Revision 1.3 Joulescope JS220 User’s Guide Page 3 / 51
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2. Key benefits
• Dynamic range: The Joulescope JS220 accurately measures electrical current over ten orders of
magnitude from amps down to nanoamps. This wide range allows accurate and precise current
measurements for modern devices. Sleep modes are often just nanoamps (nA) or microamps
(µA). Active modes are often milliamps (mA) or amps (A).
• Low voltage drop: Most multimeters and current meters have a significant voltage drop
(sometimes called burden voltage or insertion loss), which affects 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.
• Makes the invisible visible: The JS220 measures current and voltage 2 million times per second
with 300 kHz bandwidth. This high sampling rate makes the power consumption of interrupt
service routines, inrush currents, and other short events visible.
• Easy to use: The JS220 reports cumulative energy and charge 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!
• Customizable: The 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.
• Portable: The JS220 fits in your backpack and only needs a small part of your desk. It provides
precision measurements in a portable, unintrusive form factor.
• Affordable: The Joulescope JS220 is affordable and priced so that every developer on the team
can have one at their desk. With such convenient access, Joulescopes allow 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!
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