TDS3064B "ripple" on calibrator signal


Running an up-hacked TDS3014B, and am seeing small amount of what I'll call
"ripple" on the top of the calibrator signal (i.e. the 5V part of the signal
- the 0V end is relatively stable by comparison). By "ripple" I mean it's
dancing up and down quite slowly (2Hz?) by about 1/2 a trace width, and the
Ch1 Max value switches between 5.16V and 5.20V.

Has anyone here seen this sort of behaviour before?


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