The Rigol PA-DSA1030 built-in preamplifier is an option for the DSA1030 and the DSA1030-TG. It is standard on the DSA1030A and the DSA1030A-TG.
A preamplifier reduces the displayed average noise level giving better visibility of signals close to the noise floor. An icon will be displayed on the left of the screen when the preamplifier is on. The preamplifier will be disabled automatically when the input attenuation is set higher than 30dB.