Magnetic sensor to the top of analog frequency AC for Turbine flow meter measurement

Hello!!

I use the following hardware configuration to measure a flow meter flow turbine.

Material: 1000 SCXI Chassis

SCXI 1102 voltage input module

SCXI-1303 terminal connection block

Flowmeter: output signal is the frequency of the alternating current (30mv peak-to-peak). Sensor is a magnetic sensor type.

I tried to convert the signal of output voltage in the area of frequency using the FFT, but I get the wrong data.

I wonder if anyone can suggest good troubleshooting techniques so that I can understand what is mess up my position or my technique of measurement in labview itself will not completely? (From my understanding I think that I can measure the frequency of the ac voltage signal generated by the sensor of the FFT. By measuring the frequency I can calculate the water flow)

I am aware that a potential cause might be the ground loop in the system. The signal is based solely on the SCXI-1102 with factory default bias and pullup resistior network. I see no other reason reading wrong or fault in my measurment. Also the flowmter is brand new and there is no risk of damage to the sensor.

I'm sorry if I'm missing out on any important detail to answer that I am relatively new on the techniques of data acquisition.

Thank you

Concerning

Aditya

It's conditioning of signals... and that's what you want to do, so it's not so far

And if your signal about 30mV Ridge to Ridge, it fits perfectly in the beach of crete to 200mV Ridge...  I wouldn't say no need of amplification... the + 100mV is not a minimum of signal, this is the maximum signal in this range

Hang it up, take a measurement in single channel mode with one all 10kSPS sample rate take 100ms (1000points) and feed in single tone detection...

display with a graph of signal, stop the vi, in the rigth diagram, click the graph icon and create a constant, save that in a vi and post here if you need help in signal processing

Tags: NI Hardware

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