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  1. scottydoesntknow

    Temperature gradient in 3 zone laboratory furnace?

    It was the silver bullet, alright. And I didn't even need any equations or theories. Thanks a bunch. I produced power vs. time plots for all three zones and it showed most of the power being diverted to the top and bottom zones with the center eventually going to almost no power. The...
  2. scottydoesntknow

    Temperature gradient in 3 zone laboratory furnace?

    I hadn't considered using that example... It makes perfect sense. I think that might be straightforward enough that some kind of understanding can be reached before the eye-glazing begins. I'll give this approach a go and post back with the results soon! Thanks!
  3. scottydoesntknow

    Temperature gradient in 3 zone laboratory furnace?

    It was expected. Don't get me wrong, I'm not trying to understand what's going on here. I'm trying to convince my superiors (non-engineers who do not quite understand heat transfer and controls) that this is how it works. I'm not a thermodynamics expert by any means, I'm a computer engineer...
  4. scottydoesntknow

    Temperature gradient in 3 zone laboratory furnace?

    For 3 zone control, obviously, top sensor goes to top zone, middle to middle and bottom to bottom. This control mode gives fantastic control. Control gets better at temperatures above 1000. From what I understand this is where radiation starts replacing convection as the primary mode of heat...
  5. scottydoesntknow

    Temperature gradient in 3 zone laboratory furnace?

    They are 21 amp Satec 3 zone split tube furnaces, so they are radiant furnaces. The thermos are wire tied to the specimens and in full view of the furnace elements. I suspected that they would be sensitive to that kind of energy.
  6. scottydoesntknow

    Temperature gradient in 3 zone laboratory furnace?

    This is a surprisingly difficult control question with required details. I am putting together a stress rupture testing laboratory that uses 3 zone furnaces for elevated temperature testing. I have run into a roadblock with some nonbelievers that refuse to accept that temperature gradients...
  7. scottydoesntknow

    Error mech.c: 232 type error: pointer expected

    could you fill in a little more about the code, maybe a more complete listing? is the error generated by a compiler, or when matlab interprets the s-file? I'm not real familiar with s-code and matlab, but I could help with the C.
  8. scottydoesntknow

    Binary Square Root

    have you tried compiling a small program that does a sqrt() and looking at what the assembler comes up with?
  9. scottydoesntknow

    Visual Basic

    wareagle, FrancisL is right, you might want to use a database of some sort with VB. You CAN use pointers in vb, but the method is a little bit of a hack and not really necessary unless you are sorting objects of moderate size. vb should be relatively easy for you to pick up if you have any...
  10. scottydoesntknow

    intercepting external process messages

    nbuckska, this is exactly what i had in mind. So, you're saying that the function forwarding via a DLL might be the best method for doing this? By the way, I appreciate all the help on this.
  11. scottydoesntknow

    intercepting external process messages

    <------------------------------> National Instruments has a feature for 488.2 cards called NI-Spy that monitors API calls. I do not know if it works for other manufactures GPIB cards, but it may be worth looking into. Here is a link, it is mentioned on the 3rd page of the Adobe document...
  12. scottydoesntknow

    intercepting external process messages

    I have 250 testing machines, I can't really afford to install a large number of logic analyzers in the lab. It needs to be done in the software somehow across different contexts.
  13. scottydoesntknow

    intercepting external process messages

    ok there seems to be at least two ways to accomplish this, 1) is to install hooks and look for certain messages but the problem with this is how do I find out what the messages are that I'm looking for 2) rip apart the dll that I need to monitor, make a new one with stubs to all the function...
  14. scottydoesntknow

    intercepting external process messages

    is there a way to intercept an arbitrary process's messages? I need to develop a QC program that monitors a testing program . that program uses a IEEE488 card to do the work. I need to know unobtrusively if that program is using the IEEE488 card, i could care less what the transmissions are...

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