I need to connect two microwave receivers to Labjack U3 to monitor their signal strength. Each receiver has a DC voltage with a positive and negative wire. Which is the best way to connect both receivers to the Labjack? Should I connect the positive wires from each to AIN0 and AIN01 respectively and the negative wires of each to the ground terminal located adjacent to the AIN terminals are will grounding both to the one terminal cause problems? I don't want to mess up my Labjack or the receivers.
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Yes, generally you connect all the Signal+ to analog inputs and connect all the Signal- to GND. All GND terminals are the same.
It is possible that these receivers could be designed such that this wiring is a problem, but in practice we never see that. Likely (and usually) the DC output of the receivers is isolated from each other and from AC mains, so shorting them together and shorting them to U3-GND is no problem.
https://labjack.com/support/app-notes/externally-powered-signals