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Joulescope instrument

Joulescope: Precision DC Energy Analyzer

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Joulescope's precision and fast sample rate enabled me to discover unexpected processing, and I reduced my device's energy consumption by removing this unnecessary processing.  Joulescope is now a valuable part of my toolset for debugging and verifying designs.

Frank Hunleth, VP Hardware Engineering, SmartRent Inc.

Joulescope helped me get my firmware to much lower power states faster.  Having the Joulescope’s multimeter and oscilloscope view open while developing low-power firmware is now an essential part of my workflow.

Alvaro Prieto, Firmware/Hardware Engineer

While developing a library to conserve power in embedded devices, I needed a tool to prove its effectiveness. Joulescope was all I needed to easily and accurately record device power consumption and performance. It is now an indispensable part of my embedded projects.

Chris Freeze, Software Engineer, DockYard Inc
  • Joulescope connects to your computer

  • View the instantaneous current, voltage, power and energy

  • Like a multimeter
  • And view changes over time

  • Like an oscilloscope

Joulescope connects to your computer

View the instantaneous current, voltage, power and energy

Like a multimeter

And view changes over time

Like an oscilloscope

Key Features

Amazing dynamic range

Joulescope accurately measures electrical current over 9 orders of magnitude from amps down to nanoamps. This wide range allows accurate and precise current measurement for modern devices. Sleep modes are often just nanoamps (nA) or microamps (µA). Active modes are often milliamps (mA) or amps (A).

Easy to use

Joulescope reports cumulative energy consumption along with real-time current, voltage, and power. The multimeter view clearly shows the most recent value while the oscilloscope view allows you to explore changes over time. Much simpler and more accurate than anything in its class!

Low voltage drop

Most multimeters and current meters have a significant voltage drop (sometimes called burden voltage or insertion loss) which effects the actual voltage delivered to the device under test. Joulescope has a total voltage drop of 25 mV at 1 A, which keeps your target device running correctly. Joulescope's extremely fast current range switching maintains low voltage drop even under rapidly varying current demands.

Joulescope instrument


The Joulescope host software is open source on GitHub. You can also swap the banana jack front panel with front panels that have other connector types! The front panels are open source on GitHub.

Makes the invisible visible

Joulescope measures current and voltage 2 million times per second with 250 kHz bandwidth. This high sampling rate makes the power consumption of interrupt service routines, inrush currents and other short events visible.


Joulescope is affordable and priced so that every developer on the team can have one at their desk. With such convenient access, Joulescope allows developers to see the impact of their changes on energy consumption immediately. Developers can make informed choices to account for battery life during design. Eliminate power consumption surprises during final product testing!