Measurement instrument having time, frequency and logic domain channels

A measurement system for measuring signals from a device under test (DUT), the measurement system comprising:

• a time domain receiver for receiving from the DUT a DUT time domain output signal in a time domain and to provide a time domain input signal;
• a logic domain receiver for receiving from the DUT a DUT logic domain output signal comprising logic levels over time;
• a frequency domain receiver for receiving from the DUT a DUT frequency domain output signal in a frequency domain and to provide a frequency domain input signal;
• and
• a controller, coupled to the logic domain receiver, for determining control signals in response to the logic levels from the DUT logic domain output signal, wherein the control signals are provided to the frequency domain receiver for controlling at least one of an acquisition frequency or an amplitude of the frequency domain input signal.

A method for operating a multi-domain oscilloscope, comprising:

• receiving at the multi-domain oscilloscope a time domain input signal from a device under test (DUT) in a time domain channel, the time domain input signal being in a time domain;
• receiving at the multi-domain oscilloscope a frequency domain input signal in a frequency domain channel from the DUT through frequency down conversion of a frequency domain DUT signal having a variable center frequency, the frequency domain input signal being in a frequency domain;
• receiving at the multi-domain oscilloscope a logic level input signal in a logic domain channel from the DUT, the logic level input signal comprising logic levels indicating the variable center frequency of the frequency domain DUT signal at each instant over time;
• determining control signals in response to the logic levels of the logic level input signal;
• and
• controlling the frequency down conversion of the frequency domain DUT signal using the determined control signals to provide the frequency domain input signal in accordance with the variable center frequency.