Joulescope JS110 User’s Guide

Precision DC Energy Analyzer

Revision 2.0, last revised 2026 October 26.

• 1. Overview
  • 1.1. Affordable, easy-to-use, accurate and precise
  • 1.2. Key benefits
  • 1.3. Key features
  • 1.4. What comes in the box
• 2. Meet Your Joulescope
• 3. Quick start
• 4. Specifications
  • 4.1. Absolute maximum ratings
  • 4.2. Mechanical
  • 4.3. Recommended operating conditions
  • 4.4. Specification conditions
  • 4.5. Current measurement specifications
  • 4.6. Voltage measurement specifications
  • 4.7. General specifications
  • 4.8. Parasitic effects specifications
  • 4.9. Software-controlled fuse specifications
  • 4.10. General purpose inputs and outputs
• 5. Host software
  • 5.1. Installation
  • 5.2. Multimeter view
  • 5.3. Oscilloscope view
  • 5.4. Energy and Charge
  • 5.5. Open-source
• 6. Theory of operation
  • 6.1. Ammeter
  • 6.2. Voltmeter
  • 6.3. Host Computer
  • 6.4. Power, Energy, Charge, and Statistics
  • 6.5. High impedance / low leakage
  • 6.6. Electrical isolation
• 7. How to swap the front panel
• 8. GPI & GPO
• 9. Electrical Isolation
• 10. Typical Behavior
  • 10.1. Step Response
• 11. Compliance
  • 11.1. United States
  • 11.2. Europe
  • 11.3. Safety
  • 11.4. RoHS Directive 2011/65/EU, 2015/863/EU
  • 11.5. Country of origin
• 12. Maintenance
  • 12.1. Verification Procedure
• 13. Troubleshooting
  • 13.1. The Joulescope UI is not working as expected
  • 13.2. JS110 is not recognized by the host computer
  • 13.3. Offset error
  • 13.4. Unable to measure the full voltage range
  • 13.5. Unable to open in Joulescope UI
  • 13.6. Inaccurate measurements in the presence of strong RF
• 14. Warranty
• 15. Change log