Example of a noise diode observation conducted prior to a pulsar observation with the NRT. The black line represents the total intensity, I, of the signal as a function of pulse phase (the noise diode signal is periodic, with a frequency of 3.33 Hz), and the red, magenta, and blue lines correspond respectively to the Q, U, and V Stokes parameters. Note that the I, Q, U, and V Stokes parameters are uncalibrated in this figure. The data were extracted from a 10-s observation of the noise diode with the NUPPI backend, conducted on MJD 59368 prior to an observation of PSR J0742−2822 at the central frequency of 1.484 GHz. The data shown in this figure were taken from the 46th 4-MHz channel recorded by NUPPI, corresponding to the frequency of 1.410 GHz.