What is the input impedance of a LabPro voltage probe?September 7, 20050 The input impedences of our voltage probes are all listed on in the LabPro Technical Reference Manual. For a normal VP-BTA voltage probe used with LabPro: Input impedance: +/-10V input 1MΩ Note that if one was to use a VP-DIN on a LabPro... Continue Reading →