EMFs at the Grand Hotel Reykjavik

A friend passed this along to me today – so interesting / refreshing to see an organization care about EMF, and have a healthy and science based approach to minimizing these.

There are so many “smoke and mirrors, fear and magic” products, practitioners, etc. out there (especially in the world of yoga, new age, holistic health), that when a friend mentions EMF I usually have to hold my tongue to avoid getting into an argument.

Iceland EMF Plaque

When Power Conditioners Go Bad

We recently came across what appeared to be the worst power quality (as measured by voltage waveform, distortion, and regulation) we’ve ever seen (Fluke 1750 power analyzer). Power quality this poor is rather inexplicable – hard to imagine anything working well with this sort of power.

However, we’ve been analyzing power quality data for this particular client since 2003 (over 4000 individual reports) so we researched our surprisingly complete and useful database, and realized that we had reviewed this same site and same piece of equipment several years back (2009 and 2010), using an RPM 1650 power analyzer. At that time, the power quality was not only much better, it was nearly perfect. The equipment, in fact, appeared to be supplied via a UPS or power conditioner (make and model not indicated).

Since the power conditioner or UPS was dedicated to the medical imaging system, no other loads within the facility were affected. Clearly, the device feeding the equipment has failed or aged out of useful service – and needs to be bypassed (to start) and then repaired or replaced. We think you’ll agree….

Snapshot New

Voltage waveform (Phase B) in 2015 shows high levels of voltage distortion. Voltages were also highly imbalanced across three phases.

Snapshot Old

Voltage waveform (Phase B) in 2010 shows nearly perfect voltage with very low levels of distortion.

Harmonics New

Voltage harmonics (2015) show 3rd, 7th, 9th, and 13th far higher than 5% of fundamental, with total harmonics exceeding 25% THD.

Harmonics Old

Voltage harmonics (2010) were very low – with a small peak near the 33rd harmonic, typical of UPS or power conditioner switching frequency.

RMS New

Voltage and Current RMS logs (2015) show high voltage, many voltage swells, and poor regulation. Voltage imbalance (across all phases) was also very high.

RMS Old

Voltage and current RMS logs (2010) show very tight regulation, with small fluctuations related to load changes, typical of a static power converter.

Adventures in (ancient) HTML – Jeopardy

In this week’s “adventures in self employment”, I re-purposed a Jeopardy game (hard code HTML) that I developed back in 1998 for a corporate gig, for a friend’s church event. The friend was the event / production client back in the day so of course remembered the game.

Jeopardy Screenshot 1

It’s designed to run on a PC / laptop, and a scan converter used to crop to the game board for projection (leaving the controls on the right side of the laptop, offscreen). Reportedly, 2015 tech (touchscreen) makes this even easier to operate (I was doing it with a mouse, back in the day). Note the controls for “Black Screen” (useful for a broadcast or projected meeting) and also “Event Logo” (useful for a meeting slate). Sneaky trick: I used the browser / html “followed link” function to set the number values to the same color as the background (thereby rendering them invisible) – you just need to clear the browser history to reset the game board. The links / content are still there – just can’t see them 🙂

Jeopardy Screenshot 2

I was relieved that the IE “non-standard” code I used to play the sounds <bgsound> is still valid. And also that I still have the HTML mad skillz to tweak the template a bit – added a “buzzer” feature and resized the screen to take advantage of larger displays – in short order. Also, the fact that I still had the game stashed in my archives, 18 years later.

Jeopardy Screenshot 3

The best part – the entire game, compressed, with graphics and sound effects, under 150KB.