10-22-2013 01:48 PM
Hi I have a pressure transducer that I need to have 2 seperate devices read from continuousely. This is a 0-10V analog output signal. One system will be sampling at around 10Hz the other will sample around 1-10kHz. Both are differential analog inputs.
Will there be issues if I do this?
Will I get inaccurate measurements?
Do the voltage measurement devices affect each others measurements?
Thanks. An explaination either way would be much appreciated.
10-22-2013 03:38 PM
10-23-2013 09:49 AM
This signal is going to two seperate devices so sampling once then pulling out every 100th sample would not work but I understand. So do you see any advantage or disadvantage to converting to 4-20mA and then measure across a precision resistor, besides the obvious of extra hardware and added labor? Thanks.
10-23-2013 11:42 AM
10-23-2013 11:47 AM
Depending on your hardware and application it could have both advantages and disadvantages. In general, adding more equipment can compound error (such as the error in the precision resistor and/or power supplies). However, for very long wire lengths current can be advantagous.
Some good ref. info on how to decide what is appropriate:
Also whether you have current measurment modules is an important consideration (vs. using a precision resistor).
10-25-2013 03:48 PM
The reason I need to use 2 devices is I need the signal for a PID loop in a VFD (Device #1) and then I am using a PXI (Device #2) to record the pressure at 1kHz.