USB 6211 Analog Output Sharing AC/DC Ground

[Doug_Nordquist]

Hello. I have an application for the USB 6211 DAQ that uses one of the DAQ's Analog Output channels to supply 2-10 volts, which acts a a control signal for an actuator (the load). This actuator requires 24V AC for power, and 2-10V DC for a control signal, but is only a 3-terminal device. This means that The 24V AC power and the 2-10V DC control signal will be sharing a common/ground connection. More importantly, this means that the DAQ ground will be exposed to a 24V AC common from an AC supply. I've created a diagram of the circuit below:

My question is: will the DAQ suffer any harm from being exposed to AC ground/common in this manner?

Thanks in advance!

[Richard_Smith]

That shouldn’t be a problem; the problem would be if you’re load needs more current than the one the DAQ can give.