 Theoretically
speaking, it is correct to assume that when the input terminals are not
connected there is no output. This holds true for current-to-voltage transducers
but not always for voltage input units, as explained below.
Current-to-voltage transducers have a resistor connected at the socket;
rack-mounted transducers have them installed internally. When the input
terminals are disconnected, this resistor provides the necessary resistance
for a 0V output.
DC voltage input units all have high input impedance ratings. This means
that external noise can effect the unit to a point where output changes
notably, or even quite substantially. |
Why
does the output fluctuate even though the input signal terminals are not
connected?
