I ordered 5 RPi's from Newark on 11/17, and the latest status on the web site is "Expected Ship Date 10 Dec 2012". Naturally they said they were in stock the moment I ordered them.
I was countering your assertion that one needs to buy a special device to measure 240V or high current 120V circuits that can't be measured with a kill-a-watt. That's a single circuit device. I think we're in fierce agreement.
I went to the link you provided for the TED device - that's pretty nice.
Your comments are mostly valid, however not germane to the question asked (How can I determine peak load on a circuit?)
Of course you'll have no way of knowing if the peak current measured by each meter occurred at the same time, since you won't know when it happened
The question was peak load per circuit. Most high current devices in the US are 240V only (a tiny amount of current travels on the neutral for 120V things like light bulbs, etc). There is no need for two meters since the current is guaranteed to be balanced between the two 240V legs.
If you do have significant neutral current, you can measure it directly. To determine time correlation, you can put pairs of conductors in the meter - you'll get the sum/difference of the currents, depending on their relative phases. You can learn a lot from that.
I'm with you. I have a whole house 20kW generator and 1000 gal propane tank, and it's very close to perfectly sized for my house.
I don't want to deal with worrying while I'm not at home that the AC is on or that the oven was on or the clothes dryer was running. My generator will start and run every motor in the house.
I have 6x125 Ah batteries w/ a 2400W inverter that runs the servers, DVR, NAS, gb switch, etc while the gen starts.
I was in the Cayman islands when Sandy was supposed to hit central Va, and I didn't have to worry too much about the dog sitter having to live in a 'dead' house while I was gone. It was a nice feeling not to have to worry.
Buy a clamp-on ammeter with a peak hold function. That'll go a long way in helping determine max current draw. If your power factor is close to unity, the real power used equals the apparent power, which is I * V (current * volts). Even if your power factor is not close to unity, the apparent power is what a generator has to supply, so that number is actually more useful than the real power draw.
The encryption I mention isn't to prevent modification, it is to make it unviewable until approved by court order (in the first case), make modification evident, as you said, as well as marking the source of the video with a cryptographically-secure tag. (This video was taken by camera S/N 12345, issued to officer yyy at date/time xxx, etc).
I addressed that in the original post. As long as there's a pristine copy of the video that can't be modified or hidden, then viewing immediately is fine. That's a really big if, of course.:-)
If they can view it, they can choose to 'lose/destroy' the physical video if it does not help their side of the story. I'd rather both sides of a trial get the video sight-unseen without knowing if it'll help them or not.
I don't think the public will or should ever be able to see all the recordings at will.
I would go one step further - the police departments shouldn't be able to view the video routinely. That would allow them to cherry-pick which segments get 'lost' before a trial. I say that the glasses encrypt the video and only a court order gets it decrypted.
I realize that having the police be able to review video at will could help apprehend suspects that appear on the video but get away. I would be ok with the video being available for instant review only if there's a way to guarantee that an encrypted, non-deletable, non-modifiable copy has been uploaded somewhere (perhaps uploaded via their patrol car). A flight of fancy I realize, but one can hope.
"... exposure due to the normal potassium content of the human body, 2.5 g per kg, or 175 grams in a 70 kg adult. This potassium will naturally generate 175 g × 31 Bq/g 5400 Bq of radioactive decays, constantly through the person's adult lifetime."
In the old days, we had exactly what you describe with regard to protocol optimization. A company I worked for used VSAT comms to all their stores, and the VSAT hardware would spoof the IP and X-25 protocols on either earthbound end. What went over the sat link was a very optimized protocol tailored for the relatively long double hop delay.
I agree that radio has a place, but I think you've missed the gist of what using SMS gains.
For someone to hear an outside message with a radio, they must first know about and want to hear the message badly enough to perhaps risk their life hiding a radio.
For someone to hear an outside message via SMS, they must only have a 'party approved' cell phone. They don't have to know anything else - the message is pushed to them without their knowledge (or consent), and they can plausibly deny that they wanted to receive that message to their government. Nothing to hide from the NK gov't, no repercussions from having a radio.
Perhaps send an SMS telling them what frequency to tune in to for further 'truth'?
No argument there, I clearly understand the utility of broadcast radio propaganda. Are typical NK citizens allowed to own SW radios that receive 'Despicable Western Decadent Broadcasts (tm)' ? If not, owning one could get you killed. For a radio to be useful to a propagandist, the citizen has to actively tune in to get the message. Sending unsolicited text messages gets the message across whether the recipient wants it or not.
I don't know if it was factual or not, but such a ruse was depicted in the movie Midway - they mentioned in the clear that the water plant was not operational on Midway. The Japanese used their secret designation 'AF' for Midway when they reported the outage, proving that 'AF' was Midway. Here's a better description that's likely factual - see the "Critical Intelligence" section.
Could this be an opportunity for South Korea (or any other western government) to send their own daily propaganda text messages to phones in NK? All it would take is a fake cell site just over the border, on a (very high) flying aircraft/drone, or on a ship outside territorial waters. Having radio-based technology in the hands of the masses in NK can work for _and_ against the current government.
Nope - as a previous posting says, those are the ID numbers of the carrier pigeons. I quote:
"(NURP stands for National Union of Racing Pigeons). This probably has nothing to do with the message. The 40 and 37 indicate the year of registration and TW194 and DK76 are the "serial numbers" of the pigeon."
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I ordered 5 RPi's from Newark on 11/17, and the latest status on the web site is "Expected Ship Date 10 Dec 2012". Naturally they said they were in stock the moment I ordered them.
I was countering your assertion that one needs to buy a special device to measure 240V or high current 120V circuits that can't be measured with a kill-a-watt. That's a single circuit device. I think we're in fierce agreement.
I went to the link you provided for the TED device - that's pretty nice.
I'm going to go out on a limb here and guess alkaloids.
Do you think they found the tin the altoids came in, or just the mints themselves?
I thought that was from "Ender's Game", but now I'm not so sure. How about the "Octospiders" from the Rama series, particularly "Rama Revealed"?
Your comments are mostly valid, however not germane to the question asked (How can I determine peak load on a circuit?)
Of course you'll have no way of knowing if the peak current measured by each meter occurred at the same time, since you won't know when it happened
The question was peak load per circuit. Most high current devices in the US are 240V only (a tiny amount of current travels on the neutral for 120V things like light bulbs, etc). There is no need for two meters since the current is guaranteed to be balanced between the two 240V legs.
If you do have significant neutral current, you can measure it directly. To determine time correlation, you can put pairs of conductors in the meter - you'll get the sum/difference of the currents, depending on their relative phases. You can learn a lot from that.
I'm with you. I have a whole house 20kW generator and 1000 gal propane tank, and it's very close to perfectly sized for my house.
I don't want to deal with worrying while I'm not at home that the AC is on or that the oven was on or the clothes dryer was running. My generator will start and run every motor in the house.
I have 6x125 Ah batteries w/ a 2400W inverter that runs the servers, DVR, NAS, gb switch, etc while the gen starts.
I was in the Cayman islands when Sandy was supposed to hit central Va, and I didn't have to worry too much about the dog sitter having to live in a 'dead' house while I was gone. It was a nice feeling not to have to worry.
Buy a clamp-on ammeter with a peak hold function. That'll go a long way in helping determine max current draw. If your power factor is close to unity, the real power used equals the apparent power, which is I * V (current * volts). Even if your power factor is not close to unity, the apparent power is what a generator has to supply, so that number is actually more useful than the real power draw.
Your pharmacist has lots and lots of scruples, too.
The encryption I mention isn't to prevent modification, it is to make it unviewable until approved by court order (in the first case), make modification evident, as you said, as well as marking the source of the video with a cryptographically-secure tag. (This video was taken by camera S/N 12345, issued to officer yyy at date/time xxx, etc).
I addressed that in the original post. As long as there's a pristine copy of the video that can't be modified or hidden, then viewing immediately is fine. That's a really big if, of course. :-)
If they can view it, they can choose to 'lose/destroy' the physical video if it does not help their side of the story. I'd rather both sides of a trial get the video sight-unseen without knowing if it'll help them or not.
Only if you read the paperback edition. The hardback edition is a guaranteed broken nose.
I don't think the public will or should ever be able to see all the recordings at will.
I would go one step further - the police departments shouldn't be able to view the video routinely. That would allow them to cherry-pick which segments get 'lost' before a trial. I say that the glasses encrypt the video and only a court order gets it decrypted.
I realize that having the police be able to review video at will could help apprehend suspects that appear on the video but get away. I would be ok with the video being available for instant review only if there's a way to guarantee that an encrypted, non-deletable, non-modifiable copy has been uploaded somewhere (perhaps uploaded via their patrol car). A flight of fancy I realize, but one can hope.
That's Dunkin' Donuts, you heretic. Dunkin' as in dunkin' them in your coffee.
So they've created on-demand wireless token ring (really token-bus, given the topology) except that the AP controls who gets the token?
Have they found Genesis? Genesis allowed is not! Is planet forbidden!
My source says it's more like 5400 Bq:
"... exposure due to the normal potassium content of the human body, 2.5 g per kg, or 175 grams in a 70 kg adult. This potassium will naturally generate 175 g × 31 Bq/g 5400 Bq of radioactive decays, constantly through the person's adult lifetime."
1000 Bq is about 67 BED (Banana-Equivalent Dose).
Awesome "Forbidden Planet" reference. Kudos to you, sir.
In the old days, we had exactly what you describe with regard to protocol optimization. A company I worked for used VSAT comms to all their stores, and the VSAT hardware would spoof the IP and X-25 protocols on either earthbound end. What went over the sat link was a very optimized protocol tailored for the relatively long double hop delay.
I agree that radio has a place, but I think you've missed the gist of what using SMS gains.
For someone to hear an outside message with a radio, they must first know about and want to hear the message badly enough to perhaps risk their life hiding a radio.
For someone to hear an outside message via SMS, they must only have a 'party approved' cell phone. They don't have to know anything else - the message is pushed to them without their knowledge (or consent), and they can plausibly deny that they wanted to receive that message to their government. Nothing to hide from the NK gov't, no repercussions from having a radio.
Perhaps send an SMS telling them what frequency to tune in to for further 'truth'?
No argument there, I clearly understand the utility of broadcast radio propaganda. Are typical NK citizens allowed to own SW radios that receive 'Despicable Western Decadent Broadcasts (tm)' ? If not, owning one could get you killed. For a radio to be useful to a propagandist, the citizen has to actively tune in to get the message. Sending unsolicited text messages gets the message across whether the recipient wants it or not.
I don't know if it was factual or not, but such a ruse was depicted in the movie Midway - they mentioned in the clear that the water plant was not operational on Midway. The Japanese used their secret designation 'AF' for Midway when they reported the outage, proving that 'AF' was Midway. Here's a better description that's likely factual - see the "Critical Intelligence" section.
Could this be an opportunity for South Korea (or any other western government) to send their own daily propaganda text messages to phones in NK? All it would take is a fake cell site just over the border, on a (very high) flying aircraft/drone, or on a ship outside territorial waters. Having radio-based technology in the hands of the masses in NK can work for _and_ against the current government.
Ok, I'll have 500g of Bovine Psoas Major proteins, preferably with some cured porcine abdominal protein wrapped around it.
Nope - as a previous posting says, those are the ID numbers of the carrier pigeons. I quote:
"(NURP stands for National Union of Racing Pigeons). This probably has nothing to do with the message. The 40 and 37 indicate the year of registration and TW194 and DK76 are the "serial numbers" of the pigeon."