I've recently acquired an HP8601A sweep generator with full manual. It appears to be in pretty good shape. A cursory inspection suggests everything is working about right, although I haven't run any calibration checks yet. Just one problem I can see so far. When I connect the RF output to the vertical input of my oscilloscope and set it to the CW function, I get a rather odd-shaped sine wave--not your usual well-shaped waveform but more like two connected U-shapes for each half-cycle. I'm guessing this is not normal and there's some sort of distortion being introduced in one of the oscillators or their amps or control circuits. Anyone have any experience with a problem like this or have a suggestion about what might be going on? Thanks in advance for any input.
