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You must be a Control. A separate power supply may help solve this, meaning all instruments will take power from this power supply. All logos and trademarks are properties of their respective companies. Select the categories for which you would like to see messages displayed Use double quotes around phrases, as follows: I have never ever done that and have never had problems. Techncial Consultants matthewhyatt msn. Joe, this is likely NOT mznual answer to your problem Cable lengths from SLC analog module manhal the instrument may contribute to your noise problem.


This is difficult one especially not being there. Note that common words and, that, etc. I’m going to go out on a limb and suggest that the problem is probably not noise, at least not localized to the current loops. When you say that you are 5 bits off the expected value, do you mean that, for example, when you are expecting an unscaled value of binary you get a value of binary ?

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There could be a more systemic problem, for example, some unshielded device like a CRT very close to the rack. If we connect it in simulate using the loop PS we get the same 5-bit noise. Try putting an approriate resistor in the line, and put an oscilliscope across it to see what sort of ripple you get out of the transmitter.


InstraView Request Form To get started: The NI16 is a multi-class Class 1 or Class 3 single-slot module. Our calculations indicate we have planty of margin on PS. I am assuming that you are using mA loops. Username Password Remember me on this computer. The 5-bit noise is a problem.

The problem transmitter is a rosemount C 2-wire transmitter. Get a scope or a scope meter, you may even be able to locate the noise with a AC voltmeter set on low range.

A-B Analog Input Problem

We are seeing 5 bits of noise that we can’t explain. You may find the solution to be using a seperate power supply to power the analog loops. You state that if you use a simulator on an isolated power supply, that you get a much better signal, right? Do a very methodical, check of the system. Valid Email Required Item to Inspect: What else is using that power supply?