I'm trying to plot a voltage signal (-0.40 mV ~ 7.60 mV) on LabView unfortunatelly I haven't achieved reading the signal with mV resolution, my conclusion is that the signal needs to be amplified.
Could anyone please tell me if amplifing the signal would help? If yes how can it be amplified?
I have an Analog Devices AD595 (Monolithic Thermocouple Amplifier)
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and I was wondering if it would help
Any help or hints would be kindly appreciated Best Regards
LabView is software, not hardware. From your title I guess you're using a National Instruments data acquisition card. They make quite a few models. Which one are you using?
But anyway, yes, amplifying it would probably help; alternatively, you need data acquisition hardware with appropriate resolution (for instance, a digital voltmeter with a mV scale and a computer output of some sort).
Accurately amplifying a DC signal that small is not trivial. Some things you'll need to specify are:
- what resolution do you need? E.g., 10uV, 1nV, ...?
- how much drift, over time and temperature, is acceptable? (Are you trying to measure over a timespan of milliseconds or days?)
- what speed do you need? E.g., is this a slowly-varying DC signal, or a
1MHz waveform, or ...?
- what is the output impedance of the signal source? (Alternately, what input impedance do you need from your amplifier?)
Are you measuring the output of a thermocouple? If not, then probably not.
But anyway, achieving fractional-mV resolution in a DC amplifier depends as much on good circuit design and layout skills as on the parts you use, and just having the right IC (even if it were, which it probably isn't) is not sufficient.
So, the simplest and best thing you could do would be to get a DAQ card with a thermocouple input, such as the NI USB-9211, which they list at $395, lead time
Here I must respectfully disagree with Spehro. The LM311 is just what you need. Put it in a box - ideally, you might want to solder it to a printed circuit board, and then mount the printed circuit board in a box, so that it doesn't rattle. Also put some audio connectors in the box, and wire the input connectors to the output connectors. Now, sell the box to an audiophile, for $395 plus tax and shipping. Use the proceeds to buy a thermocouple card to run LabView with.
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Not as much as reading the specifications- the 6024E can be programmed for FS of +/- 50mV with 0.008mV resolution and 0.106mV absolute accuracy using 100 point averaging.
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