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Thanks for all of your help.
—Ian, USA
LabJack
Measurement & Automation Simplified
The team at LabJack is driven to make measurement and automation simple and affordable. Located in Lakewood, Colorado, LabJack Corporation builds great hardware and software for industry, government, and education.
LabJack writes drivers for Windows, Linux, and Mac OS X, plus example code in dozens of languages.
Have a question or problem? LabJack engages in active customer support. You can find answers in the support area and FAQ, or contact us so we can help.
#1
I think Section 2.6.3.4 would be better for this topic, although to continue in detail about your particular signal I would start a forum topic or email support@labjack.com.
Start with all connections removed except for USB and your signal. Connect your signal to AIN0 and GND, monitor it in the test panel in LJControlPanel or in LJLogUD, and let us know what you see.
We can't provide a single calibration for the differential high-voltage channels on the U3-HV, because the calibration depends on the common-mode voltage on both inputs, so we leave it to the user to calibrate in their actual system. However, a differential measurement seldom makes sense with high-level signals. The differential app note has more information.