analog mode multiplxer

[9900118714]

Hi
 when i am going through NI 6013 manual i found in Block digram analog input muxes,and analog Mode Multiplexer with Voltage reference     i want to know how it is going to work in selection of input, what is the significance of using Voltage Reference ?
 
 
 
 

[tnek]

Hi 9900118714, The analog mode multiplexer is where the analog input mode (differential, referenced single ended, non-referenced single ended) takes effect. The multiplexer will either pass both input channels to the amp if it is differential mode or it will take the referenced single ended channel along with the ground reference and pass that pair into the amp. The voltage reference circuit provides this ground reference. You can find more information about the different analog input modes in <a href="http://zone.ni.com/devzone/cda/tut/p/id/3344" target="_blank">this</a> article. Regards,KentApplications Engineer

[9900118714]

Hi
still i am not getting use of Vref&nbsp;in &nbsp;Analog Mode Multiplier.
&nbsp;
i have gone through the link you have mentioned in that he explained in generally view and not mentioned anything about Vref.
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What&nbsp;&nbsp;i understood from manual is PCI 6013 card is having two 8 X 1 mux ,output &nbsp;of each is given to Analog mode multiplier.i want to know Analog mode multiplier is a mux if so which type i.e 8 X 1 mux or 16X1 mux, how it is using Vref to generate the output which are connected to Amplifier.
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I need detailed explaination for this.

[tnek]

Hi 9900118714,I was wondering if you could clarify what you are trying to do or what you are trying to measure. The Vref is the voltage reference circuit what is internal to the card. This voltage reference is getting this voltage from a power rail on the PCI bus. This is just one input in the analog mode multiplexer (mux) which will relay the correct signals depending on the analog input mode to the amplifier. This is mainly used in calibration but you can access these internal terminals in test panels as seen in the screenshot below.<img src="Loading Image..."> For more about these internal channels, see <a href="http://digital.ni.com/public.nsf/allkb/5826DD1B3709DBCA86256E2B00805C3D?OpenDocument" target="_blank">this</a> article. Regards,KentApplications Engineer<img src="file:///C:/DOCUME%7E1/klau/LOCALS%7E1/Temp/moz-screenshot.jpg" alt=""> Message Edited by tnek on 04-11-2008 12:59 PM


TestPanel.png:
http://forums.ni.com/attachments/ni/70/8653/1/TestPanel.png

[9900118714]

Hi,
thanku for replying.
&nbsp;
In PCI 6013 NI used PGIA is it NI built ASIC chip for 6013 card or normal PGIA available in market ?
and NI using 5 DAC at the analog inputside for calibration i want to know how these DAC are used for calibration ?
&nbsp;
&nbsp;

[Dennis Knutson]

Your questions are getting progressively more bizarre. Are you trying to design your own DAQ board?