# Specifications This section only gives the specification changes relative to the [Joulescope JS220 User’s Guide](https://docs.joulescope.com/en/products/js220/guide/index.md). All other specifications remain the same as the JS220. The [JS220+ datasheet](https://docs.joulescope.com/en/products/js220plus/datasheet.md#datasheet-js220plus) lists the complete specifications. ## Current measurement specifications This table replaces the JS220 [current measurement specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md#js220-current-measurement-specifications). | Range | Accuracy | Resolution | Impedance | Guaranteed | |--------------------------|-------------------------|--------------|-------------|--------------| | 10 A (> 2 A)₁ | ±0.25% ±1.5 mA | 350 µA | 0.01 Ω | ±9.7 A | | 10 A (≤ 2 A) | ±0.1% ±300 µA | 75 µA | 0.01 Ω | ±2.05 A | | 180 mA | ±0.1% ±30 µA | 6.5 µA | 0.11 Ω | ±185 mA | | 18 mA | ±0.1% ±3.0 µA | 650 nA | 1.11 Ω | ±18.5 mA | | 1.8 mA | ±0.1% ±300 nA | 65 nA | 11.1 Ω | ±1.85 mA | | 180 µA | ±0.1% ±30 nA | 6.5 nA | 111 Ω | ±185 µA | | 18 µA | ±0.1% ±3 nA₂ | 0.65 nA | 1111 Ω | ±18.5 µA | 1. Max 3 A sustained. See the recommended operating conditions for higher current durations. 2. ±1.0 nA for ±5 °C over 24 hours with trim offset calibration. ## Voltage measurement specifications This table replaces the JS220 [voltage measurement specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md#js220-voltage-measurement-specifications). | Range | Accuracy | Resolution | Guaranteed | |---------|---------------|--------------|--------------| | 15 V | ±0.1% ±1 mV | 500 µV | ±14.5 V | | 2 V | ±0.1% ±150 µV | 75 µV | ±2.2 V | ## Parasitic effects specifications This table replaces the JS220 [parasitic effects specifications](https://docs.joulescope.com/en/products/js220/guide/specifications.md#js220-parasitic-effects-specifications). | | Test condition | Min | Typical | Max | Unit | |--------------------------------------------------|--------------------------------|-------|-----------|-------|--------| | Current leakage (Voltage + to -) | 25 °C, ±3.3V | | | 200 | pA | | Current leakage (Voltage + to -) | 25 °C, ±5V | | | 200 | pA | | Current leakage (Voltage + to -) | 25 °C, ±14V | | | 300 | pA | | 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 | 1.0 | 1.5 | µs | | Measurement gap following a current range switch | | | | 0 | µs | | Input bias current Voltage+ & - | 25 °C | | ±5 | ±20 | pA | | Input bias current, Current + & - | 25 °C, 18 µA current range | | ±60 | ±600 | pA | Resolution is given for 10 kHz measurement bandwidth (20 ksps). The JS220+ includes a safety banana jack front panel rather than binding posts.