Differential attenuators

To increase the input range of a differential input, a special differential attenuator is required. For a differential input, both sides of the input need to be attenuated.

Schematic differential attenuator

Standard oscilloscope probes and attenuators only attenuate one side of the signal path. These are not suitable to be used with a differential input. Using these on a differential input will have a negative effect on the CMRR and will introduce measurement errors.

Single ended attenuator mismatch