If you are getting unexpected or unusual measurements from your Voltage Probe, first check that the red and black leads are properly and securely attached, according to the experimental setup. If you suspect that the readings are not correct, make sure you have zeroed the probe correctly. To do this, connect the red and black clips together. Zero the probe in the software. The reading should go to zero. If it does not, the wires may be damaged.
For additional troubleshooting tips and FAQs, see www.vernier.com/til/1425