MIL-STD-461G RE101: Radiated Emissions, Magnetic Field
MIL-STD-461G RE101 is applicable from 30 Hz to 100 kHz for radiated emissions from equipment and subsystem enclosures, including electrical cable interfaces. The requirement does not apply to radiation from antennas. For Navy aircraft, this requirement is applicable only for aircraft with ASW equipment which operates between 30 Hz and 10 kHz such as Acoustic (Sonobuoy) Receivers or Magnetic Anomaly Detectors (MAD).
MIL-STD-461G RE101 is used to verify that the magnetic field emissions from the EUT and its associated electrical interfaces do not exceed specified requirements.
Test Equipment
The test equipment shall be as follows:
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: DC resistance between 5 and 10 ohms
(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
Procedures
The test procedures shall be as follows:
a. Turn on the measurement equipment and allow sufficient time for stabilization.
b. Measurement system integrity check.
(1) Apply a calibrated signal level, which is at least 6 dB below the limit (limit minus the loop sensor correction factor), at a frequency of 50 kHz. Tune the measurement receiver to a center frequency of 50 kHz. Record the measured level.
(2) Verify that the measurement receiver indicates a level within ±3 dB of the injected signal level.
(3) If readings are obtained which deviate by more than ±3 dB, locate the source of the error and correct the deficiency prior to proceeding with the testing.
(4) Using an ohmmeter, verify that the resistance of the loop sensor winding is between 5 and 10 ohms.
c. EUT testing.
(1) Turn on the EUT and allow
