# Joulescope JS220 Datasheet The Joulescope™ JS220 is a precision DC energy analyzer. It measures current and voltage, then computes power and energy. It measures current over ten orders of magnitude, from amps down to nanoamps, with rapid current range switching and low voltage drop. - ±15V voltage range - ±3A current range, continuous - ±10A current pulses (<10 ms, < 3A average per second) - Down to 0.5 nA resolution, equivalent to 34-bits of dynamic range - Synchronously measures voltage and current at 2 million samples per second, 16-bit - 300 kHz bandwidth - Rapid 1 µs switching between shunt resistors - Enwavify™ technology for consistent, accurate measurements through current range changes - Computes power, energy, and charge - Operates with minimal voltage disturbance between Current + and Current – ports - Up to ±48V common-mode voltage between USB ground and sensing ports - 4 general-purpose inputs and 2 general-purpose outputs - 1 BNC trigger configurable for either input or output - Programmable on/off for power cycling the target device and measuring inrush currents - USB 2.0 high-speed host connectivity with modern USB C connector - Host software support for Microsoft® Windows®, Apple® macOS®, and Linux® - Host software user interface provides real-time graphs of current, voltage, and power over time - Python library and scripting provided - Host software is open source and available on GitHub - Swappable front panel with open-source designs on GitHub - Firmware upgradable The [Joulescope JS220 User’s Guide](https://docs.joulescope.com/en/products/js220/guide/index.md) describes how to use the instrument. The specification values are also available as [js220_datasheet.yaml](https://docs.joulescope.com/en/products/js220/js220_datasheet.yaml). ## Absolute maximum ratings | | Min | Max | Unit | |--------------------------------------------------------------------------------------|-----------|-----------|--------| | USB voltage | -0.3 | 6 | V | | Max voltage applied between any port (Current +, Current -, Voltage +, Voltage -) | -20 | 20 | V | | Max voltage to USB ground from any port (Current +, Current -, Voltage +, Voltage -) | -48 | 48 | V | | Input current (powered, burst) | -10 | 10 | A | | Input current (powered, sustained) | -3 | 3 | A | | Input current (unpowered) | N/A (off) | N/A (off) | A | | Storage temperature | -40 | 80 | °C | | Operating temperature | 0 | 50 | °C | | Relative humidity (non-condensing) | 0 | 95 | % | | Altitude from sea level | -100 | 2500 | m | | Max voltage applied to GPI relative to USB ground | -10 | 10 | V | ## Mechanical ### Instrument only | | Typical | Unit | |----------------------------------------------------|-----------|--------| | Weight | 190 | grams | | Width | 99 | mm | | Length (including binding posts and BNC connector) | 126 | mm | | Height | 28 | mm | ### Complete product kit | | Typical | Unit | |--------|-----------|--------| | Weight | 510 | grams | | Width | 190 | mm | | Length | 200 | mm | | Height | 60 | mm | ## Recommended operating conditions | | Test condition | Min | Typical | Max | Unit | |------------------------------------------------|----------------------------------|-----------------|-----------|----------------|--------| | Operating temperature | | 10 | | 40 | °C | | USB supply voltage | | 4.5 | 5 | 5.5 | V | | USB supply current | | | | 500 | mA | | Voltage applied across Voltage + and Voltage - | | -14.5 | | 14.5 | V | | Voltage applied across Current + and Current - | Current range off | -15 | | 15 | V | | Input current | continuous | -3 | | 3 | A | | Input current pulse | < 50 milliseconds, < 3A average | -10₁ | | 10₁ | A | | Input current pulse | < 250 milliseconds, < 3A average | -5₁ | | 5₁ | A | 1. Suitable for handling inrush currents when connecting capacitive loads. ## Specification conditions | Temperature | 23 °C ± 10 °C | |----------------------|-------------------------------| | Humidity | 20% to 80% RH, non-condensing | | Calibration interval | 1 year₁ | 1. Recommended to comply with industry-standard practices, but the Joulescope JS220 is designed not to need recalibration. ## Current measurement specifications | Range | Accuracy | Resolution | Impedance | Guaranteed | |------------------|-----------------|--------------|-------------|--------------| | 10 A₁ | ±0.25% ±1.50 mA | 175 µA | 0.01 Ω | ±9.7 A | | 180 mA | ±0.25% ±150 µA | 15 µA | 0.11 Ω | ±185 mA | | 18 mA | ±0.25% ±15 µA | 1.5 µA | 1.11 Ω | ±18.5 mA | | 1.8 mA | ±0.25% ±1.5 µA | 150 nA | 11.1 Ω | ±1.85 mA | | 180 µA | ±0.25% ±150 nA | 15 nA | 111 Ω | ±185 µA | | 18 µA | ±0.25% ±30 nA | 1.5 nA | 1111 Ω | ±18.5 µA | 1. Joulescope is designed for 3 A sustained. See the recommended operating conditions for maximum durations for higher currents. Test current measurement bandwidth by varying the effective load impedance. Due to load capacitance, altering the source voltage is not a valid method of testing current bandwidth. The JS220 is sensitive to RF radiation which induces real current in test setups. When tested with EN61326-1 and 3 V RMS/m, the JS220 measured up to 10 µA (observed, not guaranteed) of current at several frequencies. The exact frequency susceptibility varies with cable length and configuration. ## Voltage measurement specifications | Range | Accuracy | Resolution | Guaranteed | |---------|--------------|--------------|---------------------| | 15 V | ±0.1% ±10 mV | 1.2 mV | ±14.5 V₁ | | 2 V | ±0.1% ±2 mV | 180 µV | ±1.98 V | 1. Beta units are limited to ±13.6 V. The JS220 is sensitive to RF radiation which induces real voltages in test setups. When tested with EN61326-1 and 3 V RMS/m, the JS220 error increased by 10 mV (observed, not guaranteed) at several frequencies. The exact frequency susceptibility varies with cable length and configuration. ## General specifications | | Test condition | Min | Typical | Max | Unit | |------------------------|------------------|-------|-----------|-------|--------| | Sampling frequency | 25 °C | | 2000000 | | sps | | Sampling frequency | 25 °C | -25 | | 25 | ppm | | Measurement bandwidth | -3 dB | 280 | 310 | 350 | kHz | | Front panel insertions | | | | 100 | | ## Parasitic effects specifications | | Test condition | Min | Typical | Max | Unit | |--------------------------------------------------|--------------------------------|-------|-----------|-------|--------| | Current leakage (Voltage + to -) | 25 °C, ±3.3V | | 2 | | nA | | Current leakage (Voltage + to -) | 25 °C, ±5V | | 2 | | nA | | Current leakage (Voltage + to -) | 25 °C, ±15V | | 3 | | nA | | Shunt resistor voltage, max | -2 to 2 A, static | | 20 | 21 | mV | | Burden voltage (Current + to -) | 1 A, banana jacks | 0 | 25 | 35 | mV | | Burden voltage (Current + to -) | Shunt resistor, < ±2 A | | | ±20 | mV | | Shunt switching time | Over-range, < 200 ns rise time | 0 | 0.8 | 1.2 | µs | | Measurement gap following a current range switch | | | | 0 | µs | ## Software-controlled fuse specifications | | Test condition | Min | Typical | Max | Unit | |----------------------------------|------------------|-------|-----------|-------|--------| | Current leakage (Current + to -) | 25 °C, 3.3V | | ±5 | | nA | | Current leakage (Current + to -) | 25 °C, 5V | | ±7 | | nA | | Current leakage (Current + to -) | 25 °C, 15V | | ±28 | ±5000 | nA | | Max fuse engage | 5 A | | 0.293 | | s | | Max fuse engage | 10 A | | 0.050 | | s | ## General purpose inputs and outputs | | Test condition | Min | Typical | Max | Unit | |---------------------------|-----------------------|------------|-----------|------------|--------| | Internal 3.3V reference | | 3.135 | 3.3 | 3.465 | V | | External reference | Vref < (VUSB - 0.5 V) | Vref - 0.1 | Vref | Vref + 0.1 | V | | Input leakage per pin | 25 °C | | | ±10 | nA | | Input leakage per pin | | | | ±100 | nA | | Output voltage high | -100 µA | Vcco - 0.1 | | | V | | Output impedance | 10 mA | 45 | 50 | 80 | Ω | | GPI sample rate | | | 2 | | MSPS | | Continuous output current | Per pin | | | ±50 | mA | | Total power dissipation | Over output impedance | | | 0.25 | W | The Joulescope uses the TI SN74LVC2T45 for both the GPIs and GPOs. See the [SN74LVC2T45 datasheet](http://www.ti.com/lit/gpn/sn74lvc2t45) for more information. Both the GPIs and GPOs are protected with the TI TPD4E1U06 for ESD protection.