# Joulescope JS220+ Datasheet
The Joulescope™ JS220+ is a limited-edition, performance-enhanced version of
the Joulescope JS220. The JS220+ achieves ±1 nanoamp accuracy with
exceptional temperature stability, all while providing the same best-in-class
high-dynamic current range measurement as the standard JS220.
The [Joulescope JS220+ User’s Guide](https://docs.joulescope.com/en/products/js220plus/guide/index.md) describes the
JS220+ improvements, and 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
[js220plus_datasheet.yaml](https://docs.joulescope.com/en/products/js220plus/js220plus_datasheet.yaml),
which holds the differences from
[js220_datasheet.yaml](https://docs.joulescope.com/en/products/js220/js220_datasheet.yaml).
The JS220+ specifications are the same as the JS220, except for the current
measurement, voltage measurement and parasitic effects specifications.
Resolution is given for 10 kHz measurement bandwidth (20 ksps). The JS220+
includes a safety banana jack front panel rather than binding posts.
## 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 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.
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% ±1 mV | 500 µV | ±14.5 V |
| 2 V | ±0.1% ±150 µV | 75 µV | ±2.2 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 | | | 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 |
## 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.