When measuring a small current, the clamp’s own offset can become a significant part of the displayed value. An apparent small draw needs a trustworthy measurement setup.

Interpreting the evidence

Follow the probe’s zeroing and operating instructions, check its suitability for the range and preserve the test conditions. Compare the reading before and after the event without moving the setup unnecessarily. A stable offset should be distinguished from a real change in vehicle current.

Keep this evidence

Include the clamp model, range, zeroing method and duration of the measurement.

Do not infer a parasitic-drain diagnosis from a small unexplained offset alone. Vehicle sleep conditions and measurement uncertainty also matter.

Speak to AXION

For complex vehicle-electronics diagnostics, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Suitable postal or remote work is confirmed before booking.

Technical background from Pico Technology. The referenced design explains the principle; the vehicle-specific procedure determines the repair.