This document explains how to use the Fluke 8808A multimeter to accurately measure nano-amps of current, such as the leakage current of battery-powered devices. Traditional digital multimeters use a voltage divider to measure current, which introduces significant error. The Fluke 8808A multimeter uses an op-amp I-V conversion technique to achieve higher accuracy.
The note discusses the importance of measuring standby (leakage) current in battery‑powered devices, which can drain batteries even when the device is off. It explains that many electronic products exhibit micro‑amp or nano‑amp leakage that must be quantified during design and testing.
Fluke 8808A uses a current‑to‑voltage converter with very low input impedance, providing a resolution of 1 nA and an accuracy of 0.03 % over 200 nA and 2000 nA ranges. The document describes how to reduce measurement errors by using low‑value shunt resistors, proper shielding, cleaning contacts, and avoiding noise and contamination. This manual is written in Chinese.
| Accuracy | 0.03 % |
|---|---|
| Measurement ranges | 200 nA and 2000 nA |
| Input impedance | Very low |