Help setting up USB 6009 for experiment

Hi,
I am a new LabVIEW user. I have purchased a USB 6009 and I need it to acquire data from a pair of electrodes and a differential pressure sensor. Below is a schematic of how I think everything should be hooked up. I just have some questions regarding the setup before I run my experiment.
I will be using the electrodes to measure voltage drop. However, I am wondering whether I need a ground reference connected to the bottom GND pin. This is because I will be operating the electrodes in the +/- 20 V range and according to the user guide, each pin has a maximum voltage of +/- 10 V with respect to GND. I assume this means that if the +ve electrode measures +15 V wrt to GND and the -ve electrode measures -5 V wrt to GND, the DAQ will provide a reading of 15 V instead of 20 V. So if I need a ground reference, what do I connect to the bottom GND pin?
During this experiment, I will also be collecting data from an Omega PX26-030DV differential pressure sensor, which has a maximum voltage output of 100 mV. It will be powered by a Circuit Specialists CSI3005T power supply at 10 VDC. I believe I have made the right connections, but do I also need to connect the terminal 4 GND on the DAQ to the power supply GND?

You definitely need grounds! The internal circuitry of the DAQ device is referenced to the DAQ Ground. Since the device is USB connected, the DAQ ground is also the computer ground. All grounds should be connected together, ideally on only one place to avoid ground loops.
1. On the 10 VDC power supply shown in your diagram what is the relationship of + and - to ground? The ideal situation for a strain gauge pressure transducer is +5 V and - 5 V because that reduces the nominal common mode voltage to zero. Regardless, there needs to be a reference connection between the power supply and AI GND.
2. What is the circuit (or equivalent circuit) to which the electrodes are connected? That also needs a reference connection to AI GND.
3. What is the source impedance of the electrode circuit? The USB-6009 has a relatively low input impedance (144000 ohms) and it is terminated to a non-zero voltage. I do not have the manual readily available but I think I recall the equivalent voltage is about 1.4 V. Both of these can cause significant problems for some measurements with "floating" electrodes.
4. The +/-10 V limit with respect to ground is absolute. You cannot have +15 V to ground on one electrode and - 5 V to ground on the other electrode and expect it to work. The only way a 20 V differential rangs is possible is with one signal at +10 V and the other at -10 V. A 15 V signal will not be measured accurately and could result in damage to the DAQ device.
Give us all the information about your system so we can provide appropriate answers. You may need some external signal conditioning for parts of your system.
Lynn

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