Both of my plugable hubs ‘USB2-HUB7BC’ are acting weird. First, they only deliver 4.88 Volts output, even if there is no load whatsoever. An original Apple 12W adapter delivers 5.12 Volts. The 4.88 Volts are enough to trigger an undervolt warning on a Raspberry Pi.
Second, a ‘smart’ measurement device (YZXStudio USB 3.0 Power Monitor) detects all ports as regular 0.5 amp USB devices (D+ and D- being at 0 Volts). The same original Apple 12W charger is detected as ‘Apple 2.4A’. D+ and D- showing 2.77 Volts.
Are both devices broken, or is my measurement device off?