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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 (-0dB, +6dB), double exponential waveform with a rise time in the nanosecond range, that is applied to the 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. Transportable systems for indoor/outdoor 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 in the test area. The resulting signals are transmitted via fibre optic links 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/outdoor transportable solutions; outdoor permanent large test installations
• Automated management and test report generation for simple measurement
• Other pulse shapes according to standards such as IEC or national standards on request
• Expertise in the refurbishment of old test installations.

	EQUIPMENT	REFERENCE	SPECIFICATIONS
Desktop simulator for small EUT	Generator	EMP25K	Generator with 25 kV erected voltage
	Transmission line	RL50	Compact radiating line to place on a table. Height of 0.5 m
Movable indoor/outdoor simulators	Generator	EMP80K, EMP240K, EMP320K or EMP480K	Generators with 80 kV, 240 kV, 320 kV or 480 kV charging voltage
	Transmission line	RL140, RL360, RL500 or RL730	Transportable systems. Heights of 1.4 m, 3.6 m, 5.0 m or 7.3 m
Fixed outdoor simulators	Generator	EMP320K to 2000K	Generators from 320 kV up to 2 MV charging voltage
	Transmission line	RL500 to RL2500	Fixed radiating lines. Heights from 5.0 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	ITR1U2-A	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 80 Hz - 3.5 GHz, with 50 m single mode fibre
	Shielded box	SB3G	Enclosure to protect the oscilloscope from the EM pulse
	Oscilloscope	OD4C1G	1 GHz bandwidth, 10 GSa/s, 4 channels
	Software		Computer control of the simulator and automated pulse measurement

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

GENERATOR REF.	RADIATING LINE REF.	TEST VOLUME in meter			SYSTEM OVERALL DIMENSIONS in meter
		WIDTH	LENGTH	HEIGHT	WIDTH	LENGTH	HEIGHT
EMP25K-2-23	RL50-50	0.35	0.57	0.17	0.8	2.0	0.5
EMP80K-2-23	RL140-50	1.0	1.5	0.45	2.1	6.0	1.4
EMP240K-2-23	RL360-50	2.3	3.8	1.1	4.8	16.4	3.6
EMP360K-2-23	RL500-50	3.4	5.8	1.7	6.8	18.4	5.0
EMP480K-2-23	RL730-50	4.8	8.4	2.4	9.7	25.6	7.3
EMP800K-2-23	RL1080-50	Dimensions available on request
EMP1000K-2-23	RL1290-50
EMP1400K-2-23	RL1800-50
EMP2000K-2-23	RL2500-50
RS105 simulators using GTEM and coaxial generators are available on request