USB6120 as meter of thermocouple
Anyone know anyway I can set up a USB-6120 as a meter of thermocouple in place measure voltage? I have a few extra analog inputs on the device I want to use for this purpose, so I don't have to buy a whole new data acquisition. Anyone have any ideas? Is this possible?
I guess you meant USB-6210... Everything depends on the desired degree of precision... You will meet 2 limiting factors:
-noise DAQ of entry card: M-series cards usually have pretty good performance, without signal conditioning, you can already reach noise measurements less than 1 ° C, with the more sentitive input range (we did this on a project for a client). But to be very careful in your wiring, sampling frequency (higher), with an average of signal, etc. To get better, you will definitely need additional electronic (preamplifier and a lowpass filter anti-aliasing with cut up to half of your actual sampling frequency). You will find screws to convert the voltage measured temperature in the digital palette (Scaling).
-compensation of welding cold temperature: thermocouple, thus not only measure the temperature at their "end of remote sensing" (the junction of the thermocouple), but are also influenced by the junction of the thermocouple wires (made of some specific materials according to type of transport CANADA) with the connection of the side block DAQ board of copper. To compensate for the parasitic portion of the signal, you need to measure the temperature of the block connector (for example with an RTD, so you do really need one more Ain chanel) and fix the total voltage for the thermocouple voltage provided at this temperature. All this is done automatically when you use OR packaging, specially designed for the connection of thermocouple signals. But if you have a "precise reasonnably guess" (regarding your needs of precision) of your connector block temperature, the conversion V T screws allow you to specify its value. To first order (that is, if one ignores the linearity no thermocouple), the overall error will equal the error in your estimate of the temperature to the connection block. Not really suitable for precise (1 ° or less) the measures, but OK if you measure an oven at high temperature +/-10 ° C...
I hope this helps.
Vincent
Tags: NI Software
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