Can you do frequency domain analysis in the lock-in amplifier?

Yes. The built-in oscilloscope can perform FFT at every probe point. The FFT feature can be accessed via the Math function. If a higher spectral resolution is required, we recommend switching to the spectrum analyzer instrument. Switching between instruments on Moku:Lab only takes up to a few seconds. Analyze the signal in the spectrum analyzer provides additional insights on the bandwidth of the signal. It helps the user to select an appropriate time constant for the measurement.