Hi,
Find attached a schematic of your project.
The circuit biases the current transformer so with no current V1 has half Vcc or 1/2 of 5Vdc= 2.5V.
When AC is conducted through the transformer, the output will be an AC signal on the 2.5Vdc.
The library converts this reading to RMS.
With the coil disconnected your should have 0 Arms.
Tom....

As you may gather I have an aversion to fritzy diagrams, they are not schematics, and do not very clearly show how a circuit works.
(Sorry schematic shows A0 not A1)
I hope you aren't trying to measure DC Current, this unit only measures AC current.