Table of Contents
Advertisement
Chapter 4
Analog Input
+
V
–
Method 2
NI 6238/6239 User Manual
AI +
AI –
AI GND
AI GND
Figure 4-2. Analog Current Input Connection Method 1
Method 2, shown in Figure 4-3, ties the AI – input to AI GND. When
measuring current up to 20 mA, this type of connection ensures that the
voltage level on both the positive and negative side are within the
common-mode input range for NI 6238/6239 devices.
AI +
AI –
AI GND
Figure 4-3. Analog Current Input Connection Method 2
+
–
+
–
4-4
Isolation
Barrier
Isolation
Barrier
ni.com
Advertisement
Table of Contents
