© National Instruments
|
2-5
If any of these conditions are exceeded, the input voltage is clamped until the fault condition is
removed. Measurements performed while the input is clamped will return a constant, noiseless
voltage reading that corresponds to the exact positive or negative full scale voltage.
Figure 2-5.
Signal Connections when using TB-4310 (600V)
Refer to the
PXIe-4310 and TB-4310 (10V)/TB-4310 (600V) Getting Started Guide and Terminal
Block Specifications
for details about signal terminal locations.
Input Ranges
The input range is the maximum differential voltage, the difference between AI+ and AI-, that
can be measured. Selecting an input range sets the gain of the PGIA. You can individually
program the input range of each AI channel on your PXIe-4310 module.
The input range affects the resolution of the PXIe-4310 module for an AI channel. Resolution
refers to the voltage of one ADC code. For example, a 16-bit ADC converts analog inputs into
one of 65,536 (= 2
16
) codes—that is, one of 65,536 possible digital values. These values are
spread fairly evenly across the input range. So, for an input range of -10 V to 10 V, the voltage
of each code of a 16-bit ADC is:
I
s
ol
a
ted Gro
u
nd
Ch
ass
i
s
Gro
u
nd
+
–
AI+
AI–
COM
PXIe-4
3
10 Mod
u
le
+
–
V
S
IG
+
–
V
I
S
O
+
–
V
CM
+
V
S
IG
–
60
TB-4
3
10 (600V)
10 V (–10 V)
–
2
16
------------------------------------
305
μ
V
=
