Chapter 2
Using Your NI 4472
NI 4472 User Manual
2-6
ni.com
Before configuring the analog input channels and making signal
connections, you need to determine:
•
Whether the input signal source is floating or grounded
•
Whether the accelerometer or microphone you are using requires
ICP-type current stimulation
•
Whether AC or DC coupling is best for your application
•
The voltage range of the input signal
Signal Sources
The analog input channels of the NI 4472 have unbalanced differential
inputs. Figure 2-2 shows the input configurations for floating and grounded
signal sources.
Figure 2-2.
Input Configurations for the NI 4472
Caution
Connecting a signal that varies more than ±2.5 V from the ground reference of
the NI 4472 to the ground (shield) of any analog input channel can result in inaccurate
measurements or damage to your device. National Instruments is
not
responsible for
damage caused by such connections.
Floating
Source
NI 4472
NI 4472
Grounded
Source
Signal
Ground
Signal
Ground
+
–
+
–
+
–
+
–
CH
n
CH
n
