.. will be updated soon (in construction with a more accurate information)
If the ADC (or the data.acq device) have 100 kohm input impedance, how much accuracy would I lose?
Do I need to buffer this for a better accuracy?
I'm kind of confused to relate the accuracy g and the output voltage here. I would be glad if someone may explain it for a novice.
Setup will be as shown:
..will be updated
There is an interface box for connector input outputs and a dual power supply for the transducers. Number of transducers will be much more but for simplicity I drew two of them. The interface box and the data-acq. board can be very close to each other no prob.
But the transducers (floating wrt the earth) will be around 400 meter away from the box and daq as you see above. A CAT6 twisted shielded cable will be used for each transducer. In the diagram I named the letters for the transducers which corresponds their pins from the datasheet I linked.
The manufacturer states the output impedance as 1 kohm and says load can be 100 kohm. But isn't that a huge problem for accuracy?
I need an accuracy of 0.4 mV.
I'm kind of ignorant about how to interpret the datasheet to the accuracy and impedance of the transducer and ADC. Does this device need calibration or everything is already in datasheet? Is it possible to achieve around 0.4 mV accuracy?
*power ground and signal ground of the transducers (B and F) are internally connected I checked with a multi meter test.