I hardly ever hear an ad with honest claims :-( ...Jim Thompson
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| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I do not suffer from stress, but I am a carrier.
That would be in large part because when you look closely, few ads make testable claims. There are always weasel words like "may", or the claims are just meaningless anyway.
Natch! But I also hear claims that are blatantly fraudulent :-( ...Jim Thompson
-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at
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| 1962 | I love to cook with wine. Sometimes I even put it in the food.
Certainly there are plenty of claims that have one meaning but are clearly intended to be interpreted as meaning something else.
An example I remember noticing from way back was a hair treatement that was "adsorbed" by the hair. That isn't a typo, and how many people would have ever come across the word? How many people would read it, or hear it, as "absorbed"?
We certainly have a whole class of citizens that are so ignorant they hear what they want to hear. On this side of the pond we call them Democrats ;-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
That is true. You can actually take the cover off a starter, and watch the process happen inside the little tube in the starter. At power on, it glows inside, generating heat, that makes the bimetallic contacts move together, which them shorts out the starter and stops the glow. this also allows the heaters to energise, until the tube starts and lights. At this point, the current flows through the tube and not the starter so it does nothing further until next switch on.
Something seems screwy with that explanation. IME (cold) starter is initially closed; power goes through old old style filaments in FL, in fraction of a second bimetallic strip heats up and contacts open, FL starts. Lamp current keeps FL filaments hot, glow current keeps starter contacts warm and open. By experiment over 40 = years ago as a kid.
It cant work as a normally closed (at cold) circuit. If the starter was normally closed initially, then it would keep turning the filaments on as it cooled down and closed again, killing the current through the tube and turning it off.
If it somehow was kept hot enough to stay open when the tube was running, this would be a waste of power, and probably reduce the life of the starter a lot.
If you remember that correctly, then your starter that you observed was not a usual glow switch starter.
There is the possibility in a few cases that a glow switch starter may glow while in parallel with the lamp, since the glow has positive resistance between a few milliamps and an amp or so. But I have observed a lot of glow switch starters and never seen that. That would be waste of some of the power that would otherwise go into the lamp.
I have even connected a few glow switch starters to ~150-300V limited to about a milliamp - they glow right off the bat. FS-4 usually needed more than 150V, but FS-2 and most others did not. On an ohmmeter, every one I tried came up open.
No. The starter is normally open. The starter is connected between the open ends of the lamp filament (the other ends go to the ballast an neutral.) The sequence at start up is:
1) Power applied.
2) Since the discharge in the lamp has not started the current through it is low and there is no voltage drop across the ballast.
3) The high voltage across the starter causes it to break down and have a glow discharge.
4) The heat from the glow discharge heats up the starter electrodes until the bimetallic strips cause the starter to short itout.
5) Current now flows through the ballast through the live end heater to the starter, through the closed contacts to the other filament and then to neutral - this causes the lamp filaments to heat up and since the discharge in the starter is stopped it cools down.
6) After a second or so the starter bimetallic strips cool down and the contact is broken.
7) The breaking connection causes a high voltage back-emf from the ballast which ideally will start the discharge in the lamp now the filaments are hot.
8) Since the lamp is now glowing it passes enough current through the ballast so that voltage across the lamp is only 80v or so (depending on lamp). This is not enough to break down the gas in the starter so there is no glow discharge in the starter and it cools down and remains open circuit.
9) The start sequence is now finished and will remain in this state while power is applied.
10) If the lamp did not start the voltage across it will be high enough to restart the glow discharge in the starter and the sequence repeats. This can also happen when the lamp is nearing the end of its life and the voltage across it when operating is enough to trigger the glow in the starter (the voltage across the lamp tends to increase as the lamp ages).
Take the cover off one, and watch it from the side when starting. You can actually see the contacts bend and move to each other, in that purple glow. you might have to extend it out of the fitting to get a good look in it.
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