Saraba-
When you drive a clock, that means that you are creating the square wave that is being sourced onto the line. With the PXI-5600, you can drive the PXI CLK_10 with the built-in oscillator or you can route an external signal to the backplane.
Locking and referencing usually apply to the same topic, which is Phase-Lock Looping (PLL). If you PLL to a clock source, that means that you are taking a freely running clock and making it in phase with a second clock(usually called the reference clock). This means the every time there is a rising edge on clock 1, there is a rising edge on clock2, i.e. in phase. That is the simple explanation for PLLing. With the PXI-5600, you are able to PLL to the PXI 10 MHz reference clock. By doing this, you are able to synchr
onize multiple devices by ensuring that all of the sample clocks are PLLed to the same reference clock, so that you are assured that they are sampling at the exact same time.
AndrewM
