I am quite new using PT-104 and I bought it thinking to use it not only as a teperature logger but also as a differential voltage logger.
I developed a Wheatstone Bridge (a quarter bridge) to use strain gauges, supplied by 12v batteries and then, I developed a VB application to ave strain readings. In pico PT-104, I use the differencial voltage connections with V- (pin2), V+ (pin3) and about pin 4, wich corresponds to the ground, I have some issues...
First, I connected pin 4 to the + connection of the bidge's output and the readings doesn't became stable. The same thing happens when I connect - connection of the bridge's output witn pin 4.
With this information I ask:
1. Am I using the right type of connection in PT-104? What is the difference by using single-ended connection type?
2. I'm not quite familiarized with ground function in PT-104, How can I connect GRND in this scheme?
Thanks a lot for yout help!