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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

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...

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...

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...

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)...

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...

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...

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...

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.

thanks again!

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?

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...

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...

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...

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

as for the flying leads and ground inducatance to the probe, I know that they can show up in the signals. I had previolsy tried cutting the leads very short on oscillators to try to reduce this and even put in some thicker copper to the ground plane. This could still be an issue but I think...

thanks Bill and ComcoKid VEBill, very good find. I think this is a big part of the issue. Now that I think about it, although the design is working and has been for so long (10+ years), my evaluation of it is that it has never really been working right. This might be part of why the chip is so...

hello all. we have been using an oscillator with tristate (enable) function in our design for some odd 10 years. The company purchased enough to sit on the inventory up to about now as it was cheaper to do this. The newest batches that came in (slighly different version with better tolerance...

forgot to mention, this is without any load attached

we have the following DC to DC converter. It has been in use in our company for around 10 years without any major problems Im aware of. http://files.engineering.com/getfile.aspx?folder=744ad72e-fdf8-4c0f-b810-dc1304091600&file=Untitled.png The converter is capable of converting 15V DC to -200...