE EMC filter
with shielded cables in close proximity to each other,
shown here in the power compartment of a defence
aerospace application. Mechanically, pre-compliance
testing work can also highlight the very tight space
constraints that may apply to housing a filter product.

MPE provides a sophisticated pre-compliance EMC testing
service, which can be either on-site or in-house in MPE’s dualchamber
screened room to suit customers’ needs where practical.
Typical scenarios for applying this capability include military
vehicles, test chambers, data centres, radar and communications
facilities and control rooms.
Before major compliance costs are incurred, the diagnostic, precompliance
EMC test service defines the most cost-effective
choice of EMI suppression to meet stringent EMC standards such
as DEF-STAN 59-411 Land Class A or Class B and MIL-STD 461.
As a longstanding supplier to the UK MOD, NATO and defence
forces around the world, MPE holds all relevant defence and
international standards approvals and has the experience,
expertise and products to protect all types of military equipment
and systems from EMI and EMP hazards.
Military specifications for mission-critical applications in defence
and aerospace are more stringent and require greater dynamic
range and different measurement bandwidths than less exacting
commercial standards.
The company’s pre-compliance evaluation service includes
baseline noise measurements, comparison to specifications, and
identification of local areas and causes of non-compliance. Precompliance
testing allows changes to be made during the design
phase based upon real-world test results.
The earlier that product deficiencies are identified during the
development process, the easier, less expensive and less timeconsuming
it is to rectify problems. Rework or even redesign at
the point of production usually comes at a high cost.
Sources of radiated or conducted noise can be located, and
individual pieces of equipment can be tackled, even down to
bench level, to defi ne the most appropriate screening or filtration
solution.
For example, all types of military vehicle ultimately need to be
tested for such emissions, and particular emphasis is placed on
emissions in the HF, VHF and UHF frequency bands where many
military radios operate. This electrical noise can be caused by
sparking from motor or generator brushes, microprocessors and
SMPS circuitry, or it can be produced by secondary radiation
from cables and harnesses carrying noisy signals down cables
connected to these devices.
Based on this pre-compliance testing, MPE’s Engineering
Department can then develop and supply full prototype filter units
for final approval work.
To find out more, you are invited to download a brochure on
MPE’s pre-compliance EMC testing capability from here.