Changes

Shown below, a XO1.5 is measuring the DC charging current of a XO1.0. The voltage is measured across a 0.8 ohm series resistor. The phono plug of one laptop has an inbuilt 680 ohm series resistor to protect against excessive voltage, the power plug of the other laptop has an inbuilt series diode to protect against reverse voltage. This circuit cannot be used for one laptop to monitor itself because the grounds must be at 2 different points.

Shown below, a XO1.5 is measuring the DC charging current of a XO1.0. The voltage is measured across a 0.8 ohm series resistor. The phono plug of one laptop has an inbuilt 680 ohm series resistor to protect against excessive voltage, the power plug of the other laptop has an inbuilt series diode to protect against reverse voltage. This circuit cannot be used for one laptop to monitor itself because the grounds must be at 2 different points.

[[File:Schematicdccurrent.jpg]]

[[File:Schematicdccurrent.jpg]]

The laptop was charged from a fully discharged state while turned off. The voltage delivered to the laptop was only (11.46 -0.7)V because of losses across the current measuring resistor and the protection diode. The plot has a scale of 0.5V/square /0.8 ohms = 6.25 amps/square and 1200 seconds/square or 20 minutes per square. The full charge took 156 minutes at 7.75 amps.

 

The laptop was charged from a fully discharged state while turned off. The voltage delivered to the laptop was only (11.46 -0.7)V because of losses across the current measuring resistor and the protection diode. The plot has a scale of 0.5V/square /0.8 ohms = 6.25 amps/square and 1200 seconds/square or 20 minutes per square. The full charge took 156 minutes at 7.75 amps. The minimum voltage the XO1.5 can measure is 0.17V corresponding to 0.21 amps.

 

[[File:Charge current.jpg]]

[[File:Charge current.jpg]]