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G'day MrJack... 
It's more to do with how t/couples should be mounted and installed. Ideally, they should not be exposed to any kind of floating voltage that may occur as you can no doubt appreciate with the very small voltage levels being measured. Even though most inputs will have common mode induced voltage rejection circuitry employed, it may still be possible for a stray signal to interfere with the signal that you actually want.
Have you ensure that opportunities for possible ground loops have been identified and rectified? Is the t/c you're using a properly screened device? Where is the power currently sourced to power up the Controller? It is unusual for the kind of activity you describe to occur with a Controller that uses properly isolated inputs but, maybe the inputs are not so isolated.
If you're talking about powering up the Controller with a battery, how is this currently managed?
Mal.
It's more to do with how t/couples should be mounted and installed. Ideally, they should not be exposed to any kind of floating voltage that may occur as you can no doubt appreciate with the very small voltage levels being measured. Even though most inputs will have common mode induced voltage rejection circuitry employed, it may still be possible for a stray signal to interfere with the signal that you actually want.
Have you ensure that opportunities for possible ground loops have been identified and rectified? Is the t/c you're using a properly screened device? Where is the power currently sourced to power up the Controller? It is unusual for the kind of activity you describe to occur with a Controller that uses properly isolated inputs but, maybe the inputs are not so isolated.
If you're talking about powering up the Controller with a battery, how is this currently managed?
Mal.
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