REQUIREMENTS FOR THE CONTROL OF
ELECTROMAGNETIC INTERFERENCE
CHARACTERISTICS OF SUBSYSTEMS AND
EQUIPMENT

MIL-STD-461E

is approved for use by all United States Departments

and

Agencies of the Department of Defense

a. Measurement Receivers
b. Current probes
c. Signal Generator
d. Data recording device
e. Oscilloscope
f.  Resistor (R)
g. LISNs

a. Measurement Receiver
b. Attenuators, 50 ohm
c. Rejection Networks

d. Directional Couplers
e. Dummy Loads, 50 ohm
f.  Signal Generators. For amplifier testing, a signal generator is required to drive the
amplifier that provides the modulation used in the intended application and that has
spurious and harmonic outputs that are down at least 6 dB greater than the applicable
limit.
g. Data recording device

a. Signal Generator
b. Power Amplifier
c. Oscilloscope
d. Coupling Transformer
e. Capacitor, 10 µF
f.  Isolation Transformer
g. Resistor, 0.5 ohm
h. LISNs

a. Measurement Receiver

b. Signal Generators (up to 3 ea)

c. Three Port Network (up to 3 ea)

d. Attenuators

e. Filters

See Appendix 50.8

a. Measurement Receiver

b. Signal Generators (up to 2 ea)

c. Three Port Network (up to 2 ea)

d. Attenuators

e. Filters

See Appendix 50.9

a. Measurement Receiver

b. Signal Generators (up to 2 ea)

c. Three Port Network (up to 2 ea)

d. Attenuators

e. Filters

See Appendix 50.10

a. Signal Generator
b. Amplifier (if required)
c. Isolation Transformers
d. Current Probe
e. Measurement Receiver
f.  Resistor, 0.5 ohm
g. Coupling Transformer

a. Measurement Receivers
b. Current injection probes (maximum insertion loss shown in Figure CS114-2, minimum
insertion loss is recommended, not required)
c. Current Probes
d. Calibration fixture: coaxial transmission line with 50 ohm characteristic impedance,
coaxial connections on both ends, and space for an injection probe around the center
conductor.
e. Directional Couplers
f.  Signal Generator
g. Plotter
h. Attenuators, 50 ohm
i.  Coaxial loads, 50 ohm
j.  Power Amplifiers

a. Pulse Generator, 50 ohm, charged line (coaxial)
b. Current Injection Probe
c. Drive cable, 50 ohm, 2 meters, 0.5 dB or less insertion loss at 500 MHz
d. Current Probe
e. Calibration fixture: coaxial transmission line with 50 ohm characteristic impedance,
coaxial connections on both ends, and space for an injection probe around the center
conductor.
f.  Oscilloscope, 50 ohm input impedance
g. Attenuators, 50 ohm
h. Coaxial loads, 50 ohm
i.  LISNs

a. Damped sinusoid transient generator, 100 ohm output impedance
b. Current injection probe
c. Oscilloscope, 50 ohm input impedance
d. Calibration fixture: Coaxial transmission line with 50 ohm characteristic impedance,
coaxial connections on both ends, and space for an injection probe around the center
conductor
e. Current probes
f.  Waveform recording device
g. Attenuators, 50 ohm
h. Measurement Receivers
i.  Power Amplifiers
j.  Coaxial loads, 50 ohm
k. Signal Generators
l.  Directional couplers

m. LISNs

a. Measurement Receivers
b. Data recording device
c. Loop sensor having the following specifications:
(1) Diameter: 13.3 cm
(2) Number of turns: 36
(3) Wire: 7-41 Litz wire (7 strand, No. 41 AWG)
(4) Shielding: Electrostatic
(5) Correction factor: See manufacturer’s data for factors to convert measurement
receiver readings to decibels above one picotesla (dBpT).
d. LISNs
e. Ohmmeter
f.  Signal Generator

a. Measurement Receivers
b. Data recording device
c. Antennas
(1) 10 kHz to 30 MHz, 104 cm rod with impedance matching network
(a) When the impedance matching network includes a preamplifier (active rod),
observe the overload precautions in 4.3.7.3.
(b) Use a square counterpoise measuring at least 60 cm on a side.
(2) 30 MHz to 200 MHz, Biconical, 137 cm tip to tip
(3) 200 MHz to 1 GHz, Double ridge horn, 69.0 by 94.5 cm opening
(4) 1 GHz to 18 GHz, Double ridge horn, 24.2 by 13.6 cm opening
d. Signal Generator

e. Stub Radiator
f.  Capacitor, 10 pF
g. LISNs

a. Measurement Receiver
b. Attenuators, 50 ohm
c. Antennas
d. Rejection Networks
e. Signal Generators
f.  Power Monitor

a. Signal source
b. Radiating loop having the following specifications:
(1) Diameter: 12 cm
(2) Number of turns: 20
(3) Wire: No. 12 insulated copper
(4) Magnetic flux density: 9.5x107 pT/ampere of applied current at a distance of
5 cm from the plane of the loop.
c. Loop sensor having the following specifications:
(1) Diameter: 4 cm
(2) Number of turns: 51
(3) Wire: 7-41 Litz wire (7 Strand, No. 41 AWG)
(4) Shielding: Electrostatic
(5) Correction Factor: See manufacturer’s data for factors to convert measurement
receiver readings to decibels above one picotesla (dBpT).
d. Measurement Receiver or narrowband voltmeter
e. Current Probe
f.  LISNs

a. Signal Generators
b. RF Power Amplifiers Microwave Power Amplifiers
c. Receive Antennas
(1) 1 GHz to 10 GHz, double ridge horns
(2) 10 GHz to 40 GHz, other antennas as approved by the procuring activity
d. Transmit Antennas
e. Electric field sensors (physically small - electrically short)
f.  Measurement Receiver
g. Power Meter
h. Directional Coupler

i.  Attenuator
j.  Data recording device
k. LISNs

a. Transverse Electromagnetic (TEM) cell, parallel plate transmission line or equivalent
b. Transient pulse generator, mono-pulse output, plus and minus polarity
c. Storage oscilloscope, 500 MHz, single-shot bandwidth (minimum), variable sampling
rate up to 1gigasample per second (Gsa/s)
d. Terminal protection devices
e. High-voltage probe, 1 GHz bandwidth (minimum)
f.  B-dot sensor probe
g. D-dot sensor probe
h. LISNs
i.  Integrator, time constant ten times the overall pulse width