Alice, I think vendor service engineers often blame power fluctuation in a wholesale fashion for any unexplanable instrument problems (that's my experience, anyway). I would say that the only reason to get a line conditioner would be where power actually fluctuates, something that your plant engineer can test for (or, at least arrange to be tested for). In most cases, insuring that the instrument has a dedicated circuit with a clean ground to the ground buss at the circuit origin is adaquate. MAK.
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