# Joulescope JS110 Datasheet The Joulescope™ JS110 is a precision DC energy analyzer. It measures current and voltage, then computes power and energy. It combines high-speed sampling and rapid dynamic current range switching to provide accurate and seamless current and energy measurements, even for devices with rapidly varying current consumption. - -1V to 15V voltage range - -1A to 3A current range, continuous - Up to 10A current pulses (<10 ms, < 3A average per second) - Down to 1.5 nA resolution, equivalent to 32-bits of dynamic range - Synchronously measures voltage and current at 2 million samples per second, 14-bit - 250 kHz bandwidth - Rapid 1 µs switching between shunt resistors for seamless dynamic current measurement - Computes power, total energy, and charge - Operates with minimal voltage disturbance between IN and OUT ports - Up to ±48V common-mode voltage between USB ground and IN-, IN+, OUT+, and OUT- - 2 general-purpose inputs and 2 general-purpose outputs - Programmable on/off for power cycling the target device and measuring inrush currents - USB 2.0 high-speed host connectivity - Host software support for Microsoft® Windows®, Apple® Mac® OS X®, and Linux® - Host software provides real-time graphs of current, voltage, and power over time - Host software is open source and available on GitHub - Swappable front panel with open-source designs on GitHub - Firmware upgradable The [Joulescope JS110 User’s Guide](https://docs.joulescope.com/en/products/js110/guide/index.md) describes how to use the instrument. The specification values are also available as [js110_datasheet.yaml](https://docs.joulescope.com/en/products/js110/js110_datasheet.yaml). ## Absolute maximum ratings | | Min | Max | Unit | |---------------------------------------------------|--------|-----------|--------| | USB voltage | -0.3 | 6 | V | | Max voltage applied between IN+ to IN- | -20 | 20 | V | | Max voltage applied between OUT+ to OUT- | -20 | 20 | V | | Max voltage to USB ground (IN+, IN-, OUT+, OUT-) | -48 | 48 | V | | Input current (powered, burst) | -10 | 10 | A | | Input current (powered, sustained) | -3 | 3 | A | | Input current (unpowered) | -0.5 | 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 | | Typical | Unit | |--------------------------------------------|-----------|--------| | Weight | 217 | grams | | Width | 81 | mm | | Length (including banana jack front panel) | 150 | mm | | Height | 33 | 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 to IN | | -1 | | 15 | V | | Input current | continuous | -1.5 | | 3 | A | | Input current pulse | < 10 milliseconds, < 3A average | | | 10₁ | A | | Input current pulse | < 100 milliseconds, < 3A average | | | 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 Joulescope is designed not to need recalibration. ## Current measurement specifications | Range | Accuracy | Resolution | Impedance | Bandwidth | |------------------|----------------|--------------|-------------|-------------| | 10 A₁ | ±0.3% ±7 mA | 1 mA | 0.01 Ω | 250 kHz | | 2 A | ±0.3% ±1.50 mA | 175 µA | 0.01 Ω | 250 kHz | | 180 mA | ±0.3% ±150 µA | 15 µA | 0.11 Ω | 250 kHz | | 18 mA | ±0.25% ±15 µA | 1.5 µA | 1.11 Ω | 250 kHz | | 1.8 mA | ±0.25% ±1.5 µA | 150 nA | 11.1 Ω | 180 kHz | | 180 µA | ±0.25% ±150 nA | 15 nA | 111 Ω | 70 kHz | | 18 µA | ±0.25% ±30 nA | 1.5 nA | 1111 Ω | 15 kHz | 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. ## Voltage measurement specifications | Range | Accuracy | Resolution | Impedance | Bandwidth | |---------|---------------|--------------|-------------|-------------| | 15 V | ±0.1% ±11 mV | 1.2 mV | - | 250 kHz | | 5 V | ±0.1% ±3.5 mV | 400 µV | - | 250 kHz | ## General specifications | | Test condition | Min | Typical | Max | Unit | |------------------------|------------------|-------|-----------|-------|--------| | Sampling frequency | 25 °C | | 2000000 | | sps | | Sampling frequency | 25 °C | -20 | | 20 | ppm | | Front panel insertions | | | | 100 | | ## Parasitic effects specifications | | Test condition | Min | Typical | Max | Unit | |------------------------------|--------------------------------|-------|-----------|-------|--------| | Current leakage (IN+ to IN-) | 25 °C, +3.3V | | 2 | | nA | | Current leakage (IN+ to IN-) | 25 °C, +5V | | 2 | | nA | | Current leakage (IN+ to IN-) | 25 °C, +15V | | 3 | | nA | | Shunt resistor voltage, max | 0 to 2 A, static | | 20 | 21 | mV | | Burden voltage (IN+ to OUT+) | < 1 A, banana jacks | 0 | 25 | 30 | mV | | Burden voltage (OUT- to IN-) | < 1 A, banana jacks | 0 | 3 | 8 | mV | | Shunt switching time | Over-range, < 100 ns rise time | 0 | 0.8 | 1.2 | µs | | Over-range settling time | | 0 | 2 | 5 | µs | | Under-range settling time | | 0 | 2 | 5 | µs | ## Software-controlled fuse specifications | | Test condition | Min | Typical | Max | Unit | |-------------------------------|------------------|-------|-----------|-------|--------| | Current leakage (IN+ to OUT+) | 25 °C, 3.3V | | 5 | | nA | | Current leakage (IN+ to OUT+) | 25 °C, 5V | | 7 | | nA | | Current leakage (IN+ to OUT+) | 25 °C, 15V | | 28 | 5000 | nA | ## General purpose inputs and outputs | | Test condition | Min | Typical | Max | Unit | |----------------------------------|-----------------------|------------|-----------|------------|--------| | Programmable logic level voltage | | 1.8 | | VUSB - 0.2 | V | | Input leakage per pin | 25 °C | | | ±1 | µA | | Input leakage per pin | | | | ±2 | µA | | Output voltage high | -100 µA | Vcco - 0.1 | | | V | | Output voltage high | -4 mA @ 1.65 V | 1.2 | | | V | | Output voltage high | -8 mA @ 2.3 V | 1.9 | | | V | | Output voltage high | -24 mA @ 3 V | 2.4 | | | V | | Output voltage high | -32 mA @ 4.5 V | 3.8 | | | V | | Output voltage low | 100 µA | | | 0.1 | V | | Output voltage low | 4 mA @ 1.65 V | | | 0.45 | V | | Output voltage low | 8 mA @ 2.3 V | | | 0.3 | V | | Output voltage low | 24 mA @ 3 V | | | 0.55 | V | | Output voltage low | 32 mA @ 4.5 V | | | 0.55 | V | | Output impedance | 10 mA | 90 | 100 | 110 | 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 [Vishay VEMI45AA-HNH](https://www.vishay.com/docs/81385/vemi45aa.pdf), which is an EMI filter with ESD protection. The VEMI45AA is a pi filter with 100 Ohm resistance and capacitance between 29 pF and 60 pF. ### GPIO supply | | Min | Typical | Max | Unit | |------------------|-------|------------|-------|--------| | +5V output | 4.4 | VBUS - 0.1 | 5.5 | V | | Current | | | 100 | mA | | Output impedance | | 1 | | Ω |