Appendix B
5B Series Module Data Sheets
SC-2311 User Manual
B-48
ni.com
Signal isolation by transformer coupling uses a proprietary modulation technique for linear,
stable and reliable performance. The differential input circuit on the field side is fully
floating, eliminating the need for any input grounding. A demodulator on the computer side
of the signal transformer recovers the original signal, which is then filtered and buffered to
provide a low-noise, low-impedance output signal. The output common must be kept within
±3 V of power common.
Convenience Features
A series output switch eliminates the need for external multiplexing in many applications.
The switch is turned on by an active-low enable input. The enable input should be grounded
to power common if the output need not be switched, as on the 5B01 and 5B08
backplanes
.
Figure 1. 5B47 Functional Block Diagram
Input Types
Thermocouple Types:
J, K, T, E, R, S, B
Output Ranges
0 to +5 V
(+1 V to +5 V - custom)
Figure 2. 5B47 Input Field Connections
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