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Recent content by UtrasoundGuy

  1. UtrasoundGuy

    ringing in logic chip

    id still like to know why the resistor on the dead end of a IC (only going to the probe) would effect its output measured on both sides. There should be no current, I guess it might just dampen the alternating current sharp pulses I dunno. thanks all
  2. UtrasoundGuy

    ringing in logic chip

    sorry if I didn't mention it earlier, but this console that seems have a ground loop. I thought I had said this. The DC steady state region of trigger pulse going into the AND gate goes to as low as -400mv. This pulse is also effected by negative overshoot as much as 1V as was mentioned in...
  3. UtrasoundGuy

    ringing in logic chip

    skogsgurra - I appreciate that you are trying to help me out.. However, that last post was very insulting. Your comments are useless to me as they are very basic nor you dont seem to take the time to read the facts that presented, all of them (such as the ground loop and unplugging the NI card...
  4. UtrasoundGuy

    ringing in logic chip

    I frequency do the probe calibration that is built into the Agilent oscilloscope we are using. I had did one yesterday when I saw this output due to confusion. Many the calibration is not at the right frequency, its a built into the scope thing.. I haven't tried with an old generation of AND...
  5. UtrasoundGuy

    ringing in logic chip

    with 300ohm in series to oscilloscope probe (green is output, yellow input to FG) http://files.engineering.com/getfile.aspx?folder=6b310273-fa2c-4430-ab9c-4b9eb040d994&file=scope_59.bmp without 300 ohms in series to oscilloscope probe (green is output, yellow input to FG)...
  6. UtrasoundGuy

    ringing in logic chip

    In some ways, this is a new issue. The last issue had to do with the input to the chips and why they were breaking. This is the output of the chip and it seems to occur independently of what is done on the input side (filtering it or not). IRstuff - for practical purposes, that is the entire...
  7. UtrasoundGuy

    ringing in logic chip

    I forgot to say, if we scope U53 which is utilizes the output of U54, the chip output appears to be functioning correctly. So it unlikely the next chip is broken and is causing loading. This is not for one board, it is a design issue effecting all the boards. for some reason, it has a history...
  8. UtrasoundGuy

    ringing in logic chip

    this should be a simple question as its only a 1 (maybe 2 part) logic device. in this circuit, U54 is an AND gate and which combines a DC signal (as far as we are concerned it wont switch) with a negative pulse. The negative pulse goes from 5V to 0V for 500ns and then goes back to 5V for the...
  9. UtrasoundGuy

    cause of AND gate breaking

    thanks again everyone. I think that we have some understand of this but im going to do a different post for some help on this to the new point that we are at.
  10. UtrasoundGuy

    options for degassing water

    thanks again!
  11. UtrasoundGuy

    options for degassing water

    thank you bimr. awesome answer I guess we don't even need the marcor as we are not filtering, just degassing. any other ideas on other vendors?
  12. UtrasoundGuy

    options for degassing water

    Hello All We have a medical device that requires degassed water to 3ppm. We are able to circulate water though a filter at about 300ml a minute and degass the liter of water to 3ppm in around 5 to 10 minutes. The current solution we have is working, it involves circulating water through a...
  13. UtrasoundGuy

    cause of AND gate breaking

    Id like a second option on this just because its for an established product. We have an ultrasound medical iamging device which has a motor attached to it. The motor is a galil controller. The galil controller issues triggers via a 3V high off signal which is converted to 0V for the trigger...
  14. UtrasoundGuy

    oscillator noise - (sustaining engineering)

    But we eventually used 5 different types of programmable oscillators and were able to get all to work in our existing 10 year design. I think we just got a bad batch of oscillators from the vendor. The noise turned out to be somewhat unrelated to the issue.. It turned out if too long of a...
  15. UtrasoundGuy

    oscillator noise - (sustaining engineering)

    its starting to look like this is just RF noise. However, why it is larger amplitude for some chips than others is unknow but thanks for the help everyone
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