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The low frequency (110--180 MHz) capabilities of the Westerbork SynthesisRadio Telescope (WSRT) are used to characterise a large collection of singlepulses from three low magnetic field pulsars. Using the Pulsar Machine II(PuMa-II) to acquire and coherently dedisperse the pulsar signals, we examinewhether the bright pulses observed in these pulsars are related to theclassical giant pulse emission. Giant pulses are reported from PSR B1112$+$50and bright pulses from the PSRs B1133$+$16 and B0031$-$07. These pulsars alsoexhibit large intensity modulations observed as rapid changes in the singlepulse intensity. Evidence of global magnetospheric effects is provided by ourdetection of bright double pulses in PSRs B0031$-$07 and B1133$+$16. Using themulti-frequency observations, we accurately determine the dispersion measures(4.844$\pm$0.002 for B1133$+$16 and 9.1750$\pm$0.0001 for B1112$+$50), derivethe radio emission height in PSR B1133$+$16 and report on the properties ofsubpulse drift modes in these pulsars. We also find that these pulsars show amuch larger intensity modulation at low sky frequencies resulting in narrow andbright emissions.

A low frequency study of PSRs B1133+16, B1112+50, and B0031-07