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We appreciate your patience as we improve our online experience.
01-14-2012 11:48 AM - edited 01-14-2012 11:51 AM
Hi ,
I have Problem with Flexrio. I get signal parts that do not exist normally. Here is a picture.
Thanks
02-05-2012 04:10 AM
Hi labview_jumper,
I'm assuming that you're use to cRIO or R series since the FPGA code you're showing (right?).
Actually, Analog FlexRIO adaptor Modules have their own clock, so you usually want you're AI node to be inside a SCTL running at the AI Clock rate.
Which module are you using? I'd suggest with give a try to the LabVIEW example associate to that module, that will give the architecture basis you should respect to use your FlexRIO.
Have a good day,
Flo
06-14-2012 09:21 AM
Hello ,
I am using NI 5752 with 7966R. I am also getting wierd signal shapes even when running their example programs. I can see that gain is varying at different frequencies even without any gain control implementation. What may be the reason for this? Any idea?
Thank you,
Mithun
06-14-2012 10:38 AM
Hello Mittu1,
I dont mind you post on that thread but you might get more answer creating a new one 😉
concerning your issue with the 5752, this make me think about an issue I have faced.
Can you tell us more about the signal you're sampling? The 5752 is design for ultrasound so there is a filter with a 16KHz cutoff frequency.
(see http://www.ni.com/pdf/manuals/375573a.pdf or http://www.ni.com/pdf/manuals/373035b.pdf).
So you cannot trust any result you're seeing about the gain if your signal frequency is lower 16KHz.
I hope this help.
Have a great day,
Flo
06-14-2012 12:05 PM
Hi Florent,
No i am working with ultrasound signals. If coming below 100 KhZ signal amplitude is very much high and at higher frequencies above 1 MhZ, it is coming down drastically. Really wierd behaviour. Can you suggest me any way to solve this?My signals are in the range of 200 khz to 6 MhZ. With very low amplitude..Say 10 mvpp.
Thank you,
Mithun
06-30-2012 10:11 AM
Hi Mittun,
did you try to use the 5781 example in which you can configure the ADC? Which anti-aliases filter do you use (7.5MHz, 10MHz or 14MHz)?
That can explain a lot about the amplitude variation you're seen 🙂
Flo
07-12-2012 09:33 PM
I tested NI 5752 with PXIe-7961R by using ConfigureDAC example.
Input signal is square wave of 500 KHz through SMB-2145.
Output is not square wave but half square half triangle wave.
I attach the photo of output wave.
I don't known how to solve this problem.
Do you know how to solve its? Please tell me if you know.