montena technology sa
Route de Montena 89
1728 Rossens
Switzerland
Tel. +41 26 411 84 84
Fax +41 26 411 17 79

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NEMP Simulators
MIL-STD-461 RS105

The MIL-STD-461, respectively IEC 61000-4-25 and AECTP 500, is applicable to equipment or subsystems located outside a shielded facility. The RS105 test method describes a transient electromagnetic pulse of up to 50 kV/m, double exponential wave with a rise time in the nanosecond range, that is applied to the equipment under test (EUT) at least 5 times. The EUT should not exhibit any signs of performance degradation.

Montena designs and manufactures bounded wave NEMP (Nuclear Electromagnetic Pulse) / HEMP (high altitude NEMP) simulators for radiated susceptibility tests. Mobile systems for indoor use and fixed simulators for outdoor installations have been developed and marketed since 1998.

The simulator setup mainly consists of a high voltage pulse generator connected to a transmission line ended with distributed resistors. A voltage monitor and various field sensors are used to measure the generator output and the electric and magnetic field strengths. The resulting signals are transmitted via fibre optics or coaxial cables to the oscilloscope.

Advantages

  • Proven performance with many systems installed worldwide
  • Triangular transmission line design with distributed load resistors for bounded wave propagation with minimal reflection
  • Indoor transportable small test systems; outdoor permanent large test installations
  • Automated management and test report generation for simple measurement
  • Low risk of operator's handling mistakes
  • Other pulse shapes according to other standards such as IEC or national standards on request
  • Expertise in the refurbishment of existing old test installations.

Specifications

  EQUIPMENT REFERENCE SPECIFICATIONS
Movable simulators for small devices Generator EMP25K Generator with 25 kV erected voltage
Transmission line RL50 Compact radiating lines to place on a table. Height of 0.5 m
Movable indoor simulators Generator + control unit EMP80K, EMP170K, EMP280K, EMP360K or EMP520K Generators with 80 kV, 170 kV, 280 kV, 360 kV or 520 kV erected voltage
Transmission line RL180, RL270, RL360, RL540 or RL720 Movable radiating lines. Heights of 1.8 m, 2.7 m, 3.6 m, 5.4 m or 7.2 m
Fixed outdoor simulators Generator + control unit EMP360K to 2000K Generators from 360 kV up to 2 MV erected voltage
Transmission line RL540 to RL2500 Fixed radiating line. Heights from 5.4 m to 25 m
Pulse monitoring Voltage monitor SV1G Monitoring of the generator output pulse
Free field sensor SFE3-5G Free space field sensors up to 3.5 GHz
Ground field sensor SGE3-5G Ground plane field sensor up to 3.5 GHz
Passive integrator ITR1-2U Passive integrator for ground plane field sensor and voltage monitor
Balun BL3-5G Balun for free space field sensor
Measurement equipment Data transmission MOL3000 & FCLB50 Analog optical link with 50 m single mode fibre
Shielded box SB3G Enclosure to protect the oscilloscope from the EM pulse
Oscilloscope OD4C600M 600 MHz bandwidth, 10 Gs/s, 4 channels
Software   Computer control of the simulator and electromagnetic field measurement

The following table gives some examples of simulators compliant with the 50 kV/m electric field required in MIL-STD-461 RS105.

GENERATOR
REFERENCE
RADIATING LINE
REFERENCE
EUT dimension in meterSYSTEM OVERALL DIMENSIONS in meter
WIDTHLENGTHHEIGHTWIDTHLENGTHHEIGHT
EMP25K-2-23RL50-500.650.40.170.82.00.5
EMP80K-2-23RL180-501.01.30.52.56.61.8
EMP170K-2-23RL270-501.61.90.83.7510.92.7
EMP280K-2-23RL360-502.152.51.15.014.33.6
EMP360K-2-23RL540-503.33.81.67.521.05.4
EMP520K-2-23RL720-504.05.52.110.028.07.2
EMP1000K-2-23RL1080-50Dimensions available on request
EMP1000K-2-23RL1290-50
EMP1400K-2-23RL1800-50
EMP2000K-2-23RL2500-50
RS105 simulators using GTEM and coaxial generators are available on request