# Joulescope JS220 User’s Guide  **Precision DC Energy Analyzer** Revision 2.0, last revised 2026 Oct 26.  * [Overview](https://docs.joulescope.com/en/products/js220/guide/overview.md) * [Affordable, easy-to-use, accurate and precise](https://docs.joulescope.com/en/products/js220/guide/overview.md#affordable-easy-to-use-accurate-and-precise) * [Key benefits](https://docs.joulescope.com/en/products/js220/guide/overview.md#key-benefits) * [Key features](https://docs.joulescope.com/en/products/js220/guide/overview.md#key-features) * [Meet Your Joulescope JS220](https://docs.joulescope.com/en/products/js220/guide/meet.md) * [Quick start](https://docs.joulescope.com/en/products/js220/guide/quick_start.md) * [Specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md) * [Absolute maximum ratings](https://docs.joulescope.com/en/products/js220/guide/specifications.md#absolute-maximum-ratings) * [Mechanical](https://docs.joulescope.com/en/products/js220/guide/specifications.md#mechanical) * [Recommended operating conditions](https://docs.joulescope.com/en/products/js220/guide/specifications.md#recommended-operating-conditions) * [Specification conditions](https://docs.joulescope.com/en/products/js220/guide/specifications.md#specification-conditions) * [Current measurement specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md#current-measurement-specifications) * [Voltage measurement specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md#voltage-measurement-specifications) * [General specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md#general-specifications) * [Parasitic effects specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md#parasitic-effects-specifications) * [Software-controlled fuse specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md#software-controlled-fuse-specifications) * [General purpose inputs and outputs](https://docs.joulescope.com/en/products/js220/guide/specifications.md#general-purpose-inputs-and-outputs) * [Host software](https://docs.joulescope.com/en/products/js220/guide/host_software.md) * [Joulescope User Interface](https://docs.joulescope.com/en/products/js220/guide/host_software.md#joulescope-user-interface) * [Scripts and automation](https://docs.joulescope.com/en/products/js220/guide/host_software.md#scripts-and-automation) * [How to Connect Your Joulescope](https://docs.joulescope.com/en/products/js220/guide/connect.md) * [Measure only current (ammeter)](https://docs.joulescope.com/en/products/js220/guide/connect.md#measure-only-current-ammeter) * [Measure only voltage (voltmeter)](https://docs.joulescope.com/en/products/js220/guide/connect.md#measure-only-voltage-voltmeter) * [Measure power supply provided](https://docs.joulescope.com/en/products/js220/guide/connect.md#measure-power-supply-provided) * [Measure target device consumption](https://docs.joulescope.com/en/products/js220/guide/connect.md#measure-target-device-consumption) * [Measure subsystem consumption](https://docs.joulescope.com/en/products/js220/guide/connect.md#measure-subsystem-consumption) * [Measure higher voltages](https://docs.joulescope.com/en/products/js220/guide/connect.md#measure-higher-voltages) * [Theory of operation](https://docs.joulescope.com/en/products/js220/guide/theory.md) * [Ammeter](https://docs.joulescope.com/en/products/js220/guide/theory.md#ammeter) * [Voltmeter](https://docs.joulescope.com/en/products/js220/guide/theory.md#voltmeter) * [Host Computer](https://docs.joulescope.com/en/products/js220/guide/theory.md#host-computer) * [Power, Energy, Charge, and Statistics](https://docs.joulescope.com/en/products/js220/guide/theory.md#power-energy-charge-and-statistics) * [High impedance / low leakage](https://docs.joulescope.com/en/products/js220/guide/theory.md#high-impedance-low-leakage) * [Electrical isolation](https://docs.joulescope.com/en/products/js220/guide/theory.md#electrical-isolation) * [How to swap the front panel](https://docs.joulescope.com/en/products/js220/guide/front_panel.md) * [GPI & GPO](https://docs.joulescope.com/en/products/js220/guide/gpio.md) * [Fuse](https://docs.joulescope.com/en/products/js220/guide/fuse.md) * [Max Fuse](https://docs.joulescope.com/en/products/js220/guide/fuse.md#max-fuse) * [Range Fuse](https://docs.joulescope.com/en/products/js220/guide/fuse.md#range-fuse) * [User Fuses](https://docs.joulescope.com/en/products/js220/guide/fuse.md#user-fuses) * [Electrical Isolation](https://docs.joulescope.com/en/products/js220/guide/isolation.md) * [Filters and Frequency Response](https://docs.joulescope.com/en/products/js220/guide/filters.md) * [Analog Filter](https://docs.joulescope.com/en/products/js220/guide/filters.md#analog-filter) * [Downsample by 2](https://docs.joulescope.com/en/products/js220/guide/filters.md#downsample-by-2) * [Downsampling](https://docs.joulescope.com/en/products/js220/guide/filters.md#downsampling) * [Typical Behavior](https://docs.joulescope.com/en/products/js220/guide/typical_behavior.md) * [Step Response](https://docs.joulescope.com/en/products/js220/guide/typical_behavior.md#step-response) * [Maintenance](https://docs.joulescope.com/en/products/js220/guide/maintenance.md) * [Verification Procedure](https://docs.joulescope.com/en/products/js220/guide/maintenance.md#verification-procedure) * [Offset Calibration](https://docs.joulescope.com/en/products/js220/guide/maintenance.md#offset-calibration) * [Compliance](https://docs.joulescope.com/en/products/js220/guide/compliance.md) * [United States](https://docs.joulescope.com/en/products/js220/guide/compliance.md#united-states) * [Canada](https://docs.joulescope.com/en/products/js220/guide/compliance.md#canada) * [Europe](https://docs.joulescope.com/en/products/js220/guide/compliance.md#europe) * [Safety](https://docs.joulescope.com/en/products/js220/guide/compliance.md#safety) * [RoHS Directive 2011/65/EU, 2015/863/EU](https://docs.joulescope.com/en/products/js220/guide/compliance.md#rohs-directive-2011-65-eu-2015-863-eu) * [Country of origin](https://docs.joulescope.com/en/products/js220/guide/compliance.md#country-of-origin) * [Warranty](https://docs.joulescope.com/en/products/js220/guide/warranty.md) * [Intellectual Property](https://docs.joulescope.com/en/products/js220/guide/intellectual_property.md) * [Change log](https://docs.joulescope.com/en/products/js220/guide/changelog.md)