# Joulescope JS220+ User’s Guide  **Precision Energy Analyzer with Enhanced Accuracy** Revision 2.0, last revised 2026 Oct 26.  * [Introduction](https://docs.joulescope.com/en/products/js220plus/guide/introduction.md) * [Specifications](https://docs.joulescope.com/en/products/js220plus/guide/specifications.md) * [Current measurement specifications](https://docs.joulescope.com/en/products/js220plus/guide/specifications.md#current-measurement-specifications) * [Voltage measurement specifications](https://docs.joulescope.com/en/products/js220plus/guide/specifications.md#voltage-measurement-specifications) * [Parasitic effects specifications](https://docs.joulescope.com/en/products/js220plus/guide/specifications.md#parasitic-effects-specifications) * [Trim Calibration](https://docs.joulescope.com/en/products/js220plus/guide/trim_calibration.md) * [Technology](https://docs.joulescope.com/en/products/js220plus/guide/technology.md) * [Ordering Information](https://docs.joulescope.com/en/products/js220plus/guide/ordering.md) * [Change log](https://docs.joulescope.com/en/products/js220plus/guide/changelog.md)