Muxtronics USB type-C power meter

The Muxtronics USB type-C power meter is a fully characterized, very high precision, bidirectional, transparent USB type-C measurement tool. It has 5-digit measurement resolution and better than 1% accuracy over the full measurement range and temperature, at 2.5 updates per second. The tool is open source hardware, but due to code shared with a commercial project the firmware is not open. The tool passes through, unhindered, any high-speed signals and has a measurement range compliant with all USB type-C devices, up to 20V and 5A. Both ways.

The meter not only measures voltage and current, but also calculates power, accumulated charge (during on-time) and accumulated energy (during on-time). These values are non-persistent and reset upon repowering the device.

Technical specifications

USB type-C power meter Rev. 0
AttributeValueUnit
Min.Typ.Max.
Width50.0
1.97
mm (incl. connector)
in
Length28.0
1.10
mm
in
Height7.40
0.291
mm
in
Weight8.3
0.292
g
oz
Voltage range4.124.0V
Current range-5.0+5.0A
Accuracy (V)±1% + 20% + counts
Accuracy (I)±1% + 10% + counts
Precision (V)±0.8mV (2σ)
Precision (I)±0.6mA (2σ)
Self-consumption18.024.2mA
Maximum displayable
on-time
day:h:m:s
Maximum displayable
charge
500.00Ah
Maximum displayable
energy
5000.0Wh

Where to buy

The beta version - with no casing, no branded packaging and only limited field testing - can be bought for $20 at my Tindie store.