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From: J_Thomas on 5 May 2008 16:10
Hi Elake, Here are a few documents you might want to look at to help solve the noise issue:<a href="http://digital.ni.com/public.nsf/allkb/5D9D06457CB4DD9786256B0B00568EDC?OpenDocument" target="_blank">Filtering Out 60 Hz Noise When Using the SCC-SG04 and other SCC Strain Gauge Modules</a> Thought about nulling resistors?<a href="http://digital.ni.com/public.nsf/allkb/D58D0C7EA466DC0786256F05006E77DE?OpenDocument" target="_blank">Offset Nulling with the SCC-SG24</a> <a href="http://digital.ni.com/public.nsf/allkb/4F00A0167643CC2F86256F39004EDD06?OpenDocument" target="_blank">Why Am I Getting Noisy Measurements with My SC-2345 Signal Conditioning Modules?</a> <a href="http://zone.ni.com/devzone/conceptd.nsf/webmain/01F147E156A1BE15862568650057DF15#6" target="_blank">Field Wiring and Noise Considerations for Analog Signals</a> You asked in your first post about measurement setup and scaling. One common way of setting up this type of measurement is to use a NI-DAQmx Custom Voltage with Excitation Task.&nbsp; You can then set up a custom scale to convert the voltage reading to a PSI reading.If after reviewing the above documents, you still can?t figure out what is going on, I have a few questions for you:- I am a bit confused about the noise you are seeing in your measurement. In your first post you mentioned that your signal fluctuates from -10m to 60m and you can read 2.40V (but still hunting all over) when the shunt cal is active on the Transducer. In you second post you mentioned ?Just checked the output with a Fluke 789, reading is .002V @ 0psi, simulated 80% (shunt cal) = .026V. I haven't installed any of the transducers yet.? Do you have the transducer installed yet? What signal are you trying to measure? Is it possible that the signal itself is noisy?
- Could you provide a detailed description or diagram of how you have your signal connections? What slot is the SCC-SG24 installed? How do you have your wires connected?
- What are you using to take your measurements?&nbsp; A test panel in Measurement &amp; Automation Explorer (MAX) for your device or task? A LabVIEW program?
- What settings do you have configured in software?
- Have you tried Lynn?s suggestion to try testing your setup on a known voltage with your transducer disconnected?
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