I'm trying to determine if there is a problem with my power supply, or if the voltage and current readout just aren't accurate sometimes.
I've got the Rigol DP832 power supply and it has been great. But I used it to test an audio amplifier that I repaired, putting channels 1 and 2 in parallel for more current. The amplifier was amplifying a 35Hz sine wave. Even though I set the peak voltage to 14v and peak current to 3.2A, as the current demand of the amplifier approaches 3A/channel, the voltage starts sagging quite a bit. I had expected the voltage to remain constant until the peak current limit was reached. Is this expected for this power supply?
I attached a screen shot, notice the voltage and current limits at the bottom (smaller numbers), and the actual readings on top: