3-Wire I-V analyzer not working with PNP transistor

[StarSword-C]

Using an ELVIS II+ prototyping board and current software version. Current lab assignment requires a 3-wire sweep of a PNP transistor using the attached instructions. I have tried both an MPS4126 and a 2N3905 but I get an error and only one set of datapoints when attempting the sweep. The prescribed setup worked fine for an NPN transistor, and multiple people have looked over my wiring and it's fine.

[StarSword-C · Accepted solution]

Solved the problem. Reducing the low end of the voltage to -5V fixed it.