Hi,
The TCP0030A accuracy specs are as follows:
Accuracy, typical
DC: ±1% of reading
DC to 60 Hz, ≤5 A: ±1%
60 Hz – 5 kHz, ≤5 A: ±1.5%
DC – 5 kHz, >5 A: ±1.5%
The % of reading implies an accuracy within a percentage of the measured value. For example, a DC signal at 1A would have a +- 1% accuracy, meaning it would be accurate within 10mA. That implies a range of 990mA to 1010mA for the true signal value. A 1A signal at 1kHz would have 1.5% accuracy, implying a range from 985mA to 1015mA.