I do nothing but the voltage on some of channels jumps back and forth more or less randomly as I see in Measurement dialog window. Definitely, when I change the current e.g. dragging one of the scroll bars, those voltages also react, although continue to behave strange. Why all these happens?
These usually happens when the voltage which you are looking at is not connected to anything (i.e. wires are just in the air). Check it out.
New: This may also happen when you have multi-channel system with rather large (>10kOhm) resistance in series with ADC input wires. I believe that this happens because electric potential which is present on ADC input capacitance can not change very fast when multiplexing takes place since this capacitance should re-charge via the above mentioned series resistance. The series resistance can be just a contact resistance of your circuit and will affect the measurements even if you measure using 4-contact technique.
Solution: Try to increase a delay after MUXing in Options | Delays.
See also: How does the averaging work?
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