This answer was originally posted on DCIM Support by Steven Marchetti on 2017-06-26
I'm not sure there is a single answer for this. If you're simply pulling info from a device, we should be able to have that data as accurate as SNMP will allow. If you're taking info from multiple sensors and creating a virtual sensor, it should also be based on the info obtained from the device. If you're editing DDFs however, we'd probably need to know more about the precise implementation. If for instance you're changing watts to KW and expect to be able to add up 5 watts here and 10 there, I don't think that would add well into a KW virtual sensor nor do I think it was designed with that in mind. I suggest working with the DDF team for things like that.
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