My E3642A doesn't work well. When I look on the scope, at output voltages above 17.83, it shows a 120 Hz ripple, and the DC output voltage isn't very accurate. at lower voltages it is reasonably accurate. In addition, when I turn the knob to adjust the voltage, it jumps in steps of about 1.1 V in the display, not 1.0 as you would expect.
Before I tear it open and look at the transformer and caps, are there any suggestions for what to expect ? This unit was from the auction site and appears to have fallen on its front -- the front binding posts are damaged, but nothing else seems amiss. It can supply the rated currents.