Joulescope JS320-K001 Energy Analyzer, Factory Calibration And ISO, 15V, 3A, 200kHz, JS320 Series

Joulescope JS320-K001 Energy Analyzer w/ Factory Calibration & ISO

The Joulescope JS320 is the third‑generation precision energy measurement instrument designed for engineers developing modern, low‑power electronics. Building on the JS110 and JS220, the JS320 features an advanced autoranging shunt ammeter with an exceptional dynamic range making it ideal for profiling devices that transition between nanoamp sleep states and amp‑level active modes. With improved accuracy, especially at lower maximum currents, the JS320 delivers industry‑leading visibility into current, voltage, power, energy, and charge consumption.

Key Benefits

• Unmatched Dynamic Range - Accurately measures current from amps down to nanoamps, enabling precise profiling of devices with extreme low‑power modes and high‑current bursts.
• Ultra‑Low Voltage Drop - With only 25 mV drop at 1 A, the JS320 minimizes burden voltage and ensures your device under test receives stable, accurate supply voltage, even during rapid current changes.
• High‑Speed Visibility Into Short Events - Sampling at 2 million samples per second with 200 kHz bandwidth, the JS320 reveals power consumption details that traditional meters miss, including: Inrush currents, Interrupt service routines and Short‑duration tasks and events.
• Intuitive and Easy to Use - Real‑time reporting of current, voltage, power, energy and charge. Its multimeter and oscilloscope views make it simple to understand both instantaneous behavior and long‑term trends.
• Customizable and Open Source - Fully open‑source host software on GitHub and swappable front panels (also open source) for different connector types.
• Portable and Desk‑Friendly - Compact enough for any workspace and easy to carry, making precision energy measurement accessible anywhere.
• Affordable for Every Engineer - Priced so that every developer can have a Joulescope at their desk—enabling continuous energy optimization and eliminating late‑stage power consumption surprises.

Specifications

• ±15V voltage range
• ±3A current range, continuous (10A pulses)
• 0.1 nA resolution, equivalent to 36-bits of dynamic range
• 200 kHz bandwidth with 1 million samples per second, 24-bit, simultaneous current and voltage
• Rapid 1 μs switching between shunt resistors for seamless dynamic current measurement
• Enwavify technology for consistent, accurate measurements through current range changes
• Computes power, energy, and charge
• Sensor ports electrically isolated from USB
• Works with Microsoft Windows, Apple macOS, and Linux
• 4 general-purpose inputs and 2 general-purpose outputs
• 1 BNC trigger configurable for either digital input, digital output, or analog output
• JS320 is fully compatible with JS220 front panels and accessories
• JS320-K001 also includes ISO 17025:2017 calibration

Precision DC Energy Analyzer for Low‑Power and IoT Devices

The Joulescope JS320 is a high‑accuracy DC energy analyzer for measuring current and voltage while computing real‑time power and energy usage. It is engineered for battery‑powered devices, IoT hardware, and embedded systems that exhibit extreme dynamic current ranges.

Modern electronics often draw nanoamps (nA) or microamps (µA) during sleep and milliamps (mA) or amps (A) during active operation. The JS320 solves this measurement challenge with:

• High‑speed sampling
• Fast dynamic current range switching
• Seamless, continuous current measurement across 10 orders of magnitude

This enables engineers to accurately capture short‑duration events such as inrush currents, interrupt service routines, and rapid state transitions.

JS320 Provides Two Essential Views

• Multimeter View – Instantaneous voltage, current, power, energy
• Oscilloscope View – High‑resolution waveforms for analyzing transient behavior

Fully Open Source and Developer‑Friendly Platform

• joulescope_driver – Core driver, Python bindings, and CLI utilities
• pyjoulescope – Adapter supporting the original Joulescope API for custom automation and scripting
• pyjoulescope_ui – The graphical user interface used by most engineers for visualization and analysis

Applications

• Microprocessor and microcontroller power profiling
• Hardware power optimization and validation
• Sleep‑mode current measurement for IoT and embedded devices
• Hardware and firmware troubleshooting
• Software characterization and ISR profiling
• USB inrush and suspend current pre‑compliance testing
• General‑purpose current, voltage, power, charge, and energy measurement

What's in the Box

• JS320-K001 instrument with installed binding post front panel
• 5' USB C to A cable
• USB A to C adapter
• 25 cm GPIO cable
• Allen wrench (for swapping the front panel)
• Quick start guide
• Factory calibration and ISO 17025:2017 calibration
• Sticker
• Carrying case

FAQ - Questions and Answers

1. How does the JS320 improve low‑current accuracy compared to earlier models?
   The JS320 improves low‑current accuracy by redesigning the entire measurement path to reduce noise, drift, and offset error at nanoamp levels. It uses a more stable analog front end, tighter thermal control, and a higher‑resolution 24‑bit ADC, all of which help it maintain consistent readings during long, low‑current measurements.
2. What is Enwavify v2 and how does it affect measurement accuracy?
   Enwavify v2 directly improves measurement accuracy during fast current changes. In the JS320, Enwavify v2 eliminates the JS220’s fallback to the 10 A range and instead blends ranges smoothly using new hardware support. This reduces transition‑related error and produces cleaner measurements for devices that jump quickly between sleep and active states.
3. What’s new in the JS320 compared to the JS220?
   The JS320’s upgrades over the JS220 are mostly about cleaner, more stable measurements. It adds a redesigned analog front end with much better offset stability, a 24‑bit ADC for lower noise, and a linear‑phase signal path that preserves fast current transitions. It also supports Enwavify v2. Altogether, these changes make the JS320 noticeably more accurate and predictable for low‑power energy analysis.