Cubbon guo

Hello,
     the instrument is not set for relative measurement. Because the current of the tested device fluctuates greatly, and may even exceed the range of the instrument, there will eventually be overflow. Can I send instructions to solve the problem that the data overflow causes the reading to become larger. Can you help me? thank you！

I'm a student working with the 6485 low-current test, continuous collection of 50 data, as long as there is an overflow, all the measurements will become large, if there is no overflow, 50 measurements are normal, why? Can someone help me?

I'm a student working with the 6485 for low current measurement, in a fixed range, the measurement of data overflow, after the reading is larger, may I ask why? Can you help me?thank you!