RadiMation Application Note 147

How to perform a MIL-STD RE101 Radiated Emission test

This application note explains how the MIL-STD RE101 Radiated Emission test can be performed with RadiMation^®.

The "RE101, radiated emissions, magnetic field" test is applicable to equipment, subsystem enclosures and all interconnecting cables and is used to verify that the magnetic field emissions from the EUT and cabling do not exceed the specified requirements.

The exact requirements and test methods for the RE101 are specified in the MIL-STD-461.

Necessary equipment

The following devices are necessary to execute this test:

• Receiver
• Loop sensor (Antenna)
• LISN
• Cable

Configuration of the testsites

The configuration of the equipment is a loop sensor antenna connected with a cable to a receiver.

The configuration of the testsite should thus contain the following devices:

Device name	Tab in testsite configuration window	note
Antenna	Devices 1	Loop sensor antenna for the required frequency range
Spectrum Analyser	Devices 2	The receiver used for the test
Cable preamp -> analyser	Cables	Cable with a correction file specified for the loss

Note the lisn is only used to decouple and it is not needed to specify and configure this in RadiMation^®

Configuration of the Loop sensor antenna

The loop antenna needs to have the correction data applied which is normally known by the manufacturer. The correction data is expressed in dBpT.

In RadiMation^® this can be configured by creating a correction file, which contains a 'Frequency' and a 'Correction' column. Then specify the frequencies and the correction values in the correction file. The correction values are expressed in dBpT/uV.

Once this correction is stored to disk, this correction file can be specified in the loop antenna driver configuration as 'Magnetic Field Factor':

Perform the test

To perform the actual RE101 test, start a Radiated Emission Multiband test:

    Tests

       Radiated Emission

          Multiband

The complete test from 30 Hz up to 150 kHz has different settings for different frequency bands. All these different bands can be configured. The test can be configured with 3 bands, each using their applicable frequency range, measure time and bandwidth.

Band	Frequency range	RBW	Step size	Measure time receiver	Measure time FFT receiver
Band 1	30 Hz - 1 kHz	10 Hz	5 Hz	0.15 s	1 s
Band 2	1 kHz - 10 kHz	100 Hz	50 Hz	0.015 s	1 s
Band 3	10 kHz - 150 kHz	1 kHz	500 Hz	0.015 s	1 s

Follow the EUT test procedure described in 5.17.3.4.