@crossrulz wrote:
tronoh wrote:
The signal is in differential mode (i.e two wires one + and other -). No GND being used in the connection scheme. So should I go for connections or not?
Are those signals referenced to ground somehow? Even in differential mode, each input should not go beyond the +-11V to ground.
You might want to give this white paper a read:Field Wiring and Noise Considerations for Analog Signals
At this point we have no way to judge if the signal you are attempting to connect will damage the system.
Let's use some examples and discuss the real use of that third or fourth wire on your primary power cord.
Assumtions: Something in your system is tied to a publically available power grid ( or, You may be on this planet "Earth", interplanataray travellers are refered to their respective species representatives for advisement)
there are exactly 2 options:
- the system you are testing and the system you are testing with share a common connection to "Earth Ground"
- One or more of those systems is isolated from "Earth Ground" by some manner that has a maximum breakdown potential
Attaching the two systems together will provide a common point of reference between the two of no greater than 20Volts before damage will occur to the DAQ device and potentially the computer housing it.
"Should be" isn't "Is" -Jay
