The DC Offset Is Not What I Expect

The DC Offset Is Not What I Expect

If you are using a switchable 1x/10x scope probe, make sure it is on the proper setting. Also, make sure that the channel is configured for that setting. Note that the scope input impedance for the VB-8012 is 1 MΩ. On the VB-8034/8054, you can use the VirtualBench application to set the input impedance to either 50 Ω or 1 MΩ. If you are measuring signals with very high output impedance, there may be a voltage drop across that source impedance causing a voltage error. Make sure that the scope is not in AC coupled mode. It should be DC coupled when the DC component is important.