NI Home > Community > NI Discussion Forums

Multifunction DAQ

Reply
Member
9019745346
Posts: 27
0 Kudos

I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

Hello

I am using  two sensor with  different types , one is one sample on demand & other is continuous sample on demand .
If I have use the PCI6713 DAQ Card I am able to generate two different types signals independently . If I have use the PCI6723 DAQ Card I am not able to generate the two different type of signal independently .Is there any difference between PCI6713 & PCI6723 DAQ Card

 

Regards

Sanjeev Ganapati Naik

Active Participant
P@Anand
Posts: 1,690
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

Can you be bit more specific ?. what is the signal you are generating? Analog Output?. If yes you cannot use different configuration at the same instant because the card is using single DAC (I guess).

-----

I don't believe in Hard work. I love my work :smileyhappy:
Member
9019745346
Posts: 27
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

I am generating frequency  in A0 & DC signal  in A1

Active Participant
P@Anand
Posts: 1,690
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

No I don't think that will work. Both are entirely different configuration the card can support one configuration in a task and you cannot have different task for the same output type in the same card.

-----

I don't believe in Hard work. I love my work :smileyhappy:
Member
9019745346
Posts: 27
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

If i want to generate frequency and dc voltage simultaneously I need two different 6723 card

Active Participant
P@Anand
Posts: 1,690
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

Yes otherwise you can search for cards which has individual DAC for each channel ( But am not sure how good that will work for your requirement ).

-----

I don't believe in Hard work. I love my work :smileyhappy:
Member
9019745346
Posts: 27
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

Thank you

Knight of NI
Dennis_Knutson
Posts: 32,038
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

[ Edited ]

You CAN generate both an AC and DC signal to the different analog outputs. The only thing is that you have to use a single task. If you have a waveform for the ac signal, also use a waveform for the dc. Just have all of the Y values the same. Pretty basic actually.

 

However, your original post says you have two different sensors and that would imply that you need to read two separate signals - not generate anything.

Active Participant
Kevin_Price
Posts: 1,916
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

I can't speak to the 6723 board in particular, but I'm pretty sure that many boards with AO would allow you to have exactly one hardware-timed AO task simultaneous with one or more software-timed AO tasks. 

 

This can come in handy if there's a need in your app to occasionally change the DC offset value.  It's just easier to deal with than if it were a 2nd channel of a continuous-generation task.  However if you *don't* need to change the DC channel value, just do it like Dennis K said.  You may have to anyway if the 6723 doesn't the support the mode I've been talking about.

 

-Kevin P

Knight of NI
Dennis_Knutson
Posts: 32,038
0 Kudos

Re: I am not able to generate the two different type of signal independently using PCI6723 DAQ Card

Thanks Kevin,

 

I forgot about that option. You're right that it can be very handy