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    141220-1502 EST An additional experiment. This...

    141220-1502 EST

    An additional experiment. This is an AC experiment in contrast to the previous one that was DC. Goal to see how leakage flux relates to saturation. Three measurements relative to...
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    141219-0910 EST ActionDave: I thought my...

    141219-0910 EST

    ActionDave:

    I thought my statement was relative clear. But I will restate it differently. If you use the 240 legs from the center tapped transformer of a wild leg delta system,...
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    141218-2341 EDT If you have a 240 V delta with...

    141218-2341 EDT

    If you have a 240 V delta with a wild leg this means to me that most probably you have one large 240 V center tapped single phase ultility transformer, and one or two smaller...
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    141216-1217 EST Some additional experiments: ...

    141216-1217 EST

    Some additional experiments:

    Same transformer primary. DC excitation of primary. Hall device on transformer side in position that provides the greatest signal. 5 V excitation to...
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    141215-2147 EST winnie: I do not remember...

    141215-2147 EST

    winnie:

    I do not remember exacly how I switched the transformer primary. The secondary was unloaded. and the transformer I used was an A41-175-16 made by Signal Transformer.
    ...
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    141215-1502 EST winnie: The reason is...

    141215-1502 EST

    winnie:

    The reason is different initial residual. One residual was negative of the other. I have to leave at the moment. I will be back later this evening.

    .
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    141214-0811 EST winnie: The residual flux...

    141214-0811 EST

    winnie:

    The residual flux state in an iron core inductor is a function of the hysteresis curve and the current turn off point. In an unloaded transformer driven by a sine wave...
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    Inrush - inductors and capacitors

    141213-2009 EST

    I constant see comments on this forum that there is high inrush because the load is inductive. This is a totally incorrect statement.

    A true pure inductor can not have its...
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    141211-1621 EST Since HMI is simply an...

    141211-1621 EST

    Since HMI is simply an interface, and assuming that it requires 120 V power, then simply run the AC power cord along with the 8723 communication cable, and derive power and EGC...
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    141211-1323 EST Dennis Alwon: Thanks. I...

    141211-1323 EST

    Dennis Alwon:

    Thanks.

    I could not read the very small printing, could not expand it. Thus, did a search and this document was found...
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    141211-1152 EST Some additional experiments,...

    141211-1152 EST

    Some additional experiments, and a potential big problem.

    Experiments using a Kill-A-Watt EZ for most measurements.

    Same 180 VA transformer as above, but with no secondary...
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    141211-1052 EST Dennis Alwon: What is a "60...

    141211-1052 EST

    Dennis Alwon:

    What is a "60 watt electronic low voltage trany"?

    Is this an AC or DC output? If AC how close to a sine wave is the output?
    If AC is the waveform synchronized...
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    141211-1003 EST fifty60: At 20 ft and 9600...

    141211-1003 EST

    fifty60:

    At 20 ft and 9600 baud Belden 8723 will work fine. This has a drain wire that I would connect at one or both ends. Keep in mind that the RS232 common is already...
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    141211-1300 EST Time limit problems. An...

    141211-1300 EST

    Time limit problems.

    An additional point. Make sure that the DC component of the dimmer output current is negligible. In my experiment I had about 0.06 A DC with 0.25 A AC. DC...
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    141210-2344 EST AZsparky: In your first...

    141210-2344 EST

    AZsparky:

    In your first post calling a normal transformer a magnetic ballast was totally misleading.

    If your "cans" contain a closely coupled normal transformer with the...
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    141210-1630 EST What is a "can" with a...

    141210-1630 EST

    What is a "can" with a magnetic ballast? I doubt that a "can" has anything to do with your question. What is in the "can" is the import information? Is it a fluorescent or...
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    141210-1453 EST dfmischler: Thanks. Mind on...

    141210-1453 EST

    dfmischler:

    Thanks. Mind on the subject is not connected mind controlling fingers.

    .
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    141210-1442 EST i don,t believe you have a...

    141210-1442 EST

    i don,t believe you have a Cree 65 watt bulb. My guess is that it is 9.5 watts.

    Is your dimmer a three wire dimmer? By this I mean does it require a neutral connection?

    .
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    141210-1421 EST pjwt712: You need to ask...

    141210-1421 EST

    pjwt712:

    You need to ask the machine manufacturer what is the purpose of the ground rod. Then depending upon the answer ask the manufacturer how the 100 ft rod accomplishes that...
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    141210-0947 EST fifty60: What is an HMI? ...

    141210-0947 EST

    fifty60:

    What is an HMI?

    You may need to ask some other questions. For example ---
    1. What is the distance between source and destination?
    2. What is the RS232 baud rate?...
  21. 141208-1954 EST iceworm: I am really...

    141208-1954 EST

    iceworm:

    I am really curious what instrument you used, or was it measured with V and I?

    Since my 1.5 V measurement comes close to your measured value. I suspect that your...
  22. 141208-1355 EST When the AC excitation...

    141208-1355 EST

    When the AC excitation frequency to the bulb is high compared to the thermal time constant of the filament, then there is little instantaneous variation in temperature, and the...
  23. 141208-1336 EST iceworm: On a 100 W 120 V...

    141208-1336 EST

    iceworm:

    On a 100 W 120 V bulb I read about 9.4 ohms with a Fluke 27. This applies about 0.004 V at this resistance level.

    With 1.56 V applied the current is 0.0813 A and a...
  24. 141208-1205 EST ruko: The resistance of a...

    141208-1205 EST

    ruko:

    The resistance of a tungsten filament incandescent bulb has a very large change in its measured resistance as you change its applied voltage. I ran an experiment last...
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    141207-2232 EST The human eye and brain...

    141207-2232 EST

    The human eye and brain combination can detect light intensity changes much smaller than that of a 1 V change.

    In 1953 I was a subject in an experiment on signal detectability...
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