4. Specifications#

4.1. 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

4.2. Mechanical#

	Typical	Unit
Weight	217	grams
Width	81	mm
Length (including banana jack front panel)	150	mm
Height	33	mm

4.3. Recommended operating conditions#

	Test condition	Min	Typical	Max	Unit
Operating temperature		10		40	°C
USB supply voltage		4.5	5.0	5.5	V
USB supply current				500	mA
Voltage applied to IN		-1.0		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

Suitable for handling inrush currents when connecting capacitive loads.

4.4. Specification conditions#

Temperature	23 °C ± 10 °C
Humidity	20% to 80% RH, non-condensing
Calibration interval	1 year¹

Recommended to comply with industry-standard practices, but Joulescope is designed not to need recalibration.

4.5. 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

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.

4.6. 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

4.7. 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

4.8. 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

4.9. Software-controlled fuse specifications#

	Test condition	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

4.10. 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 for more information. Both the GPIs and GPOs are protected with the Vishay VEMI45AA-HNH, 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.

4.10.1. GPIO supply#

	Min	Typical	Max	Unit
+5V output	4.4	VBUS - 0.1	5.5	V
Current			100	mA
Output impedance		1		Ω