You can connect floating and grounded input signals to the FD-11634.

Make sure that devices you connect to the FieldDAQ device are compatible, as listed in the FD-11634 Specifications .

The FD-11634 provides an IEPE excitation current for each channel to measure the IEPE sensors. Typical IEPE sensors have a case that is electrically isolated from the IEPE electronics. As a result, connecting the sensor to the FD-11634 results in a floating connection even though the case of the sensor is grounded.

Floating Signal Sources

Figure 20. Connecting Floating Signal Sources to the FieldDAQ Device


Grounded Signal Sources

To ensure proper operation, make sure the voltage on the AI+ and AI- connections adhere to the channel-to-earth ground safety voltage specifications listed in the FD-11634 Specifications .

Figure 21. Connecting Grounded Signal Sources to the FieldDAQ Device