Spikes from Transmitter

What interface? Transmiting what? To what?
Why do they have spikes... any interface should be compilant with the relevant EMC spec's
Arooogah Aroogah Sarcasm Alert.
Is it possible to give any less information?
Del

One can easily avoid one of these spikes in your path using an ultrasound sonar or microwave radar transmitter. The difficult part will be the controller logic that must analyze the transponder information, decide on an alternate path, and then execute that decision.

Good communication skills in programming and all engineering is a necessity for success.

How many loops does the DCS support and how many loops have noise spike problems?

Are the noise spikes intermittent at different times of the day or always present?

Are the noise spikes associated with one particular part of the process, or a process cell?

What is the process where the noise spikes appear (arc furnace, blending, gas liquification . . . .)?

What are the types of field instruments from which you see spikes? What's being measured? What sensing technology is used ?

What kind of cable connects the field instrument to the DCS analog input? Stranded, twisted pair with shield?

Where are the shields grounded for the noise spike loops?

Is the instrument DC power supply output grounded ?

Is the DCS grounded?

What have you done to correct the situation, beyond asking permission to filter the signal flat?

Properly screen and terminate your cables to avoid induced voltage spikes causing interference on your transmitters.

It is probably just a bad transmitter power supply or perhaps a bad transmitter. Replace them all and see if the problem goes away. If it does, you've solved the problem.

Make sure to put all of the parts in the "Used But Good" box back in the shop so that when the problem comes back in the future, you can just go to the last thing taken out of the UBG box and pitch it in the closest dumpster!

Have FUN!
TT3

Dumpster?

"Recycle. The possibilities are endless".

Reuse IS more efficient than recycling but when the part is no longer suspect but a known bad actor, recycling is absolutely a possibility.

I just figured that at the point of figuring out the specific part that was actually causing the problem, which by this time has probably cost tens of thousands of dollars and perhaps days of lost or out of spec production, the operators, techs and their supervisors would be so frustrated that a resounding trip to "spike" the offending part into the trash bin would be therapeutic.

If an appropriately satisfying resounding "BOOM" is available at the bottom of the recycling bin, I would certainly have no objection.

Have FUN!
TT3