This is a very important step which you should always undertake with the calibrated calibrators. It simply involves amplitude and phase plots versus time which you make with UVPLT in the usual way (see § 7) remembering this time to set docalib=1 and gainuse=2 (say) to turn on the calibration and select a CL table. You should examine the plots to ensure that the phases are distributed about zero and that the amplitudes are distributed about the flux density that is now in the SU table (i.e., that which you set with SETJY or GETJY). If you had gain jumps, you can now see whether you did a good job of calibrating them out.
An alternative is to print out lots of numbers with LISTR in a matrix format. Set optyp='matx', select the desired sources with sources and freqid, turn on the calibration with docalib=1 and gainuse =2 to select CL table 2, select amplitude and phase for display with dparm(1)=5, and send the results to the line printer with docrt=-1 and GO LISTR. I think this is an awful way to look at your data, but those entrenched in old VLA DEC-10 habits will feel a warm glow.