Recent content by udirn1

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...

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...

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.

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...

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?

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...

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

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

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...

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

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

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...

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...

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

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...