Lock in Amplifier on Single Board Rio 9636

Hey Guys,
I have to program a lock in amplifier for an analog signal i get from a microphone with a high SNR.
I have Labview 2012 SP1 and FPGA/RT 2012 and a SBRIO 9636.
I found an example: https://decibel.ni.com/content/docs/DOC-1762
LIA_IPnet_LabVIEW2009.zip
Now I am trying to understand the mostly uncommented code.
Question 1:
Can I use this program with my SBRIO? I prefer this to the SBRIO version on the same page because it is a dual phase LIA.
Question 2:
I added my own zip file were I added some comment boxes (orange background) but I commented in german. Maybe you can tell me if I am right so far. (Mainly in the HostLIA.vi and FPGA_LIA.vi)
Question 3:
Can someone help me to understand the subvi on the FPGA named "costa loop"? For example: What exactly is the code doing in the VCO subvi?
Question 4:
Can someone give me a link to a good document/website which explains the mathematic details of the decimation in a LIA?
(german or english)
If someone has another good working lock in program, please tell me.
Thanks for your help
Stefan
Attachments:
LIA_IPnet_LabVIEW2009.zip ‏3530 KB

Hello Slev1n,
here is some documentation about the Lock in Amplifier (mathematically):
http://www.thinksrs.com/downloads/PDFs/ApplicationNotes/AboutLIAs.pdf
in general it is possible to configure a cRIO project to a sbRIO project. You just need to configure a new target.
Regards, Elli

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The sbRIO-9626 and sbRIO-9636 has the ability to set the gain of the programmable gain instrumentation amplifier (PGIA) within the LabVIEW FPGA Block Diagram using the 'Voltage Range' Property Node.
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Each channel can be independently selected as the PGIA is downstream of the multiplixer as shown in Figure 22 of the Operating and Instructions Manual.
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Attached will be my modified VI for NI lock in amplifier start up kit.
Attachments:
lock in modern.llb ‏460 KB

Claudia,
thanks for the version mentioned.
I would like to change the lock-In to one with a reference signal
instaed of PLL, and a few other changes.
I tried to understand how your sample works , but as soon as I'm
reaching the VI's on a deeper level I'm running into code protection.
Why are these VIs not public?
Thanks
Urs
Claudia schrieb:
>Hello,
>
>Another person was also asking for a Lock-In Amplifier Start-Up kit
>that would not expire, and I published it in the following Discussion
>Forum:
>
>href="http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000...
>
>Hope this helps,
>
>Claudia Lorente
>Applications Engineer
>N
ational Instruments
>http://www.ni.com/ask
>
>

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