DAQ 6020E(BNC) simple application

[poli]

I want to perform a simple application- obtain a user programmable output at the DAQ board 6020E(BNC) , say 5.5V. I programmed using MAX analog output channel number - DAC0 as analog output. I connected a BNC cable at the output DAC0. Is that the only wiring needed? Do i need to bother about  wiring anything to AOGND? I am following the diagram on page 4-21, fig 4-12 at the website, which has the manual

http://www.ece.ualberta.ca/~ee432/Handouts/6020Eusermanual.pdf

Also at appendix C  you can see a picture of front panel, where i dont see AOGND explicitly?

[Ima U]

Hi Poli,

If you are following figure 4-12 on page 4-21 then you are connecting your signal correctly.  As you can see from the figure, the load will be between the channel and the AOGnd.  The AOGnd, AIGnd and DGnd are all connected.  So you can connect your load between the DAC channels and pin 19, 20, 29 or 30 for ground.

I hope this helps,

[poli]

Thanks for your response. So i connect the positive of my load to DAC0 channel and negative to gnd pins say at 19. But BNC being a coaxial  connector,  at DAC0  two wires are  coming out, positive as well as negative, what should i do to the negative terminal coming out of DAC0 BNC connector? leave it floating or ground it at pin19 or 20.

[poli]

I left the other terminal from BNC connector floating and there was no problem. My next question is, - i see that a constant voltage as per the value programmed at analog output appears on the output terminals. Is there a way to start and stop it through software control? I am using NI-DAQ (legacy) software only.

[Ima U]

Hi Poli,

I believe what you are trying to do is similar to this Traditional NI-DAQ example program.  This is a shipping example that came with the Traditional DAQ driver called Acquire N- Multi Start.vi .  This will allow you to start and stop the vi using start and stop buttons. 

I hope this helps!

Message Edited by Ima U on 04-15-2008 02:58 PM