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  1. udirn1

    Heat transfer equation

    Dear follow engineers. I need your kind help. I have a device which emits rf energy when touching the skin. Because of this energy, the tissue heats up. Now, there are 2 options: 1. If I place a non conductive lotion on the skin (high impedance), and then apply the rf energy, most of it will...
  2. udirn1

    Patient leakage current

    Thanks Actually I am using a floating o scope measuring ac vrms on the resistor going to gnd.so I believe the measurement is ok.but I cant grasp from where this current is coming from...
  3. udirn1

    Patient leakage current

    Hi The diagram was attached. I am emitting an RF signal, approx 100 V rms on a 200 ohm load, in sequence to the load another 200 ohm resistor is connected to the wall gnd, and then I measure on that resistor the voltage to see how much current is flowing to gnd.
  4. udirn1

    Patient leakage current

    Hi Bill, I have attached a schematics describing the test. This is a medical device which is emitting a 1 MHZ RF signal via a handpiece. According to the standard, the leakage current to earth must not exceed 50mA whilst I receive 65mA. I have tried already to place a Toroid on the GND line...
  5. udirn1

    Patient leakage current

    Hi all, I have a strange situation.when I test my device for patient leakage current, I fail the test hence there is leakage current flowing through gnd. I tried to disconnect the gnd from device and retest and surprisingly it didn't change ..any idea?
  6. udirn1

    Ripple Voltage

    Hi, Thanks for the elaborated answer. However, as I explained in my initial thread those 22n caps connected to gnd are suspected to leak into gnd, so I removed them along with the 0.5M ohms resistors, and that's when I got the ringing at the output, so someone put them there to smoothe out the...
  7. udirn1

    Ripple Voltage

    Hi I hope the last diagram is more understandable.would appreciate your feedback whether snabbers would contribute to eliminate the ringing and what would be the recommended values .do I place them in parallel to each switch instead of the 0 ohm res? Thanks
  8. udirn1

    Ripple Voltage

    Thanks for your insights. I am attaching the "bigger" picture- in deed I cant see any snubbers around? https://files.engineering.com/getfile.aspx?folder=75194611-bf93-48b7-8aee-6dfbc2b8a0b3&file=1.jpg
  9. udirn1

    Ripple Voltage

    Hi Kieth, I need to eliminate the leakage current as I cant pass the safety tests there's a leakage current coming from this circuit so I figured it had to do with either the resistors or caps.when I remove the caps I see this ripple, which is unwanted as well...
  10. udirn1

    Ripple Voltage

    Hi Bill I doubt that the resistors have any significance, however, how would you suggest connecting the caps? Udi
  11. udirn1

    Ripple Voltage

    Hi Kieth Thanks, I thought I had uploaded it. Trying again... Udihttps://files.engineering.com/getfile.aspx?folder=9eb7efa9-6e51-4990-8569-df29748bfc55&file=Screenshot_20210616-204525_WhatsApp.jpg
  12. udirn1

    Ripple Voltage

    Hi all, I have a tense circuit which outputs a bi phasic square signal at 12.5 hz. Apperantely it is creating a leakage current on the gnd line through the capcitors/resistors at the outputs which are connected to gnd.when u removed them, to keep the output floating, I receive a signal with...
  13. udirn1

    tablets

    Thanks all. I have upoaded a few pictures to give you a beeter understandin of this issue. the capsule needs to be exposed as it needs to touch a second surface during the process. I have uploaded 4 pictures as follows: 1. Broken capsule residue on mediator...
  14. udirn1

    tablets

    Mediator is also used as a material that mediates or acts like a medium between 2 materils.hope i am clearer now.
  15. udirn1

    tablets

    Hi all i hope fhis is the correct place for this kind of questions.. i have a project where i need to glue a capsule or a tablet which is round shaped to a round shaped plastic mediator.this whole assembly at the end will be clinked to an handle to preform a certain task.the problem i have is...
  16. udirn1

    RF output signal

    Hello All I am to design a simple and cheep (as possible) a signal generator that would produce an output RF signal @ 1MHZ that would be able to produce about 30-35W dissipated upon 200 ohm load. Its possible to use 2 sync modules that produce less power each one that would work together with...
  17. udirn1

    Cable fatigue

    Scotty and all Thanks again. I was looking through "heyco" site, and I came about the following : http://heyco.com/products/sec_03/3-17b.html Whats the difference from what scotty had mentioned? Udi
  18. udirn1

    Cable fatigue

    Hi Guys Thanks for your support- brian- will look into the pig tail connector.Thnaks Chicopee - I was referring to the inner conductors.This cable is comprised of 4 thick wires to conduct an RF signal and 8 thin ones for control.Usually the thinner ones break. Kenat - I tried using a spring...
  19. udirn1

    Cable fatigue

    anyone???
  20. udirn1

    Cable fatigue

    Thanks for the reply. I need nothing special, but need it it avilable fast and to match to current plastic design with minimum changes. Could you direct me to the connectors solution? does it come on top of the plastic sleeve? Udi

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