While measuring ripple on a 600v power supply, with the channel input set to AC and 100:1, there's a DC offset. I'm using an after market (TPI), 100:1 probe. I'm not getting the offset at 300 volts using the Agilent or the TPI probe. When I connect the TPI probe to my old "Tek" analog scope, there's no offset at 600v. To me it appears that there's a leaky coupling capacitor on the vertical input. Is there something wrong with my 3024? Is this something I should be concerned with?