Where are you measuring the Voltage at 5.2V ? Try measuring it between TP1 and TP2 on the RPi Board and post the reading here. I suspect that you have excessive voltage drop either in your MicroUSB Cable or the F3 Polyfuse or both. I did take this reading between TP1 and TP2... I also tried differe...

I have got the latest Raspberry Pi (Debian GNU/ Linux Wheezy) and my keyboard frustratingly won't work. After reading some articles I have checked the power output and it is at a perfect level (5.2V) and the keyboard I use is in the list of compatible USB keyboards (Dell SK - 8115 100mA). I'm stuck ...