Category: Steve’s Blog

Impact of the high magnetic field and RF power in a superconducting cyclotron on the operation of a nearby MRI facility

The University Hospitals Cleveland Medical Center in Cleveland, Ohio, decided in 2011 to add proton therapy to its existing radiation therapy equipment in order to provide broader services to its cancer patient population.  The Mevion S250 Proton Therapy System (PTS) was chosen for its compactness and state-of-art technology in a rotational superconducting cyclotron. Geographically, the […]

Review of MIL-STD-1399-300-1 Requirements

Introduction The electrical power system of a ship functions like a city’s electrical grid from the power generation to medium voltage distribution to the low voltage networks located in various sections of the ship’s structure. It only makes sense to treat the power system like a city’s power system, after all larger vessels include services […]

Review of MIL-STD 704 Requirements

Introduction This article discusses the power quality test and evaluation with a review of MIL-STD-704 and the relationship with electromagnetic compatibility (EMC). MIL-STD-704 deals with aircraft electric power characteristics, and provides the standard to ensure compatibility between the aircraft power system (including external power) and the utilization equipment. MIL-STD-704 covers the power generation system by […]

MIL-STD-461 CS101 Test Method Review

1. Introduction Discussions with various members of the electromagnetic compatibility (EMC) community that deal with MIL-STD-461 testing revealed that various methods were being used to limit the applied power in CS101 testing. The standard calls applying a test voltage level but allows for the requirement to be met if the interfering signal power source is […]

Review of MIL-STD-464 Requirements

Introduction My reviews have covered MIL-STD-461 over the past few months so it’s time to step up to the system requirements. We realize that the MIL-STD-461 requirements apply to equipment items and subsystems as stated in MIL-STD-464. Revision “C” is the current edition, but a review is a little overdue. In this review, the discussion […]

Review of MIL-STD-461 General Requirements

Introduction Recently I noted that my series on MIL-STD-461 test methods was closing since I had accomplished a review on each of the test methods. It seems appropriate to continue with a review of General Requirements – those things common to the various test methods. These requirements have been around since the first release of MIL-STD-461 […]

Review of MIL-STD-461 CS116 Damped Sinusoidal Transients, Cables and Power Leads

Introduction In this article, I am delving into the evolvement of CS116 testing, the background, the purpose and how the testing is approached today. The test title is, “Conducted susceptibility, damped sinusoidal transients, cables and power leads”. MIL-STD-461 assigns applicability to a broad variety of applications and states the purpose to is to verify the […]

Review of MIL-STD-461 RE103 Antenna Spurious and Harmonic Outputs

Introduction Technology frequently embeds transmitters in a myriad of devices to support an Internet Of Things (IoT) concept from identification to condition-based actions, and this IoT approach includes defense operations. Devices may include multiple transmitters that a few years ago did not include communications of any sort. Inclusion of RF transmitters has prompted a significant […]

Review of MIL-STD 461 CS115 Impulse Excitation; CS109 Structure Current; RS105 Transient Electromagnetic Field

Introduction I realized earlier that my reviews have covered most of the MIL-STD-461 test methods in the past year, so I decided to prepare this to capture those items that have been omitted in prior articles. Since this is a series close out and the topics have little in common, I’ll take on each instead of […]

Review of MIL-STD 461 CS103 Intermodulation, CS104 Rejection of Undesired Signals and CS105 Cross-Modulation

Introduction  Rapid technology advances in the wireless communications world makes test and evaluation of Radio Frequency (RF) devices a difficult subject.  It seems that by the time a new device hits the market, it has been made obsolete by the next generation.  I recall hearing from a major electronics manufacturer CEO that 90% of sales happen within 90-days of market […]