I have an NI PXI chassis with an NI PXI-6608 in slot 2.
I am using LabWindows/CVI 6.0 to develop an application that uses the 6608.
I want to use the 6608's OCXO (highly stable oven controlled oscillator) for
all my C/T functions. However, I am not clear on some concepts with regards
to programming the 6608 via the DAQ C library...
When using the DAQ function GPCTR_Change_Parameter to change the ND_SOURCE
parameter, are the internal timebases phase locked with the OCXO 10MHz
clock? In other words, if I select either of the default internal timebases
(ND_INTERNAL_20MHZ of ND_INTERNAL_100_KHZ), will they exhibit the stability
of the 10MHz OCXO? Or must I set the ND_SOURCE parameter to RTSI_6 and use
10MHz as my source frequency i
n order to achieve the desired stability?
Also, how to I select the internal 80MHz source on the 6608? according to
the 6608 documentation, the 80MHz source is phase locked with the 10MHz
clock via the PXI backplane (when the 6608 is in slot 2), but I'm not sure
how to use it as a source. Does ND_INTERNAL_MAX_TIMEBASE select the 80MHz
source?
Thanks,
---
Bob
