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Analog input voltage
Inmaculada
Member
12-20-2004 02:22 AM
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Hello,
I need to have as much precision as I can when acquiring an analog signal whose limits are 0 V (lower)and 2 V (upper). If I use MAX to configure my DAQ board it´s only possible to select 0-10 V and -5/+5 V. My DAQ board is MIO-16E (I also have AT-MIO-16F5, older one) and I am using LabVIEW 6.1.
Is it possible to select the upper limit I need in MAX? How could I get this?
Can anyone help me?
Thanks in advance,
Inma
I need to have as much precision as I can when acquiring an analog signal whose limits are 0 V (lower)and 2 V (upper). If I use MAX to configure my DAQ board it´s only possible to select 0-10 V and -5/+5 V. My DAQ board is MIO-16E (I also have AT-MIO-16F5, older one) and I am using LabVIEW 6.1.
Is it possible to select the upper limit I need in MAX? How could I get this?
Can anyone help me?
Thanks in advance,
Inma
Cristobal
NI Employee (retired)
12-21-2004 03:23 AM
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Hello,
From MAX, you can select the upper and lower limit on the Max and Min parameters when you create a virtual channel.
From LabVIEW, and using NI-DAQ Traditinal, you must set the Max and Min values in the input limits parameter of the AI Config.vi
Modifying this two parameters, you are setting the gain of the board and you are getting more bits of resolution on your measurement. So, you will have to set this two parameters to 2 and 0 values.
If you have a 0 - 2 volt signal, you can use a gain of 5 in order to adequate your signal to the dynamic range of the board ( 0 - 10 volts ). Doing that, you are obtaining more resollution on your measurement. The gain values depend on your board model. Consult the manual to know which are the possible gains.
Here, you have two interesting links:
http://digital.ni.com/public.nsf/websearch/CBA83550AB782D1C862566210061BEB9?OpenDocument
http://digital.ni.com/public.nsf/websearch/DD2B6FF2BFFF216C86256E23007A2532?OpenDocument
I hope this helps
From MAX, you can select the upper and lower limit on the Max and Min parameters when you create a virtual channel.
From LabVIEW, and using NI-DAQ Traditinal, you must set the Max and Min values in the input limits parameter of the AI Config.vi
Modifying this two parameters, you are setting the gain of the board and you are getting more bits of resolution on your measurement. So, you will have to set this two parameters to 2 and 0 values.
If you have a 0 - 2 volt signal, you can use a gain of 5 in order to adequate your signal to the dynamic range of the board ( 0 - 10 volts ). Doing that, you are obtaining more resollution on your measurement. The gain values depend on your board model. Consult the manual to know which are the possible gains.
Here, you have two interesting links:
http://digital.ni.com/public.nsf/websearch/CBA83550AB782D1C862566210061BEB9?OpenDocument
http://digital.ni.com/public.nsf/websearch/DD2B6FF2BFFF216C86256E23007A2532?OpenDocument
I hope this helps
