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Hello everyone, I am having some problems with a recently acquired HP infinium oscilloscope (500 MHz, 1 GSa/s, model 54815A). I was able to rung most of the self tests, and I received one FAILED statement that indicates the interpolator is not working. I am not able to see any type of signal/waveform and I was wondering what I can do to get to be able to see the waveform.. I cannot even get the zero-ed line to appear on the oscilloscope screen. I can give further details for those who are interested. Thanks to all for your help!