Input Signal Connection Example - National Instruments NI 6521 User Manual

Input Signal Connection Example

Figure 6 and Figure 7 show signal connections for a supply connected to an
isolated input. The power supply can be any DC voltage within the
NI 6520/6521 device range. Refer to the device specifications for
information about voltage ranges.
0 V~ +30 V
or
0 V~ –30 V
0 V~ +30 V
or Signal
0 V~ –30 V
Up to 120 V
Common
Common-Mode
Mode
Voltage
NI 6520/6521 User Guide
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P0.X + 2.43 kΩ
P0.X –
AC Input
Photocoupler
Figure 6. NI 6520 Input Signal Connection Example
P0.X +
2.43 kΩ
P0.X –
Figure 7. NI 6521 Input Signal Connection Example
14
+3.3 V
+3.3 V
AC Input
Photocoupler
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