Can trigger signal be a reference for PLL (Phase Lock Loop) in Lock-In?

[ds2dys]

Hi.

I have a PCI-5122 (NI-SCOPE)  and a PCI-5401 (NI-FGEN) installed in a computer.

I want to measure 2 signals from the sample which is excited by a modulated laser whose modulation signal is provided by the FGEN. FGEN produce a sinusoidal waveform to drive a laser diode controller and trigger the SCOPE at the same time.

I got a LockInDemo library from NI and found the PLL (Phase lock loop) module uses one of 2 channels of the SCOPE as a reference. What a waste!

So my questions is:

Is there any way to use a trigger signal, which SCOPE receives externally, as a reference for the PLL?

Any comments will be appreciated.

Ray

[Matt_A]

Hello Ray,

I'm not sure I understand your question. You mentioned that you are using the LockInDemo library, which I assume is this package. Is this correct? If so, you will note on the page I linked that the only hardware supported by this application is the NI 4472 for PCI and PXI. However, I am a little unclear on your overall application.

It sounds like you are trying to synchronize your PCI-5122 with the PCI-5401. Are you trying to synchronize your generation and acquisition clocks to ensure that samples are read at the same time that they are generated? Or, are you trying to synchronize your acquisition on the PCI-5122 with the signal generated by the PCI-5401? This may be a little bit more difficult because the PCI-5122 uses digital TTL signals for triggering and clocking, but it sounds like the signal generated by your PCI-5401 is a sinusoid. If you could provide some more information about what, exactly, you are trying to accomplish then we may be able to recommend a solution for you.