 Change from Fieldpoint to CompactDAQ AI gives strange values |
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 Jun 27 2008, 02:44 PM
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Very Active  Member Posts: 121 Joined: 31-July 06 From: Stockholm Member No.: 5713 Using LabVIEW Since:1996 LV:8.5 ,7.1.1 ,8.0.1 
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Dear all
We got a strange problem when moving from a Fieldpoint with a FP-AI-110 to CompactDaq rack with a 9203 (and also a AO, DO, DI module to in additon to the 9203, we used a 6009 before), there is one pressure sensor 4-20mA and one temperature sensor 4-20mA. Before the change the readings were normal now they have very high noise overlaid, resulting in a pressure from -2 to 3 bar when unpressurized. We have tried about 10 different ideas to eliminate the problem but with no success yet. Any ideasor suggestions are highly appreciated ! Best regards Anders This post has been edited by Anders Björk: Jun 27 2008, 02:48 PM
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Jun 27 2008, 02:44 PM
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Jul 2 2008, 04:53 PM
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 Extremely Active Member Posts: 509 Joined: 2-August 05 Member No.: 2680 Using LabVIEW Since:1996 LV:8.5.1 ,8.6 ,. 
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Never used those modules before, but have you tried grounding any unused channels?
Also, are you getting 4ma when the pressure is 0? I've never had a pressure sensor give exactly 0 output when the input is 0 pressure. You might want to scale the values before presenting the output. Neville.
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