Muralidharan wrote:
How does changing a DAQ board
from a 0-10 volt range to a -10 to 10 volt range, affect the minimum
voltage change that can be detected?
A.The minimum voltage
change that can be detected will be split in half.
B. There will
be no effect on the minimum voltage change that can be detected.
C.
The minimum voltage change that can be detected will be doubled.
D.
The minimum voltage change that can be detected will depend inversely
with the resolution of the board.
C:
Assuming
they are talking about an Analog Input task (For an analog output the
answer lies in the external test equipment).
Every AI channel goes
first through a gain/filter stage the signal out of the gain stage will
vary from the ADC's negitive rail to its positive rail. Therefore to
change from a 10 swing to a 20 volt swing the gain must be halved and
each bit step size (referanced to input) is doubled
"Should be" isn't "Is" -Jay
