Observe what happens to the trace and record it on your report sheet. This is the vertical distance from the lowest valley to the highest peak. On your report sheet, record your scale reading and calculate the signal amplitude. The lower the percent ripple, the better. On your report sheet, calculate the percent ripple for your DC supply.
Time is measured horizontally on the scope.
Count horizontal divisions between successive peaks on the waveform. Disconnect the scope from the power supply and connect it to the function generator. Set up the function generator to produce a 1,000 Hz sine wave by using the large frequency dial in combination with the range switches. The frequency will be the frequency dial setting multiplied by multiplier on the range switch. Set the function geneator output for maximum amplitude.