Smart meters

I would phrase that as "may" be possible, but very unlikely.

It would be easy enough with just one as long as the TV is showing a broadcast channel and has a backlight that changes with what is on the screen.

I do check my bank statements very carefully and there have not been any extra charges.

In message , at

I can see I'll never convince you, so why don't we agree to disagree.

In message , at 06:26:32 on Fri, 13 Mar 2015, john james remarked:

If it can be done for one, it can be done for two. Just as it can be done for the components from a fridge freezer and an electric kettle, at the same time as other things like lights are also drawing current.

In message , at 09:48:28 on Fri, 13 Mar 2015, john james remarked:

Which they do, because of the "dynamic contrast" feature.

In message , at 06:29:58 on Fri, 13 Mar 2015, john james remarked:

The mechanism involved would be much more complicated if one were to attempt to apply to anything other than one of the programmes being transmitted live. To that extent common sense substantiates my claim that those are the ones which might be looked for.

No, because there is no way to work out what current one TV is taking from the total house current when there are two running.

That is a different situation entirely, those are fixed currents when a particular device is turned on. With a TV the current taken by the backlight varies continuously with the program content and so while its possible to work out what variable current is due to a single TV, it will never be possible to work out which current each TV is taking when both are running at the same time with different programs being watched on each one.

Yes, that was never in dispute.

Impossible actually even with just one TV.

It would also be possible to look for say the most recently released movies and see if one of those is being watched as well. But never going to be possible to always work out what is being watched, even with just one TV.

But how will you measure the backlight current ?

The fragmentation where the DNO (operator) is not responsible for metering within their own area has to be an issue.

Also what is the granularity of the metering, they certainly meter at the grid supply point, but that is (usually) 132kV and there is a lot of infrastructure below that point.

Maybe end user meter readings are shared and totalised within an area but that still leaves a lot of legitimate unmetered supplies such as lights and fixed line comms infrastructure.

In message , at

It's between 1/3 and 2/3 (depending on the viewed content) of the set's overall consumption. Unless I'm very much mistaken there's a meter looking at the household's total consumption - one contributor to which is the TV.

In message , at 21:30:17 on Fri, 13 Mar 2015, john james remarked:

I think we've reached the end of the road here. Deny it as much as you wish, it's your funeral.

In message , at 21:34:25 on Fri, 13 Mar 2015, john james remarked:

Do make your mind up!!

Which is why I keep saying that this snooping is RESTRICTED TO PROGRAMMES LIVE ON TV.

You appear to have an extraordinarily short attention span.

I'll ask again how will you measure the *backlight* current.

So on the TV you have a silent B&W movie and next is the lastest action fil m. As the volume goes up and down this also changes the current consumption of the TV. Also while watching the TV I might be using my computer increasin g teh brighness of the screen the power consuption nof my iMac almost doubl es and almost doubles again if I push teh grahics processor. Yep I've had 4

It is much harder with LCD screens than with classical CRTs where it was possible to reconstruct the screen display from stray RF emissions.

I reckon he could use the gridwatch stats to calculate that ;-)

You've forgotten to includethe effects of the power factor corrected switched mode supplies!