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Tag: RE 102; MILSTD461F; MILSTD Testing;

Switching-Mode Power Supply Switching-Mode Power Supplies (SMPS) are used extensively in many electronic applications. Many manufacturers offer MIL-STD-461 compliant solutions, as well as Commercial Off-The-Shelf (COTS) solutions for military applications. SMPS offer many advantages when compared to Linear Power Supplies. The primary advantage of an SMPS is that it offers power conversion and regulation at 100% efficiency – albeit, given ideal components. All power loss is due to less than ideal components and the power loss in the control circuitry. Other advantages of the SMPS are smaller size and therefore less weight. SMPS have switching frequencies that range from 50 kHz to 1 MHz.

Published in MIL STD
  1. The RE102 test method in MIL-STD-461E required using a 41” rod antenna below 30 MHz with the counterpoise grounded to the ground plane, which called into question the accuracy of the measurement results above the 10 MHz frequency range. To address this, MIL-STD-461F requires that the counterpoise be isolated from the groundplane.

A client recently inquired as to whether it would be possible to see a reduction in radiated spurious emission levels on Spread Spectrum Clock (SSC) fundamental frequency and harmonics using Peak Detectors during MIL-STD-461F testing of a COTS product, when previous FCC Part 15 testing of the COTS product proved compliance using Quasi-Peak Detectors。 We are pleased to share our response: If COTS with SSC products with Part 15 compliant fundamental frequencies and harmonics are tested to MIL-STD-461F using required Peak Detectors, the spectral peaks of their fundamental frequencies and harmonics should comply with MIL-STD-461F, provided the SSC timing parameters are properly configured。 A properly configured SSC would produce lower spectral peaks of the fundamental frequency and harmonics in the SSC mode than the spectral peaks of the fundamental frequency and harmonics in the non-SSC mode by levels that are dependent on the manufacturer of the SSC, modulating waveform profile, modulation rate used to modulate the fundamental frequency clock frequency in the SSC mode, spreading rate style used (down, center or up) as depicted using (Δ) in Figure 1 below:

 
Published in MultiPoint Blog

Rhein Tech Laboratories, Inc。 is pleased to share a response we provided to a client’s recent request for an explanation of the measurement detector requirements in MIL-STD-461F product testing。 MIL-STD-461F requires peak detectors for all product testing。 MIL-STD-461F, paragraph A。5。1。1 (5。1。1) Units of frequency domain measurements states: “All frequency domain limits are expressed in terms of equivalent Root Mean Square (RMS) value of a sine wave as would be indicated by the output of a measurement receiver using peak envelope detection。”

Published in MultiPoint Blog
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